author | Oleksandr Gavenko <gavenkoa@gmail.com> |
Thu, 03 Jan 2019 22:03:33 +0200 | |
changeset 2332 | fc34d7c084ba |
parent 2331 | 32dd4ce8e9b2 |
child 2333 | 3a371f973644 |
permissions | -rw-r--r-- |
1683 | 1 |
.. -*- coding: utf-8; -*- |
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========== |
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Postgres |
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========== |
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.. contents:: |
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7 |
:local: |
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9 |
Installing on Debian |
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==================== |
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Install and create new user and database:: |
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$ sudo apt-get install postgresql postgresql-client |
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$ 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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Connect as user ``mypguser`` to new database:: |
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$ su - mypguser |
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$ 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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27 |
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28 |
$ sudo su - postgres |
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$ createuser --superuser USER |
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$ 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 |
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============= |
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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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:: |
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SELECT name, setting FROM pg_settings; |
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Check extensions |
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================ |
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:: |
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SELECT * FROM pg_available_extensions; |
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Grant role options |
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================== |
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:: |
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73 |
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ALTER USER me WITH SUPERUSER; |
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ALTER USER me WITH CREATEDB CREATEROLE LOGIN; |
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https://www.postgresql.org/docs/current/sql-createrole.html |
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78 |
``CREATE ROLE``. |
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79 |
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80 |
Change password |
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81 |
=============== |
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:: |
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83 |
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ALTER USER me WITH PASSWORD 'PassWord'; |
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85 |
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86 |
Monitor connections |
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87 |
=================== |
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88 |
:: |
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List indexes/constraints.
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89 |
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List indexes/constraints.
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select * from pg_stat_activity; |
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2331 | 92 |
Profile queries |
93 |
=============== |
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Stats on query execution time:: |
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SELECT * FROM pg_stat_statements; |
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https://www.postgresql.org/docs/current/pgstatstatements.html |
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``pg_stat_statements``. |
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https://www.postgresql.org/docs/current/indexes-examine.html |
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102 |
Examining Index Usage. |
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103 |
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104 |
List databases, schemas and tables |
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105 |
================================== |
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106 |
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To switch databases.
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107 |
Default database is ``postgres``. |
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108 |
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Create local host superuser.
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To list databases and database locales:: |
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1702 | 111 |
$ psql -U pgadmin -l |
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or:: |
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=> SELECT datname FROM pg_database WHERE datistemplate = false; |
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=> \l |
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To switch databases.
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117 |
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To switch databases.
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118 |
To switch databases:: |
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To switch databases.
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119 |
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To switch databases.
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=> \connect NAME |
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Schemas:: |
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\dn * |
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select schema_name from information_schema.schemata; |
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select nspname from pg_catalog.pg_namespace; |
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To list all tables in the current database:: |
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To switch databases.
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129 |
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2328 | 130 |
\dt |
131 |
SELECT table_schema, table_name FROM information_schema.tables ORDER BY table_schema, table_name; |
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132 |
|
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Export data. Load external SQL file. List schemas/indexes/etc.
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133 |
or in all schemas:: |
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134 |
|
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135 |
=> \dt *.* |
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136 |
|
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137 |
List views:: |
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138 |
|
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139 |
\dv |
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140 |
|
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141 |
List users:: |
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142 |
|
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143 |
\du |
2299 | 144 |
\du+ |
145 |
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146 |
List schemas:: |
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147 |
|
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148 |
\dn |
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149 |
|
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Export data. Load external SQL file. List schemas/indexes/etc.
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150 |
List indexes:: |
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Export data. Load external SQL file. List schemas/indexes/etc.
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|
151 |
|
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152 |
\di |
2328 | 153 |
select * from pg_indexes; |
154 |
select * from pg_indexes where schemaname = '...'; |
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155 |
select * from pg_indexes where schemaname = '...' and tablename = '...'; |
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156 |
select * from pg_indexes where schemaname = '...' and indexname = '...'; |
|
2300
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Export data. Load external SQL file. List schemas/indexes/etc.
