013.PGSQL-查看sql正在運行的進程、查看表是否被鎖、解鎖表

1.PGSQL-查看sql正在運行的進程

SELECT datname,pid,state,query FROM pg_stat_activity where state='active'

 

SELECT procpid, START, now() - START AS lap, current_query FROM ( SELECT backendid, pg_stat_get_backend_pid (S.backendid) AS procpid, pg_stat_get_backend_activity_start (S.backendid) AS START, pg_stat_get_backend_activity (S.backendid) AS current_query FROM ( SELECT pg_stat_get_backend_idset () AS backendid ) AS S ) AS S WHERE current_query <> '<IDLE>'
ORDER BY lap DESC;

 

procpid：進程id
start：進程開始時間
lap：經過時間
current_query：執行中的sql
怎樣停止正在執行的sql
SELECT pg_cancel_backend(進程id);
或者用系統函數
kill -9 進程id;

 

2.查看表是否被鎖，解鎖表

 

select oid from pg_class where relname='m_ss_kjcx_tech_inovate_talent' 
select pid from pg_locks where relation='4384913' 
--如果查詢到了結果，表示該表被鎖 則需要釋放鎖定 
select pg_cancel_backend(140650678843136)

 

通過命令： 
=# select pg_cancel_backend(線程id); 
來kill掉指定的SQL語句。（這個函數只能 kill Select 查詢，而updae,delete DML不生效）
使用可以kill 各種DML(SELECT,UPDATE,DELETE,DROP)操作= 
=# select pg_terminate_backend(pid int)

-- PGSQL
select oid from pg_class where relname='m_ss_kjcx_tech_inovate_talent' 
select pid from pg_locks where relation='4384913' 
--如果查詢到了結果，表示該表被鎖 則需要釋放鎖定 
select pg_cancel_backend(140650678843136) --- 來查看有哪些SQL正在執行。 waiting='t'

select pid,backend_start,application_name,query_start,waiting,state ,query from pg_stat_activity
where query <>''
order by query_start asc

 通過命令： =# select pg_cancel_backend(線程id); 來kill掉指定的SQL語句。（這個函數只能 kill Select 查詢，而updae,delete DML不生效） 使用可以kill 各種DML(SELECT,UPDATE,DELETE,DROP)操作= 
=# select pg_terminate_backend(pid int)