转载自博客
http://blog.51yip.com/pgsql/1525.html
1,查看数据库
playboy=> \l //\加上字母l,相当于MysqL的，MysqL> show databases; List of databases Name | Owner | Encoding -----------+----------+---------- playboy | postgres | UTF8 postgres | postgres | UTF8 template0 | postgres | UTF8 template1 | postgres | UTF8 playboy=> select pg_database_size('playboy'); //查看playboy数据库的大小 pg_database_size ------------------ 3637896 (1 row) playboy=> select pg_database.datname,pg_database_size(pg_database.datname) AS size from pg_database; //查看所有数据库的大小 datname | size -----------+--------- postgres | 3621512 playboy | 3637896 template1 | 3563524 template0 | 3563524 (4 rows) playboy=> select pg_size_pretty(pg_database_size('playboy')); //以KB，MB，GB的方式来查看数据库大小 pg_size_pretty ---------------- 3553 kB (1 row)
2，查看多表
playboy=> \d test; //相当于MysqL的，MysqL> desc test; Table "public.test" Column | Type | Modifiers --------+-----------------------+----------- id | integer | not null name | character varying(32) | Indexes: "playboy_id_pk" PRIMARY KEY,btree (id) playboy=> select pg_relation_size('test'); //查看表大小 pg_relation_size ------------------ 0 (1 row) playboy=> select pg_size_pretty(pg_relation_size('test')); //以KB，MB，GB的方式来查看表大小 pg_size_pretty ---------------- 0 bytes (1 row) playboy=> select pg_size_pretty(pg_total_relation_size('test')); //查看表的总大小，包括索引大小 pg_size_pretty ---------------- 8192 bytes (1 row)3，查看单表
playboy=> \d test; //相当于MysqL的，MysqL> desc test; Table "public.test" Column | Type | Modifiers --------+-----------------------+----------- id | integer | not null name | character varying(32) | Indexes: "playboy_id_pk" PRIMARY KEY,btree (id) playboy=> select pg_relation_size('test'); //查看表大小 pg_relation_size ------------------ 0 (1 row) playboy=> select pg_size_pretty(pg_relation_size('test')); //以KB，MB，GB的方式来查看表大小 pg_size_pretty ---------------- 0 bytes (1 row) playboy=> select pg_size_pretty(pg_total_relation_size('test')); //查看表的总大小，包括索引大小 pg_size_pretty ---------------- 8192 bytes (1 row)
4，查看索引
playboy=> \di //相当于MysqL的，MysqL> show index from test; List of relations Schema | Name | Type | Owner | Table --------+---------------+-------+---------+------- public | playboy_id_pk | index | playboy | test (1 row) playboy=> select pg_size_pretty(pg_relation_size('playboy_id_pk')); //查看索大小 pg_size_pretty ---------------- 8192 bytes (1 row)
5，查看表空间，以及大小
playboy=> select spcname from pg_tablespace; //查看所有表空间
spcname
------------
pg_default
pg_global
(2 rows)
playboy=> select pg_size_pretty(pg_tablespace_size('pg_default')); //查看表空间大小
pg_size_pretty
----------------
14 MB
(1 row)
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