1 、查詢pg中單張表的大小（不包含索引）

selectpg_size_pretty(pg_relation_size('schema.table_name'));

2 、查詢數據庫中所有表的大小

selectrelname,pg_size_pretty(pg_relation_size(relid)) frompg_stat_user_tables whereschemaname = 'public' order bypg_relation_size(relid) desc;

3 、按順序查看索引

selectindexrelname,pg_size_pretty(pg_relation_size(relid)) frompg_stat_user_indexes whereschemaname = 'public' order bypg_relation_size(relid) desc;

4 、查詢數據庫的大小

selectpg_database.datname,pg_size_pretty (pg_database_size(pg_database.datname)) as size frompg_database;

5 、查詢被鎖定的表

selectpg_class.relname as table,pg_database.datname as database,pid,mode,granted frompg_locks,pg_class,pg_database wherepg_locks.relation = pg_class.oidand pg_locks.database = pg_database.oid;

6 、查詢一個Schema下面的所有表的總大小（單位MB，包括索引和數據）

selectschemaname ,round(sum(pg_total_relation_size(schemaname || '.' || tablename))/ 1024 / 1024) "Size_MB" frompg_tables whereschemaname = '<schemaname>' group by1;

7 、查詢所有表的大小并排序（包含索引）

selecttable_schema || '.' || table_name as table_full_name,pg_size_pretty(pg_total_relation_size('"' || table_schema || '"."' || table_name || '"')) as size frominformation_schema.tables order bypg_total_relation_size('"' || table_schema || '"."' || table_name || '"') desc limit 20;

8 、查詢表大小按大小排序并分離data與index

selecttable_name,pg_size_pretty(table_size) as table_size,pg_size_pretty(indexes_size) as indexes_size,pg_size_pretty(total_size) as total_size from(selecttable_name,pg_table_size(table_name) as table_size,pg_indexes_size(table_name) as indexes_size,pg_total_relation_size(table_name) as total_sizefrom(select('"' || table_schema || '"."' || table_name || '"') as table_namefrominformation_schema.tables) as all_tablesorder bytotal_size desc) as pretty_sizes;

或者

selecttable_name,pg_size_pretty(table_size) as table_size,pg_size_pretty(indexes_size) as indexes_size,pg_size_pretty(total_size) as total_size from(selecttable_name,pg_table_size(table_name) as table_size,pg_indexes_size(table_name) as indexes_size,pg_total_relation_size(table_name) as total_sizefrom(select('' || table_schema || '.' || table_name || '') as table_namefrominformation_schema.tables) as all_tablesorder bytotal_size desc) as pretty_sizes;

總結

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