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157 |
|
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158 |
select |
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159 |
t.relname as table_name, |
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160 |
i.relname as index_name, |
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161 |
a.attname as column_name |
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162 |
from |
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163 |
pg_class t, |
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164 |
pg_class i, |
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165 |
pg_index ix, |
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166 |
pg_attribute a |
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167 |
where |
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168 |
t.oid = ix.indrelid |
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169 |
and i.oid = ix.indexrelid |
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170 |
and a.attrelid = t.oid |
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171 |
and a.attnum = ANY(ix.indkey) |
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172 |
and t.relkind = 'r' |
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173 |
and t.relname like 'test%' |
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|
174 |
order by |
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175 |
t.relname, |
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176 |
i.relname; |
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|
177 |
|
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|
178 |
select |
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179 |
t.relname as table_name, |
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|
180 |
i.relname as index_name, |
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|
181 |
array_to_string(array_agg(a.attname), ', ') as column_names |
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182 |
from |
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183 |
pg_class t, |
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184 |
pg_class i, |
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185 |
pg_index ix, |
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186 |
pg_attribute a |
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|
187 |
where |
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188 |
t.oid = ix.indrelid |
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changeset
|
189 |
and i.oid = ix.indexrelid |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
190 |
and a.attrelid = t.oid |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
191 |
and a.attnum = ANY(ix.indkey) |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
192 |
and t.relkind = 'r' |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
193 |
and t.relname like 'test%' |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
194 |
group by |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
195 |
t.relname, |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
196 |
i.relname |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
197 |
order by |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
198 |
t.relname, |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
199 |
i.relname; |
738316fb865f
Grant role options.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2328
diff
changeset
|
200 |
|
2330
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
201 |
List index usage:: |
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
202 |
|
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
203 |
SELECT * FROM pg_stat_all_indexes; |
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
204 |
SELECT * FROM pg_stat_all_tables; |
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
205 |
SELECT * FROM pg_stat_user_indexes; |
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
206 |
SELECT * FROM pg_stat_user_tables; |
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
207 |
|
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
208 |
List constraints:: |
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
209 |
|
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
210 |
SELECT * FROM pg_constraint; |
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
211 |
SELECT * FROM pg_constraint WHERE conrelid = (SELECT oid FROM pg_class WHERE relname LIKE 'tblName'); |
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
212 |
|
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
213 |
https://www.postgresql.org/docs/current/catalog-pg-constraint.html |
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
214 |
pg_constraint. |
03d20db65d79
List indexes/constraints.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2329
diff
changeset
|
215 |
|
2300
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
216 |
List functions:: |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
217 |
|
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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diff
changeset
|
218 |
\df |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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diff
changeset
|
219 |
|
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
220 |
List triggers:: |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
221 |
|
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
222 |
\dy |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
223 |
|
2299 | 224 |
List misc info:: |
225 |
||
226 |
select current_database(); |
|
227 |
select current_schema(); |
|
228 |
select current_user; |
|
229 |
select session_user; |
|
230 |
select current_date; |
|
231 |
select version(); |
|
232 |
||
233 |
https://www.postgresql.org/docs/current/functions-info.html |
|
234 |
System Information Functions. |
|
2298
34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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diff
changeset
|
235 |
|
1703
a85cc266dbdf
Set default schema.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1702
diff
changeset
|
236 |
Set default schema. |
a85cc266dbdf
Set default schema.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1702
diff
changeset
|
237 |
=================== |
a85cc266dbdf
Set default schema.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1702
diff
changeset
|
238 |
:: |
a85cc266dbdf
Set default schema.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1702
diff
changeset
|
239 |
|
a85cc266dbdf
Set default schema.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1702
diff
changeset
|
240 |
set search_path to NAME; |
2298
34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
changeset
|
241 |
set schema 'NAME'; |
1703
a85cc266dbdf
Set default schema.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1702
diff
changeset
|
242 |
|
2298
34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
changeset
|
243 |
Database, table, index size |
34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
changeset
|
244 |
=========================== |
1710
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
245 |
|
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
246 |
Database size:: |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
247 |
|
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
248 |
SELECT pg_database_size('geekdb'); -- in bytes |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
249 |
SELECT pg_size_pretty(pg_database_size('dbname')); |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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diff
changeset
|
250 |
|
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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diff
changeset
|
251 |
