author | Oleksandr Gavenko <gavenkoa@gmail.com> |
Fri, 13 Dec 2019 00:16:26 +0200 | |
changeset 2397 | 320b2c43529b |
parent 2393 | 6f68472e27d9 |
child 2398 | ac2b5bc2f2c1 |
permissions | -rw-r--r-- |
1683 | 1 |
.. -*- coding: utf-8; -*- |
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========== |
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Postgres |
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========== |
6 |
.. contents:: |
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7 |
:local: |
1683 | 8 |
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9 |
Installing on Debian |
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==================== |
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12 |
Install and create new user and database:: |
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13 |
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14 |
$ sudo apt-get install postgresql postgresql-client |
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15 |
$ sudo su - postgres |
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% psql |
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postgres=# CREATE USER myuser WITH PASSWORD 'mypass'; |
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postgres=# CREATE DATABASE mydb OWNER myuser; |
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postgres=# \q |
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21 |
Connect as user ``mypguser`` to new database:: |
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$ su - mypguser |
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24 |
$ psql mypgdatabase |
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In order to create local host superuser:: |
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Create local host superuser.
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Create local host superuser.
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28 |
$ sudo su - postgres |
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Create local host superuser.
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$ createuser --superuser USER |
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Create local host superuser.
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30 |
$ exit |
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$ sudo -u USER psql |
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.. |
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35 |
https://wiki.debian.org/PostgreSql |
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Debian wiki instructions. |
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Check version |
39 |
============= |
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40 |
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41 |
By SQL query:: |
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SELECT version(); |
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SHOW server_version; |
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SHOW server_version_num; |
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From executable:: |
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$ postgres -V |
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Check locations |
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=============== |
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:: |
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SHOW hba_file; |
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SHOW config_file; |
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Check settings |
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============== |
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60 |
:: |
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SELECT name, setting FROM pg_settings; |
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SELECT name, current_setting(name), source FROM pg_settings; |
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Check extensions |
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================ |
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67 |
:: |
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SELECT * FROM pg_available_extensions; |
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Set application name |
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==================== |
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``application_name`` is displayed in ``pg_stat_activity.application_name``. |
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It can help identify clients of DB. To alter it in current session:: |
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SET application_name = 'some name'; |
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79 |
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To show current value:: |
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Set application name.
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parents:
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81 |
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SHOW application_name; |
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2338 | 84 |
Limitations |
85 |
=========== |
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86 |
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87 |
https://wiki.postgresql.org/wiki/TOAST |
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88 |
TOAST is a mechanism PostgreSQL uses to keep physical data rows from exceeding the size of a data |
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block (typically 8KB). |
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List privileges |
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parents:
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92 |
=============== |
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parents:
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List databases with privileges:: |
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parents:
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\l |
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List schemas with privileges:: |
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100 |
\dn+ |
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101 |
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102 |
List users with privileges:: |
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103 |
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104 |
\du |
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parents:
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105 |
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Revoke privileges and drop role.
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106 |
List privileges to objects (tables, views, sequences):: |
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Revoke privileges and drop role.
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parents:
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107 |
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\dp |
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109 |
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SELECT * FROM information_schema.role_table_grants |
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WHERE table_name = 'table_name'; |
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parents:
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112 |
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List default privileges.
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List default privileges:: |
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List default privileges.
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114 |
|
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List default privileges.
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\ddp |
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List default privileges.
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116 |
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List default privileges.
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SELECT * FROM pg_default_acl; |
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List default privileges.
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118 |
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Grant role options.
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119 |
Grant role options |
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120 |
================== |
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121 |
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122 |
Show role options and group membership:: |
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parents:
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123 |
|
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124 |
\du |
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Revoke role options.
