转载地址: https://blog.csdn.net/rocklee/article/details/51251174
统计各数据库占用磁盘大小:
SELECT d.datname AS Name, pg_catalog.pg_get_userbyid(d.datdba) AS Owner,
CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')
THEN pg_catalog.pg_size_pretty(pg_catalog.pg_database_size(d.datname))
ELSE 'No Access'
END AS SIZE
FROM pg_catalog.pg_database d
ORDER BY
CASE WHEN pg_catalog.has_database_privilege(d.datname, 'CONNECT')
THEN pg_catalog.pg_database_size(d.datname)
ELSE NULL
END DESC -- nulls first
LIMIT 20 ;
统计数据库中各表占用磁盘大小:
SELECT
table_schema || '.' || table_name AS table_full_name,
pg_size_pretty(pg_total_relation_size('"' || table_schema || '"."' || table_name || '"')) AS size
FROM information_schema.tables
ORDER BY
pg_total_relation_size('"' || table_schema || '"."' || table_name || '"') DESC ;
统计testdb库中各索引占用磁盘大小:
\c testdb
select schemaname,relname,indexrelname,pg_size_pretty( pg_relation_size(relid)) from pg_stat_user_indexes order by pg_relation_size(relid) desc limit 10 ;