n_tup_upd | 0 n_tup_del | 55000 n_tup_hot_upd | 0 n_live_tup | 0# 这两个都变成0说明表空间已经被回收n_dead_tup | 0# 这两个都变成0说明表空间已经被回收n_mod_since_analyze | 0 n_ins_since_vacuum | 0 last_vacuum | 2024-10-25 11:39:54.195119+08 last_autovacuum | 2024-10...
relname,n_live_tup FROM pg_stat_user_tables ...
在PostgreSQL中查询所有表的数据量,可以通过以下几种方法实现。下面我将详细解释每种方法,并提供相应的SQL代码片段。 方法一:使用pg_stat_user_tables视图 PostgreSQL的pg_stat_user_tables视图提供了关于用户表的一些统计信息,包括行数(n_live_tup)。这是一个快速获取表数据量的方法,但请注意,这个值是一个估计值...
n_dead_tup,---n_dead_tup的数据量是未回收的空间n_live_tup,---n_live_tup的数量是当前表的数据量coalesce(round(n_dead_tup*100/(casewhenn_live_tup+n_dead_tup=0thennullelsen_live_tup+n_dead_tupend),2),0.00)asdead_tup_ratio---dead_tup占所有有数据的行的百分比frompg_stat_all_table...
n_live_tup当前表的数据量 即触发 分析和清理时 表的数据可以维持一个动态平衡。 https://blog.csdn.net/wzyzzu/article/details/50426692 https://my.oschina.net/lcc1990/blog/1934262 这个是创建测试数据的链接,用了一个比较投机的方法,通过物理id移动数据到数据开头。
lukes0818=# SELECT schemaname,relname,n_live_tup,n_dead_tup FROM pg_stat_user_tables where relname='t1' ORDER BY n_dead_tup; schemaname | relname | n_live_tup | n_dead_tup ---+---+---+--- public | t1 | 2000012 | 0 (1 row) lukes0818=...
SELECT schemaname,relname,n_live_tup FROM pg_stat_user_tables ORDER BY n_live_tup ...
n_tup_upd:usage: "COUNTER"description: "Number of rows updated"- n_tup_del:usage: "COUNTER"description: "Number of rows deleted"- n_tup_hot_upd:usage: "COUNTER"description: "Number of rows HOT updated (i.e., with no separate index update required)"- n_live_tup:usage: "GAUGE"...
seq_tup_read | 5831 idx_scan | 1 idx_tup_fetch | 1001 n_tup_ins | 2001 n_tup_upd | 0 n_tup_del | 1597 n_tup_hot_upd | 0 n_live_tup | 403 n_dead_tup | 605 last_vacuum | last_autovacuum | 2016-12-08 18:09:00.7149-07 ...
n_live_tup | 23047184 n_dead_tup | 108373 ... We can then take this information, together with the autovacuum settings, and visualize it: Here you can see that as soon as the dead tuples (grey/red area) reach the threshold (grey line), a VACUUM process kicks off (red line in the...