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parents:
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125 |
|
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126 |
Grant role options:: |
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127 |
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ALTER USER me WITH SUPERUSER; |
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129 |
ALTER USER me WITH CREATEDB CREATEROLE LOGIN; |
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130 |
|
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131 |
Revoke role options:: |
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parents:
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132 |
|
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parents:
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133 |
ALTER USER me WITH NOSUPERUSER; |
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134 |
|
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135 |
https://www.postgresql.org/docs/current/sql-createrole.html |
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136 |
``CREATE ROLE``. |
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137 |
|
2373 | 138 |
Granting selects:: |
139 |
||
2375 | 140 |
GRANT SELECT ON ALL TABLES IN SCHEMA public TO ro_user; |
141 |
GRANT SELECT, INSERT, UPDATE, DELETE ON ALL TABLES IN SCHEMA public TO rw_user; |
|
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parents:
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GRANT USAGE ON ALL SEQUENCES IN SCHEMA public TO rw_user; |
2373 | 143 |
|
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Making read-only role.
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144 |
Making read-only role:: |
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Making read-only role.
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parents:
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145 |
|
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Making read-only role.
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146 |
GRANT CONNECT ON DATABASE mydb TO ro; |
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Making read-only role.
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GRANT USAGE ON SCHEMA myschema TO ro; |
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GRANT SELECT ON TABLE myschema.myt1, myschema.myt2 TO ro; |
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149 |
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Granting default privileges for new objects:: |
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151 |
|
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152 |
ALTER DEFAULT PRIVILEGES IN SCHEMA myschema GRANT SELECT, INSERT, UPDATE, DELETE ON TABLES TO rw_user; |
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Largest index. Table size.
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ALTER DEFAULT PRIVILEGES IN SCHEMA myschema GRANT ALL ON SEQUENCES TO rw_user; |
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154 |
ALTER DEFAULT PRIVILEGES IN SCHEMA myschema GRANT EXECUTE ON FUNCTIONS TO rw_user; |
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155 |
|
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parents:
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156 |
Revoke privileges and drop role |
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parents:
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157 |
=============================== |
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parents:
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158 |
|
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parents:
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159 |
List roles:: |
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Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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160 |
|
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parents:
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161 |
SELECT * FROM pg_roles; |
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parents:
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162 |
|
2378 | 163 |
SELECT oid, rolname FROM pg_roles |
164 |
WHERE pg_has_role('xuser', oid, 'member'); |
|
165 |
||
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parents:
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166 |
Revoke privileges:: |
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Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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167 |
|
20b65f046002
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parents:
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168 |
REVOKE ALL PRIVILEGES ON DATABASE mydb FROM xuser; |
20b65f046002
Revoke privileges and drop role.
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parents:
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169 |
REVOKE ALL PRIVILEGES ON SCHEMA myschem FROM xuser; |
20b65f046002
Revoke privileges and drop role.
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parents:
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170 |
REVOKE ALL PRIVILEGES ON ALL TABLES IN SCHEMA myschem FROM xuser; |
20b65f046002
Revoke privileges and drop role.
