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  • PostgreSQL 锁等待监控 珍藏级SQL

    查看当前事务锁等待、持锁信息的SQL
    这条SQL非常有用,建议DBA珍藏。
    
    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 ;  
    如果觉得写SQL麻烦,可以将它创建为视图
    
    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 ;  
    例子
    postgres=# create table locktest(id int primary key, info text);  
    CREATE TABLE  
    postgres=# insert into locktest values (1,'a');  
    INSERT 0 1  
    会话A
    postgres=# begin;  
    BEGIN  
    postgres=# update locktest set info='a' where id=1;  
    UPDATE 1  
    postgres=# select * from locktest ;  
     id | info   
    ----+------  
      1 | a  
    (1 row)  
    会话B
    postgres=# begin;  
    BEGIN  
    postgres=# select * from locktest ;  
     id | info   
    ----+------  
      1 | a  
    (1 row)  
    会话C
    postgres=# begin;  
    BEGIN  
    postgres=# insert into locktest values (2,'test');  
    INSERT 0 1  
    会话D
    postgres=# begin;  
    BEGIN  
    postgres=# truncate locktest ;  
      
    waiting......  
    会话E
    postgres=# select * from locktest ;  
      
    waiting......  
    会话F
    postgres=#   x  
    Expanded display is on.  
    postgres=# select * from v_locks_monitor ;  
    -[ RECORD 1 ]-+------------------------------------------------------------------------------------------------------------------------------------------------------  
    locktype      | relation  
    datname       | postgres  
    relation      | locktest  
    page          |   
    tuple         |   
    virtualxid    |   
    transactionid |   
    classid       |   
    objid         |   
    objsubid      |   
    string_agg    | Pid: 23043                                                                                                                                           +  
                  | Granted: false , Mode: AccessExclusiveLock , FastPath: false , VirtualTransaction: 4/1450064 , Session_State: active                                 +  
                  | Username: postgres , Database: postgres , Client_Addr: NULL , Client_Port: -1 , Application_Name: psql                                               +  
                  | Xact_Start: 2017-05-21 21:43:43.735829+08 , Query_Start: 2017-05-21 21:43:50.965797+08 , Xact_Elapse: 00:01:11.919991 , Query_Elapse: 00:01:04.690023+  
                  | Query: truncate locktest ;                                                                                                                           +  
                  | --------                                                                                                                                             +  
                  | Pid: 40698                                                                                                                                           +  
                  | Granted: true , Mode: RowExclusiveLock , FastPath: false , VirtualTransaction: 6/1031925 , Session_State: idle in transaction                        +  
                  | Username: postgres , Database: postgres , Client_Addr: NULL , Client_Port: -1 , Application_Name: psql                                               +  
                  | Xact_Start: 2017-05-21 21:43:15.173798+08 , Query_Start: 2017-05-21 21:43:24.338804+08 , Xact_Elapse: 00:01:40.482022 , Query_Elapse: 00:01:31.317016+  
                  | Query: insert into locktest values (2,'test');                                                                                                       +  
                  | --------                                                                                                                                             +  
                  | Pid: 17515                                                                                                                                           +  
                  | Granted: true , Mode: RowExclusiveLock , FastPath: false , VirtualTransaction: 3/5671759 , Session_State: idle in transaction                        +  
                  | Username: postgres , Database: postgres , Client_Addr: NULL , Client_Port: -1 , Application_Name: psql                                               +  
                  | Xact_Start: 2017-05-21 21:42:19.199124+08 , Query_Start: 2017-05-21 21:42:47.820125+08 , Xact_Elapse: 00:02:36.456696 , Query_Elapse: 00:02:07.835695+  
                  | Query: select * from locktest ;                                                                                                                      +  
                  | --------                                                                                                                                             +  
                  | Pid: 17515                                                                                                                                           +  
                  | Granted: true , Mode: RowExclusiveLock , FastPath: false , VirtualTransaction: 3/5671759 , Session_State: idle in transaction                        +  
                  | Username: postgres , Database: postgres , Client_Addr: NULL , Client_Port: -1 , Application_Name: psql                                               +  
                  | Xact_Start: 2017-05-21 21:42:19.199124+08 , Query_Start: 2017-05-21 21:42:47.820125+08 , Xact_Elapse: 00:02:36.456696 , Query_Elapse: 00:02:07.835695+  
                  | Query: select * from locktest ;                                                                                                                      +  
                  | --------                                                                                                                                             +  
                  | Pid: 40698                                                                                                                                           +  
                  | Granted: true , Mode: RowExclusiveLock , FastPath: false , VirtualTransaction: 6/1031925 , Session_State: idle in transaction                        +  
                  | Username: postgres , Database: postgres , Client_Addr: NULL , Client_Port: -1 , Application_Name: psql                                               +  
