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with t_wait as ( select a.mode,a.locktype,a.database,a.relation,a.page,a.tuple,a.classid,a.granted, a.objid,a.objsubid,a.pid,a.virtualtransaction,a.virtualxid,a.transactionid,a.fastpath, b.state,b.query,b.xact_start,b.query_start,b.usename,b.datname,b.client_addr,b.client_port,b.application_name from pg_locks a,pg_stat_activity b where a.pid=b.pid and not a.granted ), t_run as ( select a.mode,a.locktype,a.database,a.relation,a.page,a.tuple,a.classid,a.granted, a.objid,a.objsubid,a.pid,a.virtualtransaction,a.virtualxid,a.transactionid,a.fastpath, b.state,b.query,b.xact_start,b.query_start,b.usename,b.datname,b.client_addr,b.client_port,b.application_name from pg_locks a,pg_stat_activity b where a.pid=b.pid and a.granted ), t_overlap as ( select r.* from t_wait w join t_run r on ( r.locktype is not distinct from w.locktype and r.database is not distinct from w.database and r.relation is not distinct from w.relation and r.page is not distinct from w.page and r.tuple is not distinct from w.tuple and r.virtualxid is not distinct from w.virtualxid and r.transactionid is not distinct from w.transactionid and r.classid is not distinct from w.classid and r.objid is not distinct from w.objid and r.objsubid is not distinct from w.objsubid and r.pid <> w.pid ) ), t_unionall as ( select r.* from t_overlap r union all select w.* from t_wait w ) select locktype,datname,relation::regclass,page,tuple,virtualxid,transactionid::text,classid::regclass,objid,objsubid, string_agg( 'Pid: '||case when pid is null then 'NULL' else pid::text end||chr(10)|| 'Lock_Granted: '||case when granted is null then 'NULL' else granted::text end||' , Mode: '||case when mode is null then 'NULL' else mode::text end||' , FastPath: '||case when fastpath is null then 'NULL' else fastpath::text end||' , VirtualTransaction: '||case when virtualtransaction is null then 'NULL' else virtualtransaction::text end||' , Session_State: '||case when state is null then 'NULL' else state::text end||chr(10)|| 'Username: '||case when usename is null then 'NULL' else usename::text end||' , Database: '||case when datname is null then 'NULL' else datname::text end||' , Client_Addr: '||case when client_addr is null then 'NULL' else client_addr::text end||' , Client_Port: '||case when client_port is null then 'NULL' else client_port::text end||' , Application_Name: '||case when application_name is null then 'NULL' else application_name::text end||chr(10)|| 'Xact_Start: '||case when xact_start is null then 'NULL' else xact_start::text end||' , Query_Start: '||case when query_start is null then 'NULL' else query_start::text end||' , Xact_Elapse: '||case when (now()-xact_start) is null then 'NULL' else (now()-xact_start)::text end||' , Query_Elapse: '||case when (now()-query_start) is null then 'NULL' else (now()-query_start)::text end||chr(10)|| 'SQL (Current SQL in Transaction): '||chr(10)|| case when query is null then 'NULL' else query::text end, chr(10)||'--------'||chr(10) order by ( case mode when 'INVALID' then 0 when 'AccessShareLock' then 1 when 'RowShareLock' then 2 when 'RowExclusiveLock' then 3 when 'ShareUpdateExclusiveLock' then 4 when 'ShareLock' then 5 when 'ShareRowExclusiveLock' then 6 when 'ExclusiveLock' then 7 when 'AccessExclusiveLock' then 8 else 0 end ) desc, (case when granted then 0 else 1 end) ) as lock_conflict from t_unionall group by locktype,datname,relation,page,tuple,virtualxid,transactionid::text,classid,objid,objsubid;
create view v_locks_monitor as with t_wait as ( select a.mode,a.locktype,a.database,a.relation,a.page,a.tuple,a.classid,a.granted, a.objid,a.objsubid,a.pid,a.virtualtransaction,a.virtualxid,a.transactionid,a.fastpath, b.state,b.query,b.xact_start,b.query_start,b.usename,b.datname,b.client_addr,b.client_port,b.application_name from pg_locks a,pg_stat_activity b where a.pid=b.pid and not a.granted ), t_run as ( select a.mode,a.locktype,a.database,a.relation,a.page,a.tuple,a.classid,a.granted, a.objid,a.objsubid,a.pid,a.virtualtransaction,a.virtualxid,a.transactionid,a.fastpath, b.state,b.query,b.xact_start,b.query_start,b.usename,b.datname,b.client_addr,b.client_port,b.application_name from pg_locks a,pg_stat_activity b where a.pid=b.pid and a.granted ), t_overlap as ( select r.