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parents:
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171 |
REVOKE ALL PRIVILEGES ON ALL SEQUENCES IN SCHEMA myschem FROM xuser; |
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parents:
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172 |
|
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parents:
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173 |
do $$ |
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parents:
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174 |
DECLARE r record; |
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parents:
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175 |
begin |
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176 |
for r in select * from pg_views where schemaname = 'myschem' |
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parents:
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177 |
loop |
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178 |
execute 'revoke all on ' || quote_ident(r.schemaname) ||'.'|| quote_ident(r.viewname) || ' from "xuser"'; |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
179 |
end loop; |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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diff
changeset
|
180 |
end $$; |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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diff
changeset
|
181 |
|
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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diff
changeset
|
182 |
To forbid any operations (read/write) without dealing with individual privileges (any pending user |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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diff
changeset
|
183 |
transactions will fail!):: |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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diff
changeset
|
184 |
|
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
185 |
REVOKE USAGE ON SCHEMA myschem FROM xuser; |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
186 |
|
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
187 |
To forbid connection remove privilege from ``public`` role as it inherited by all users and then from user:: |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
188 |
|
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
189 |
REVOKE CONNECT ON DATABASE mydb FROM public; |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
190 |
REVOKE CONNECT ON DATABASE mydb FROM xuser; |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
191 |
|
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
192 |
Role can't be dropped until it owns objects, need to reassign owner:: |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
193 |
|
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
194 |
REASSIGN OWNED BY xuser TO myuser; |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
195 |
|
2377 | 196 |
Some objects may left behind role (like default privileges), they can be dropped via:: |
197 |
||
198 |
DROP OWNED BY xuser; |
|
199 |
||
2376
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
200 |
Remove role:: |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
201 |
|
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
202 |
DROP ROLE xuser; |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
203 |
|
2329
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
204 |
Change password |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
205 |
=============== |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
206 |
:: |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
207 |
|
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
208 |
ALTER USER me WITH PASSWORD 'PassWord'; |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
209 |
|
2330
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
210 |
Monitor connections |
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
211 |
=================== |
2378 | 212 |
|
213 |
Current user:: |
|
214 |
||
215 |
SELECT current_user; |
|
216 |
SELECT session_user; |
|
217 |
||
2391
aedbd074ec54
Added extra examples of queries.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2388
diff
changeset
|
218 |
Active sessions and queries:: |
aedbd074ec54
Added extra examples of queries.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2388
diff
changeset
|
219 |
|
aedbd074ec54
Added extra examples of queries.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2388
diff
changeset
|
220 |
select * from pg_stat_activity; |
2330
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
221 |
|
2391
aedbd074ec54
Added extra examples of queries.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2388
diff
changeset
|
222 |
select * from pg_stat_activity |
aedbd074ec54
Added extra examples of queries.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2388
diff
changeset
|
223 |
order by usename; |
aedbd074ec54
Added extra examples of queries.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2388
diff
changeset
|
224 |
|
2330
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
225 |
|
2333
3a371f973644
The Statistics Collector.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2332
diff
changeset
|
226 |
https://www.postgresql.org/docs/current/monitoring-stats.html |
3a371f973644
The Statistics Collector.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2332
