author | Oleksandr Gavenko <gavenkoa@gmail.com> |
Fri, 14 Dec 2018 12:01:36 +0200 | |
changeset 2299 | fac6b2db427b |
parent 2298 | 34ffcffdc8df |
child 2300 | e538e158c38b |
permissions | -rw-r--r-- |
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.. -*- 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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:local: |
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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 "mypguser" WITH PASSWORD 'mypguserpass'; |
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postgres=# CREATE DATABASE "mypgdatabase" OWNER "mypguser"; |
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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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Create local host superuser.
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parents:
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$ 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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https://wiki.debian.org/PostgreSql |
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Debian wiki instructions. |
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parents:
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List databases, schemas and tables |
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================================== |
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parents:
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To switch databases.
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parents:
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Default database is ``postgres``. |
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Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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To list databases and database locales:: |
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$ 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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parents:
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To switch databases.
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parents:
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To switch databases:: |
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To switch databases.
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parents:
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=> \connect NAME |
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Schemas:: |
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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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=> \dn * |
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To list all tables in the current database:: |
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parents:
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=> SELECT table_schema,table_name FROM information_schema.tables ORDER BY table_schema,table_name; |
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=> \dt |
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parents:
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List users:: |
34ffcffdc8df
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Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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\du |
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\du+ |
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List misc info:: |
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select current_database(); |
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select current_schema(); |
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select current_user; |
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select session_user; |
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select current_date; |
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select version(); |
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https://www.postgresql.org/docs/current/functions-info.html |
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System Information Functions. |
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parents:
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Set default schema.
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Set default schema. |
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Set default schema.
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=================== |
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Set default schema.
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:: |
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Set default schema.
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Set default schema.
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set search_path to NAME; |
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parents:
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set schema 'NAME'; |
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parents:
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Database, table, index size |
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parents:
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=========================== |
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Database size:: |
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parents:
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SELECT pg_database_size('geekdb'); -- in bytes |
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SELECT pg_size_pretty(pg_database_size('dbname')); |
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List of databases sizes:: |
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\l+ |
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parents:
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List tables sizes:: |
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\d+ |
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Table total size (with indexes):: |
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SELECT pg_size_pretty(pg_total_relation_size('schemaname.tablename')); |
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Sole table size (without indexes and other):: |
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parents:
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SELECT pg_size_pretty(pg_relation_size('schemaname.tablename')); |
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Largest table in the PostgreSQL database:: |
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SELECT relname, relpages FROM pg_class ORDER BY relpages DESC; |
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parents:
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Using psql client. |
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================== |
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Using password file ``~/.pgpass``:: |
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# comment |
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hostname:port:database:username:password |
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hostname:port:*:username:password |
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hostname:*:*:username:password |
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Connect by:: |
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$ psql -U $USER -h $HOST $SCHEMA |
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How to view execution plan:: |
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Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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parents:
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EXPLAIN query; |
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parents:
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EXPLAIN ANALYZE query; |
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parents:
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parents:
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How to redirect the output of query to a file:: |
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Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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\o output_file |
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parents:
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SELECT * FROM pg_class; |
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parents:
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2298
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List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
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Switch database:: |
34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
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34ffcffdc8df
List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
2297
diff
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\connect DBNAME |
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List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
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\c DBNAME |
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List users. Switch database.
Oleksandr Gavenko <gavenkoa@gmail.com>
parents:
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diff
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