postgres=# select * from pg_stat_user_tables where relname = 'test'; -[ RECORD 1 ]-------+------------------------------ relid | 23400 schemaname | public relname | test seq_scan | 12 seq_tup_read | 49290 idx_scan | idx_tup_fetch | n_tup_ins | 22916 n_tup_upd | 25249 n_tup_del | 0 n_tup_hot_upd | 0 n_live_tup | 22916 n_dead_tup | 2333 n_mod_since_analyze | 0 last_vacuum | last_autovacuum | 2019-10-09 09:15:52.549356+08 last_analyze | last_autoanalyze | 2019-10-09 09:15:55.279256+08 vacuum_count | 0 autovacuum_count | 1 analyze_count | 0 autoanalyze_count | 2 postgres=# vacuum landing_person_cdl_02; #执行手工的清理 VACUUM postgres=# select * from pg_stat_user_tables where relname = 'landing_person_cdl_02'; #查看清理结果 -[ RECORD 1 ]-------+------------------------------ relid | 23400 schemaname | public relname | landing_person_cdl_02 seq_scan | 12 seq_tup_read | 49290 idx_scan | idx_tup_fetch | n_tup_ins | 22916 n_tup_upd | 25249 n_tup_del | 0 n_tup_hot_upd | 0 n_live_tup | 21923 n_dead_tup | 0 n_mod_since_analyze | 0 last_vacuum | 2019-10-10 09:57:09.651626+08 last_autovacuum | 2019-10-09 09:15:52.549356+08 last_analyze | last_autoanalyze | 2019-10-09 09:15:55.279256+08 vacuum_count | 1 autovacuum_count | 1 analyze_count | 0 autoanalyze_count | 2
说明
n_live_tup的数量是当前表的数据量。
n_dead_tup的数据量是未回收的空间。
查看表的大小
select pg_size_pretty(pg_relation_size('test'));