diff
changeset
|
227 |
The Statistics Collector. |
3a371f973644
The Statistics Collector.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2332
diff
changeset
|
228 |
|
2331 | 229 |
Profile queries |
230 |
=============== |
|
231 |
||
232 |
Stats on query execution time:: |
|
233 |
||
234 |
SELECT * FROM pg_stat_statements; |
|
235 |
||
2393 | 236 |
SELECT * FROM pg_stat_statements |
237 |
ORDER BY calls DESC; |
|
238 |
||
239 |
SELECT * FROM pg_stat_statements |
|
240 |
WHERE query LIKE '%some%' |
|
241 |
ORDER BY calls DESC; |
|
242 |
||
2331 | 243 |
https://www.postgresql.org/docs/current/pgstatstatements.html |
244 |
``pg_stat_statements``. |
|
245 |
https://www.postgresql.org/docs/current/indexes-examine.html |
|
246 |
Examining Index Usage. |
|
247 |
||
2298
34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
changeset
|
248 |
List databases, schemas and tables |
34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
changeset
|
249 |
================================== |
1701
6163ba5907d4
To switch databases.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1700
diff
changeset
|
250 |
|
6163ba5907d4
To switch databases.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1700
diff
changeset
|
251 |
Default database is ``postgres``. |
6163ba5907d4
To switch databases.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1700
diff
changeset
|
252 |
|
1709
f34c6bc973cb
Create local host superuser.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1708
diff
changeset
|
253 |
To list databases and database locales:: |
1701
6163ba5907d4
To switch databases.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1700
diff
changeset
|
254 |
|
1702 | 255 |
$ psql -U pgadmin -l |
256 |
||
257 |
or:: |
|
258 |
||
259 |
=> SELECT datname FROM pg_database WHERE datistemplate = false; |
|
1701
6163ba5907d4
To switch databases.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1700
diff
changeset
|
260 |
=> \l |
6163ba5907d4
To switch databases.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1700
diff
changeset
|
261 |
|
6163ba5907d4
To switch databases.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1700
diff
changeset
|
262 |
To switch databases:: |
6163ba5907d4
To switch databases.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1700
diff
changeset
|
263 |
|
6163ba5907d4
To switch databases.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1700
diff
changeset
|
264 |
=> \connect NAME |
1684 | 265 |
|
266 |
Schemas:: |
|
267 |
||
2328 | 268 |
\dn * |
269 |
select schema_name from information_schema.schemata; |
|
270 |
select nspname from pg_catalog.pg_namespace; |
|
1684 | 271 |
|
1701
6163ba5907d4
To switch databases.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1700
diff
changeset
|
272 |
To list all tables in the current database:: |
6163ba5907d4
To switch databases.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1700
diff
changeset
|
273 |
|
2328 | 274 |
\dt |
275 |
SELECT table_schema, table_name FROM information_schema.tables ORDER BY table_schema, table_name; |
|
2391
aedbd074ec54
Added extra examples of queries.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2388
diff
changeset
|
276 |
SELECT * FROM pg_class; |
1701
6163ba5907d4
To switch databases.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1700
diff
changeset
|
277 |
|
2300
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
278 |
or in all schemas:: |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
279 |
|
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
280 |
=> \dt *.* |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
281 |
|
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
282 |
List views:: |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
283 |
|
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
284 |
\dv |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
285 |
|
2298
34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
changeset
|
286 |
List users:: |
34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
changeset
|
287 |
|
34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
changeset
|
288 |
\du |
2299 | 289 |
\du+ |
290 |
||
2300
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
291 |
List schemas:: |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
292 |
|
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
293 |
\dn |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
294 |
|
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
295 |
List indexes:: |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
296 |
|
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
297 |
\di |
2328 | 298 |
select * from pg_indexes; |
299 |
select * from pg_indexes where schemaname = '...'; |
|
300 |
select * from pg_indexes where schemaname = '...' and tablename = '...'; |
|
301 |
select * from pg_indexes where schemaname = '...' and indexname = '...'; |
|
2300
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
302 |
|
2329
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
303 |
select |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
304 |
t.relname as table_name, |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
305 |
i.relname as index_name, |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
306 |
a.attname as column_name |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
307 |
from |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
308 |
