72 lines
1.6 KiB
Markdown
72 lines
1.6 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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```
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SELECT
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w1.pid AS 等待进程,
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w1.MODE AS 等待锁模式,
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w2.usename AS 等待用户,
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w2.query AS 等待会话,
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b1.pid AS 锁的进程,
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b1.MODE 锁的锁模式,
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b2.usename AS 锁的用户,
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b2.query AS 锁的会话,
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b2.application_name 锁的应用,
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b2.client_addr 锁的 IP地址,
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b2.query_start 锁的语句执行时间
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FROM
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pg_locks w1
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JOIN pg_stat_activity w2 ON w1.pid = w2.pid
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JOIN pg_locks b1 ON w1.transactionid = b1.transactionid
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AND w1.pid != b1.pid
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JOIN pg_stat_activity b2 ON b1.pid = b2.pid
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WHERE
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NOT w1.GRANTED;
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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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