                  | Xact_Start: 2017-05-21 21:43:15.173798+08 , Query_Start: 2017-05-21 21:43:24.338804+08 , Xact_Elapse: 00:01:40.482022 , Query_Elapse: 00:01:31.317016+  
                  | Query: insert into locktest values (2,'test');                                                                                                       +  
                  | --------                                                                                                                                             +  
                  | Pid: 40199                                                                                                                                           +  
                  | Granted: true , Mode: AccessShareLock , FastPath: false , VirtualTransaction: 5/1029276 , Session_State: idle in transaction                         +  
                  | Username: postgres , Database: postgres , Client_Addr: NULL , Client_Port: -1 , Application_Name: psql                                               +  
                  | Xact_Start: 2017-05-21 21:43:01.745129+08 , Query_Start: 2017-05-21 21:43:05.928125+08 , Xact_Elapse: 00:01:53.910691 , Query_Elapse: 00:01:49.727695+  
                  | Query: select * from locktest ;                                                                                                                      +  
                  | --------                                                                                                                                             +  
                  | Pid: 17515                                                                                                                                           +  
                  | Granted: true , Mode: AccessShareLock , FastPath: false , VirtualTransaction: 3/5671759 , Session_State: idle in transaction                         +  
                  | Username: postgres , Database: postgres , Client_Addr: NULL , Client_Port: -1 , Application_Name: psql                                               +  
                  | Xact_Start: 2017-05-21 21:42:19.199124+08 , Query_Start: 2017-05-21 21:42:47.820125+08 , Xact_Elapse: 00:02:36.456696 , Query_Elapse: 00:02:07.835695+  
                  | Query: select * from locktest ;                                                                                                                      +  
                  | --------                                                                                                                                             +  
                  | Pid: 40199                                                                                                                                           +  
                  | Granted: true , Mode: AccessShareLock , FastPath: false , VirtualTransaction: 5/1029276 , Session_State: idle in transaction                         +  
                  | Username: postgres , Database: postgres , Client_Addr: NULL , Client_Port: -1 , Application_Name: psql                                               +  
                  | Xact_Start: 2017-05-21 21:43:01.745129+08 , Query_Start: 2017-05-21 21:43:05.928125+08 , Xact_Elapse: 00:01:53.910691 , Query_Elapse: 00:01:49.727695+  
                  | Query: select * from locktest ;                                                                                                                      +  
                  | --------                                                                                                                                             +  
                  | Pid: 17515                                                                                                                                           +  
                  | Granted: true , Mode: AccessShareLock , FastPath: false , VirtualTransaction: 3/5671759 , Session_State: idle in transaction                         +  
                  | Username: postgres , Database: postgres , Client_Addr: NULL , Client_Port: -1 , Application_Name: psql                                               +  
                  | Xact_Start: 2017-05-21 21:42:19.199124+08 , Query_Start: 2017-05-21 21:42:47.820125+08 , Xact_Elapse: 00:02:36.456696 , Query_Elapse: 00:02:07.835695+  
                  | Query: select * from locktest ;                                                                                                                      +  
                  | --------                                                                                                                                             +  
                  | Pid: 24781                                                                                                                                           +  
                  | Granted: false , Mode: AccessShareLock , FastPath: false , VirtualTransaction: 7/1025270 , Session_State: active                                     +  
                  | Username: postgres , Database: postgres , Client_Addr: NULL , Client_Port: -1 , Application_Name: psql                                               +  
                  | Xact_Start: 2017-05-21 21:44:20.725834+08 , Query_Start: 2017-05-21 21:44:20.725834+08 , Xact_Elapse: 00:00:34.929986 , Query_Elapse: 00:00:34.929986+  
                  | Query: select * from locktest ;  
    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,按锁的大小排序,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(23043);  
    -[ RECORD 1 ]--------+--  
    pg_terminate_backend | t  
    会话D
    
    FATAL:  terminating connection due to administrator command  
    server closed the connection unexpectedly  
            This probably means the server terminated abnormally  
            before or while processing the request.  
    The connection to the server was lost. Attempting reset: Succeeded.  
    干掉23043后,大家都清净了
    
    postgres=# select * from v_locks_monitor ;  
    (0 rows)  
    

    转载:http://www.360doc.com/content/20/0415/09/69535774_906149767.shtml
    参考来自dba大佬的回答:https://developer.aliyun.com/ask/54578?spm=a2c6h.13159736

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  • 原文地址:https://www.cnblogs.com/caidingyu/p/12703421.html
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