pg_class t, |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
309 |
pg_class i, |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
310 |
pg_index ix, |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
311 |
pg_attribute a |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
312 |
where |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
313 |
t.oid = ix.indrelid |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
314 |
and i.oid = ix.indexrelid |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
315 |
and a.attrelid = t.oid |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
316 |
and a.attnum = ANY(ix.indkey) |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
317 |
and t.relkind = 'r' |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
318 |
and t.relname like 'test%' |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
319 |
order by |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
320 |
t.relname, |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
321 |
i.relname; |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
322 |
|
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
323 |
select |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
324 |
t.relname as table_name, |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
325 |
i.relname as index_name, |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
326 |
array_to_string(array_agg(a.attname), ', ') as column_names |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
327 |
from |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
328 |
pg_class t, |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
329 |
pg_class i, |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
330 |
pg_index ix, |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
331 |
pg_attribute a |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
332 |
where |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
333 |
t.oid = ix.indrelid |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
334 |
and i.oid = ix.indexrelid |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
335 |
and a.attrelid = t.oid |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
336 |
and a.attnum = ANY(ix.indkey) |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
337 |
and t.relkind = 'r' |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
338 |
and t.relname like 'test%' |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
339 |
group by |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
340 |
t.relname, |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
341 |
i.relname |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
342 |
order by |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
343 |
t.relname, |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
344 |
i.relname; |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
345 |
|
2330
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
346 |
List index usage:: |
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
347 |
|
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
348 |
SELECT * FROM pg_stat_all_indexes; |
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
349 |
SELECT * FROM pg_stat_all_tables; |
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
350 |
SELECT * FROM pg_stat_user_indexes; |
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
351 |
SELECT * FROM pg_stat_user_tables; |
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
352 |
|
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
353 |
List constraints:: |
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
354 |
|
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
355 |
SELECT * FROM pg_constraint; |
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
356 |
SELECT * FROM pg_constraint WHERE conrelid = (SELECT oid FROM pg_class WHERE relname LIKE 'tblName'); |
2337 | 357 |
select * from pg_constraint where conname like '%conName%'; |
2330
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
358 |
|
2373 | 359 |
Show constraints and columns to given table:: |
360 |
||
361 |
select |
|
362 |
c.constraint_name, |
|
363 |
x.table_schema as schema_name, x.table_name, x.column_name, |
|
364 |
y.table_schema as foreign_schema_name, y.table_name as foreign_table_name, y.column_name as foreign_column_name |
|
365 |
from information_schema.referential_constraints c |
|
366 |
join information_schema.key_column_usage x |
|
367 |
on x.constraint_name = c.constraint_name |
|
368 |
join information_schema.key_column_usage y |
|
369 |
on y.ordinal_position = x.position_in_unique_constraint |
|
370 |
and y.constraint_name = c.unique_constraint_name |
|
371 |
where y.table_name = 'sa_pnr' |
|
372 |
order by c.constraint_name, x.ordinal_position |
|
373 |
||
2330
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
374 |
https://www.postgresql.org/docs/current/catalog-pg-constraint.html |
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
375 |
pg_constraint. |
2373 | 376 |
https://stackoverflow.com/questions/1152260/postgres-sql-to-list-table-foreign-keys |
377 |
List table foreign keys. |
|
2330
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
378 |
|
2300
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
379 |
List functions:: |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
380 |
|
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
381 |
\df |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
382 |
|