* from t_wait w join t_run r on ( r.locktype is not distinct from w.locktype and r.database is not distinct from w.database and r.relation is not distinct from w.relation and r.page is not distinct from w.page and r.tuple is not distinct from w.tuple and r.virtualxid is not distinct from w.virtualxid and r.transactionid is not distinct from w.transactionid and r.classid is not distinct from w.classid and r.objid is not distinct from w.objid and r.objsubid is not distinct from w.objsubid and r.pid <> w.pid ) ), t_unionall as ( select r.* from t_overlap r union all select w.* from t_wait w ) select locktype,datname,relation::regclass,page,tuple,virtualxid,transactionid::text,classid::regclass,objid,objsubid, string_agg( 'Pid: '||case when pid is null then 'NULL' else pid::text end||chr(10)|| 'Lock_Granted: '||case when granted is null then 'NULL' else granted::text end||' , Mode: '||case when mode is null then 'NULL' else mode::text end||' , FastPath: '||case when fastpath is null then 'NULL' else fastpath::text end||' , VirtualTransaction: '||case when virtualtransaction is null then 'NULL' else virtualtransaction::text end||' , Session_State: '||case when state is null then 'NULL' else state::text end||chr(10)|| 'Username: '||case when usename is null then 'NULL' else usename::text end||' , Database: '||case when datname is null then 'NULL' else datname::text end||' , Client_Addr: '||case when client_addr is null then 'NULL' else client_addr::text end||' , Client_Port: '||case when client_port is null then 'NULL' else client_port::text end||' , Application_Name: '||case when application_name is null then 'NULL' else application_name::text end||chr(10)|| 'Xact_Start: '||case when xact_start is null then 'NULL' else xact_start::text end||' , Query_Start: '||case when query_start is null then 'NULL' else query_start::text end||' , Xact_Elapse: '||case when (now()-xact_start) is null then 'NULL' else (now()-xact_start)::text end||' , Query_Elapse: '||case when (now()-query_start) is null then 'NULL' else (now()-query_start)::text end||chr(10)|| 'SQL (Current SQL in Transaction): '||chr(10)|| case when query is null then 'NULL' else query::text end, chr(10)||'--------'||chr(10) order by ( case mode when 'INVALID' then 0 when 'AccessShareLock' then 1 when 'RowShareLock' then 2 when 'RowExclusiveLock' then 3 when 'ShareUpdateExclusiveLock' then 4 when 'ShareLock' then 5 when 'ShareRowExclusiveLock' then 6 when 'ExclusiveLock' then 7 when 'AccessExclusiveLock' then 8 else 0 end ) desc, (case when granted then 0 else 1 end) ) as lock_conflict from t_unionall group by locktype,datname,relation,page,tuple,virtualxid,transactionid::text,classid,objid,objsubid ;
create table table_lock(id int primary key, info text); insert into table_lock values (1,'a'); #session Abegin; update table_lock set info='aa' where id=1; select * from table_lock; #session Bbegin;select * from table_lock; #session Cbegin;insert into table_lock values (2,'b'); #session Dbegin; truncate table_lock; waiting...... #or#ALTER TABLE XXX RENAME TO XXXXX;#session Eselect * from table_lock; waiting......
Pid: 1980Lock_Granted: false , Mode: AccessExclusiveLock , FastPath: false , VirtualTransaction: 9/4 , Session_State: activeUsername: test , Database: postgres , Client_Addr: NULL , Client_Port: -1 , Application_Name: psqlXact_Start: 2019-02-11 15:35:33.054468+08 , Query_Start: 2019-02-11 15:35:34.283192+08 , Xact_Elapse: 00:01:18.422846 , Query_Elapse: 00:01:17.194122SQL (Current SQL in Transaction): truncate table_lock;--------Pid: 1894Lock_Granted: true , Mode: RowExclusiveLock , FastPath: false , VirtualTransaction: 5/128 , Session_State: idle in transactionUsername: test , Database: postgres , Client_Addr: NULL , Client_Port: -1 , Application_Name: psqlXact_Start: 2019-02-11 15:17:48.342793+08 , Query_Start: 2019-02-11 15:17:48.344543+08 , Xact_Elapse: 00:19:03.134521 , Query_Elapse: 00:19:03.132771SQL (Current SQL in Transaction): insert into table_lock values (2,'b');--------
# 处理方法# 1. 前面的锁查询SQL，已经清晰的显示了每一个发生了锁等待的对象，Lock_Granted: true阻塞了Lock_Granted: false# 2. 同时按锁的大小排序，第一行的锁最大（Mode: AccessExclusiveLock级别最高）# 要快速解出这种状态，terminate最大的锁对应的PID即可。postgres=# select pg_terminate_backend(1980);-[ RECORD 1 ]--------+--pg_terminate_backend | t
[postgres@pg2 data]$ ps -ef |grep idle |grep -v greppostgres 1953 1887 0 13:42 ? 00:00:00 postgres: pg postgres [local] idlepostgres 2066 1887 0 14:52 ? 00:00:00 postgres: pg postgres 192.168.6.1(53182) idle in transaction[postgres@pg2 data]$ ps -ef |grep idle |grep -v greppostgres 2066 1887 0 14:52 ? 00:00:00 postgres: pg postgres 192.168.6.1(53182) idle in transaction[postgres@pg2 data]$
select pid, state from pg_stat_activity;
select pg_terminate_backend(2066);
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