更新

postgresql锁表查询.md

@@ -0,0 +1,39 @@
+```
+SELECT locker.pid,
+       pc.relname,
+       locker.mode,
+       locker_act.application_name,
+       least(query_start,xact_start) start_time,
+       locker_act.state,
+       CASE
+           WHEN granted='f' THEN
+               'wait_lock'
+           WHEN granted='t' THEN
+               'get_lock'
+           END lock_satus,current_timestamp - least(query_start,xact_start) AS runtime,
+       locker_act.query
+FROM pg_locks locker,pg_stat_activity locker_act, pg_class pc
+WHERE locker.pid=locker_act.pid
+  AND NOT locker.pid=pg_backend_pid()
+  AND application_name<>'pg_statsinfod'
+  AND locker.relation = pc.oid
+  AND pc.reltype<>0 --and pc.relname='t'
+ORDER BY  runtime desc;
+
+
+SELECT pg_terminate_backend(14448)
+
+```
+
+
+
+```
+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  
+
+ 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  
+
+
+```
+