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
383 |
List triggers:: |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
384 |
|
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
385 |
\dy |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
386 |
|
2299 | 387 |
List misc info:: |
388 |
||
389 |
select current_database(); |
|
390 |
select current_schema(); |
|
391 |
select current_user; |
|
392 |
select session_user; |
|
393 |
select current_date; |
|
394 |
select version(); |
|
395 |
||
396 |
https://www.postgresql.org/docs/current/functions-info.html |
|
397 |
System Information Functions. |
|
2298
34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
changeset
|
398 |
|
1703
a85cc266dbdf
Set default schema.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1702
diff
changeset
|
399 |
Set default schema. |
a85cc266dbdf
Set default schema.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1702
diff
changeset
|
400 |
=================== |
a85cc266dbdf
Set default schema.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1702
diff
changeset
|
401 |
:: |
a85cc266dbdf
Set default schema.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1702
diff
changeset
|
402 |
|
a85cc266dbdf
Set default schema.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1702
diff
changeset
|
403 |
set search_path to NAME; |
2298
34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
changeset
|
404 |
set schema 'NAME'; |
1703
a85cc266dbdf
Set default schema.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1702
diff
changeset
|
405 |
|
2298
34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
changeset
|
406 |
Database, table, index size |
34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
changeset
|
407 |
=========================== |
1710
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
408 |
|
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
409 |
Database size:: |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
410 |
|
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
411 |
SELECT pg_database_size('geekdb'); -- in bytes |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
412 |
SELECT pg_size_pretty(pg_database_size('dbname')); |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
413 |
|
2338 | 414 |
SELECT datname, pg_database_size(datname) FROM pg_database; |
415 |
||
1710
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
416 |
List of databases sizes:: |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
417 |
|
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
418 |
\l+ |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
419 |
|
2381
b26d26c54b05
Largest index. Table size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2380
diff
changeset
|
420 |
SELECT pg_database_size('mydb'); |
b26d26c54b05
Largest index. Table size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2380
diff
changeset
|
421 |
|
2373 | 422 |
List tables sizes (and constraints):: |
1711 | 423 |
|
424 |
\d+ |
|
425 |
||
1710
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
426 |
Table total size (with indexes):: |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
427 |
|
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
428 |
SELECT pg_size_pretty(pg_total_relation_size('schemaname.tablename')); |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
429 |
|
2381
b26d26c54b05
Largest index. Table size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2380
diff
changeset
|
430 |
Table size with TOAST (without indexes):: |
b26d26c54b05
Largest index. Table size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2380
diff
changeset
|
431 |
|
b26d26c54b05
Largest index. Table size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2380
diff
changeset
|
432 |
SELECT pg_table_size('schemaname.tablename'); |
b26d26c54b05
Largest index. Table size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2380
diff
changeset
|
433 |
|
1710
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
434 |
Sole table size (without indexes and other):: |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
435 |
|
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
436 |
SELECT pg_size_pretty(pg_relation_size('schemaname.tablename')); |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
437 |
|
2381
b26d26c54b05
Largest index. Table size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2380
diff
changeset
|
438 |
SELECT pg_relation_size(t.schemaname ||'.'|| t.tablename), t.* FROM pg_tables t; |
b26d26c54b05
Largest index. Table size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2380
diff
changeset
|
439 |
|
1710
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
440 |
Largest table in the PostgreSQL database:: |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
441 |
|
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
442 |
SELECT relname, relpages FROM pg_class ORDER BY relpages DESC; |
2339
cb96d35c46cf
Largest tables with TOAST.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2338
diff
changeset
|
443 |
SELECT relname, pg_size_pretty(pg_relation_size(p.oid)) FROM pg_class ORDER BY relpages DESC; |
cb96d35c46cf
Largest tables with TOAST.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2338
diff
changeset
|
444 |
|
cb96d35c46cf
Largest tables with TOAST.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2338
diff
changeset
|
445 |
Largest tables with TOAST:: |
cb96d35c46cf
Largest tables with TOAST.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2338
