46 lines
1.1 KiB
Markdown
46 lines
1.1 KiB
Markdown
```postgresql
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SELECT locker.pid,
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pc.relname,
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locker.mode,
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locker_act.application_name,
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least(query_start,xact_start) start_time,
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locker_act.state,
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CASE
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WHEN granted='f' THEN
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'wait_lock'
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WHEN granted='t' THEN
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'get_lock'
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END lock_satus,current_timestamp - least(query_start,xact_start) AS runtime,
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locker_act.query
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FROM pg_locks locker,pg_stat_activity locker_act, pg_class pc
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WHERE locker.pid=locker_act.pid
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AND NOT locker.pid=pg_backend_pid()
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AND application_name<>'pg_statsinfod'
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AND locker.relation = pc.oid
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AND pc.reltype<>0 --and pc.relname='t'
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ORDER BY runtime desc;
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SELECT pg_terminate_backend(14448)
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```
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```postgresql
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-- 查看表的总大小，包括索引大小
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select pg_size_pretty(pg_total_relation_size('test'));
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-- 以KB，MB，GB的方式来查看表大小
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select pg_size_pretty(pg_relation_size('test'));
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-- 查看最大连接数
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show max_connections;
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-- 查看当前连接数
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SELECT COUNT(*) from pg_stat_activity;
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```
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