List of databases sizes:: |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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diff
changeset
|
252 |
|
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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diff
changeset
|
253 |
\l+ |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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diff
changeset
|
254 |
|
1711 | 255 |
List tables sizes:: |
256 |
||
257 |
\d+ |
|
258 |
||
1710
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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diff
changeset
|
259 |
Table total size (with indexes):: |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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diff
changeset
|
260 |
|
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
261 |
SELECT pg_size_pretty(pg_total_relation_size('schemaname.tablename')); |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
262 |
|
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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diff
changeset
|
263 |
Sole table size (without indexes and other):: |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
264 |
|
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
265 |
SELECT pg_size_pretty(pg_relation_size('schemaname.tablename')); |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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diff
changeset
|
266 |
|
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
267 |
Largest table in the PostgreSQL database:: |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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diff
changeset
|
268 |
|
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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diff
changeset
|
269 |
SELECT relname, relpages FROM pg_class ORDER BY relpages DESC; |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
270 |
|
2327
24ffd84a171c
MVCC and transaction id.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2326
diff
changeset
|
271 |
MVCC and transaction id |
24ffd84a171c
MVCC and transaction id.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2326
diff
changeset
|
272 |
======================= |
24ffd84a171c
MVCC and transaction id.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2326
diff
changeset
|
273 |
|
24ffd84a171c
MVCC and transaction id.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2326
diff
changeset
|
274 |
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
|
275 |
transaction id (monotonous incremented number): ``xmin`` - first transaction that can see row, |
24ffd84a171c
MVCC and transaction id.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2326
diff
changeset
|
276 |
``xmax`` - last transaction that can see row::: |
24ffd84a171c
MVCC and transaction id.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2326
diff
changeset
|
277 |
|
24ffd84a171c
MVCC and transaction id.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2326
diff
changeset
|
278 |
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
|
279 |
|
2328 | 280 |
Vacuum |
281 |
====== |
|
282 |
||
283 |
Stats on vacuum oprtations per table:: |
|
284 |
||
285 |
select * from pg_stat_user_tables; |
|
286 |
||
2300
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
287 |
Using psql client |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
288 |
================= |
1700 | 289 |
|
290 |
Using password file ``~/.pgpass``:: |
|
291 |
||
292 |
# comment |
|
293 |
hostname:port:database:username:password |
|
294 |
hostname:port:*:username:password |
|
295 |
hostname:*:*:username:password |
|
296 |
||
297 |
Connect by:: |
|
298 |
||
299 |
$ psql -U $USER -h $HOST $SCHEMA |
|
300 |
||
1710
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
301 |
How to view execution plan:: |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
302 |
|
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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diff
changeset
|
303 |
EXPLAIN query; |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
304 |
EXPLAIN ANALYZE query; |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
305 |
|
2300
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
306 |
Collect statistics:: |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
307 |
|
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
308 |
ANALYZE table; |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
309 |
|
1710
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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diff
changeset
|
310 |
How to redirect the output of query to a file:: |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
311 |
|
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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diff
changeset
|
312 |
\o output_file |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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diff
changeset
|
313 |
SELECT * FROM pg_class; |
601c31753686
Database, table, index size.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
1709
diff
changeset
|
314 |
|
2298
34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
changeset
|
315 |
Switch database:: |
34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
changeset
|
316 |
|
34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
changeset
|
317 |
\connect DBNAME |
34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
changeset
|
318 |
\c DBNAME |
34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
changeset
|
319 |
|
2300
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
320 |
Load external SQL file:: |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
321 |
|
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
322 |
\i my.sql |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
323 |
|
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
324 |
Export data |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
325 |
=========== |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
326 |
|
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
327 |
Export from ``psql``:: |
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
328 |
|
e538e158c38b
Export data. Load external SQL file. List schemas/indexes/etc.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2299
diff
changeset
|
329 |
\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
|
330 |
|
2305 | 331 |
Import data |
332 |
=========== |
|
333 |
||
334 |
Import CSV file:: |
|
335 |
||
336 |
\copy tbl_name from 'my.csv' csv; |
|
337 |
\copy tbl_name from 'my.csv' delimiter ':' csv; |
|
338 |
||
339 |
$ psql -U $USER -h $HOST $DB -c "\\copy tbl_name from 'my.csv' csv" |
|
340 |
||
2326 | 341 |
JDBC driver |
342 |
=========== |
|
343 |
||
344 |
https://jdbc.postgresql.org/about/about.html |
|
345 |
The current version of the driver should be compatible with PostgreSQL 8.2 and higher, and Java 6 |
|
346 |
(JDBC 4.0), Java 7 (JDBC 4.1), Java 8 (JDBC 4.2) and Java 9. |
|
347 |
https://jdbc.postgresql.org/download.html |
|
348 |
Java/JDBC/Postgres compatibility table. |
|
349 |
||
2332 | 350 |
plpgsql |
351 |
======= |
|
352 |
||
353 |
Simple function:: |
|
354 |
||
355 |
CREATE OR REPLACE FUNCTION incx(x INTEGER) |
|
356 |
RETURNS INTEGER STABLE AS $$ |
|
357 |
BEGIN |
|
358 |
RETURN x + 1; |
|
359 |
END; |
|
360 |
$$ LANGUAGE plpgsql; |
|
361 |
||
362 |
Support for procedures is added only in Postgres v11. |
|
363 |
||
364 |
https://www.postgresql.org/docs/current/sql-createfunction.html |
|
365 |
``CREATE FUNCTION``. |
|
366 |
https://www.postgresql.org/docs/current/plpgsql-control-structures.html |
|
367 |
plpgsql control structures. |
|
368 |
https://www.postgresql.org/docs/current/errcodes-appendix.html |
|
369 |
PostgreSQL Error Codes. |