diff
changeset
|
446 |
|
cb96d35c46cf
Largest tables with TOAST.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2338
diff
changeset
|
447 |
SELECT p.relname, t.relname, pg_size_pretty(pg_relation_size(p.oid)), p.relpages |
cb96d35c46cf
Largest tables with TOAST.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2338
diff
changeset
|
448 |
FROM pg_class p |
cb96d35c46cf
Largest tables with TOAST.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2338
diff
changeset
|
449 |
LEFT JOIN pg_class t ON t.reltoastrelid = p.oid |
cb96d35c46cf
Largest tables with TOAST.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2338
diff
changeset
|
450 |
ORDER BY p.relpages DESC; |
1710
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
451 |
|
2373 | 452 |
Largest TOAST:: |
453 |
||
454 |
select tbl.relname, toast.relname, toast.relpages |
|
455 |
from pg_class tbl, pg_class toast |
|
456 |
where tbl.reltoastrelid = toast.oid |
|
457 |
order by toast.relpages desc; |
|
458 |
||
2343 | 459 |
Size of types:: |
460 |
||
461 |
SELECT pg_column_size(5::smallint); |
|
462 |
SELECT pg_column_size(5::int); |
|
463 |
SELECT pg_column_size(5::bigint); |
|
464 |
||
2383 | 465 |
Index size:: |
466 |
||
467 |
SELECT pg_indexes_size('my_ix'); |
|
468 |
||
2381
b26d26c54b05
Largest index. Table size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2380
diff
changeset
|
469 |
Largest index:: |
b26d26c54b05
Largest index. Table size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2380
diff
changeset
|
470 |
|
b26d26c54b05
Largest index. Table size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2380
diff
changeset
|
471 |
select pg_relation_size(oid), * from pg_class |
b26d26c54b05
Largest index. Table size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2380
diff
changeset
|
472 |
where relkind = 'i' |
b26d26c54b05
Largest index. Table size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2380
diff
changeset
|
473 |
order by pg_relation_size(oid) desc; |
b26d26c54b05
Largest index. Table size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2380
diff
changeset
|
474 |
|
2382 | 475 |
select pg_relation_size(i.oid), t.relname as tname, i.relname as iname, * |
476 |
from pg_class i |
|
477 |
join pg_index ix on ix.indexrelid = i.oid |
|
478 |
join pg_class t on t.oid = ix.indrelid |
|
479 |
where i.relkind = 'i' |
|
480 |
order by pg_relation_size(i.oid) desc; |
|
481 |
||
2381
b26d26c54b05
Largest index. Table size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2380
diff
changeset
|
482 |
https://www.postgresql.org/docs/9.6/functions-admin.html |
b26d26c54b05
Largest index. Table size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2380
diff
changeset
|
483 |
Database Object Management Functions. |
2343 | 484 |
https://wiki.postgresql.org/wiki/Disk_Usage |
2382 | 485 |
Finding the size of various object in your database. |
486 |
https://wiki.postgresql.org/wiki/Index_Maintenance |
|
487 |
Index size/usage statistics. |
|
2343 | 488 |
|
2327
24ffd84a171c
MVCC and transaction id.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2326
diff
changeset
|
489 |
MVCC and transaction id |
24ffd84a171c
MVCC and transaction id.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2326
diff
changeset
|
490 |
======================= |
24ffd84a171c
MVCC and transaction id.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2326
diff
changeset
|
491 |
|
24ffd84a171c
MVCC and transaction id.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2326
diff
changeset
|
492 |
As being MVCC Postgres doesn't delete or update existing rows. Row visibility is controled by |
24ffd84a171c
MVCC and transaction id.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2326
diff
changeset
|
493 |
transaction id (monotonous incremented number): ``xmin`` - first transaction that can see row, |
2386 | 494 |
``xmax`` - last transaction that can see row:: |
2327
24ffd84a171c
MVCC and transaction id.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2326
diff
changeset
|
495 |
|
24ffd84a171c
MVCC and transaction id.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2326
diff
changeset
|
496 |
SELECT xmin, xmax, * FROM foo WHERE id < 5 ORDER BY id; |
24ffd84a171c
MVCC and transaction id.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2326
diff
changeset
|
497 |
|
2328 | 498 |
Vacuum |
499 |
====== |
|
500 |
||
501 |
Stats on vacuum oprtations per table:: |
|
502 |
||
503 |
select * from pg_stat_user_tables; |
|
504 |
||
2373 | 505 |
Table statistics |
506 |
================ |
|
507 |
||
508 |
Full table statistics is in ``pg_statistics`` table which is accessible only by superuser. |
|
509 |
||
510 |
Human readable stats are in ``pg_stats`` view. |
|
511 |
||
2300
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
512 |
Using psql client |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
513 |
================= |
1700 | 514 |
|
515 |
Using password file ``~/.pgpass``:: |
|
516 |
||
517 |
# comment |
|
518 |
hostname:port:database:username:password |
|
519 |
hostname:port:*:username:password |
|
520 |
hostname:*:*:username:password |
|
521 |
||
522 |
Connect by:: |
|
523 |
||
2373 | 524 |
$ psql -U $USER -h $HOST -p $PORT $SCHEMA |
1700 | 525 |
|
2388 | 526 |
Switch to long lines format:: |
527 |
||
528 |
\x |
|
529 |
||
1710
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
530 |
How to view execution plan:: |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
