創建鎖監控視圖

具體如何查詢當前的鎖等待和持鎖信息，您可以通過如下SQL語句創建鎖監控視圖。

說明 本文的所有SQL命令均在psql客戶端中執行，請使用psql連接數據庫。

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.transactionid,

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.procpid 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.transactionid,

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.procpid 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.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,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||' ,

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||' ,

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,transactionid::text,classid,objid,objsubid;

總結

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