531 |
|
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
532 |
EXPLAIN query; |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
533 |
EXPLAIN ANALYZE query; |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
534 |
|
2300
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
535 |
Collect statistics:: |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
536 |
|
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
537 |
ANALYZE table; |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
538 |
|
1710
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
539 |
How to redirect the output of query to a file:: |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
540 |
|
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
541 |
\o output_file |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
542 |
SELECT * FROM pg_class; |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
543 |
|
2298
34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
changeset
|
544 |
Switch database:: |
34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
changeset
|
545 |
|
34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
changeset
|
546 |
\connect DBNAME |
34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
changeset
|
547 |
\c DBNAME |
34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
changeset
|
548 |
|
2300
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
549 |
Load external SQL file:: |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
550 |
|
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
551 |
\i my.sql |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
552 |
|
2387
eede82d48288
Execute external file.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2386
diff
changeset
|
553 |
Execute external file:: |
eede82d48288
Execute external file.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2386
diff
changeset
|
554 |
|
eede82d48288
Execute external file.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2386
diff
changeset
|
555 |
psql -f my.sql |
eede82d48288
Execute external file.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2386
diff
changeset
|
556 |
|
2300
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
557 |
Export data |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
558 |
=========== |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
559 |
|
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
560 |
Export from ``psql``:: |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
561 |
|
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
562 |
\copy (SELECT * FROM foo) TO '/tmp/my.csv' WITH CSV |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
563 |
|
2305 | 564 |
Import data |
565 |
=========== |
|
566 |
||
567 |
Import CSV file:: |
|
568 |
||
569 |
\copy tbl_name from 'my.csv' csv; |
|
570 |
\copy tbl_name from 'my.csv' delimiter ':' csv; |
|
571 |
||
572 |
$ psql -U $USER -h $HOST $DB -c "\\copy tbl_name from 'my.csv' csv" |
|
573 |
||
2326 | 574 |
JDBC driver |
575 |
=========== |
|
576 |
||
577 |
https://jdbc.postgresql.org/about/about.html |
|
578 |
The current version of the driver should be compatible with PostgreSQL 8.2 and higher, and Java 6 |
|
579 |
(JDBC 4.0), Java 7 (JDBC 4.1), Java 8 (JDBC 4.2) and Java 9. |
|
580 |
https://jdbc.postgresql.org/download.html |
|
581 |
Java/JDBC/Postgres compatibility table. |
|
582 |
||
2332 | 583 |
plpgsql |
584 |
======= |
|
585 |
||
586 |
Simple function:: |
|
587 |
||
588 |
CREATE OR REPLACE FUNCTION incx(x INTEGER) |
|
589 |
RETURNS INTEGER STABLE AS $$ |
|
590 |
BEGIN |
|
591 |
RETURN x + 1; |
|
592 |
END; |
|
593 |
$$ LANGUAGE plpgsql; |
|
594 |
||
595 |
Support for procedures is added only in Postgres v11. |
|
596 |
||
597 |
https://www.postgresql.org/docs/current/sql-createfunction.html |
|
598 |
``CREATE FUNCTION``. |
|
599 |
https://www.postgresql.org/docs/current/plpgsql-control-structures.html |
|
600 |
plpgsql control structures. |
|
601 |
https://www.postgresql.org/docs/current/errcodes-appendix.html |
|
2376
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
602 |
PostgreSQL Error Codes. |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
603 |
|
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
604 |
Anonymous block:: |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
605 |
|
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
606 |
do $$ |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
607 |
begin |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
608 |
null; |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
609 |
end $$; |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
610 |
|
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
611 |
You cannot perform ``select`` without assigning resultset, special keyword ``perform`` is used |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
612 |
insted of ``select`` in PLPQGSL:: |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
613 |
|
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
614 |
do $$ |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
615 |
begin |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
616 |
perform 1 union all select 2; |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
617 |
end$$; |
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
618 |
|
20b65f046002
Revoke privileges and drop role.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2375
diff
changeset
|
619 |