達夢7鎖超時查詢、解鎖【珍藏級】

在數據庫中經常會碰到對象被鎖住的情況，這裏分享下我之前整理的以下達夢中鎖相關的一些腳本。

–查詢活動會話數

select count(*) from v$sessions where state = 'active';

–已經執行超過2s的活動SQL

select * from (
SELECT sess_id,sql_text,datediff(ss,last_recv_time,sysdate) Y_EXETIME,
       SF_GET_SESSION_SQL(SESS_ID) fullsql,clnt_ip
 FROM V$SESSIONS WHERE STATE='ACTIVE')
 where Y_EXETIME>=2;

–鎖查詢

select o.name,l.* from v$lock l,sysobjects o where l.table_id=o.id and blocked=1;

–阻塞查詢

with locks as(
  select o.name,l.*,s.sess_id,s.sql_text,s.clnt_ip,s.last_send_time  from v$lock l,sysobjects o,v$sessions s
  where l.table_id=o.id and l.trx_id=s.trx_id ),
 lock_tr as (   select trx_id wt_trxid,row_idx blk_trxid from locks where blocked=1),
 res as(    select sysdate stattime,t1.name,t1.sess_id wt_sessid,s.wt_trxid,
     t2.sess_id blk_sessid,s.blk_trxid,t2.clnt_ip,SF_GET_SESSION_SQL(t1.sess_id) fulsql,
     datediff(ss,t1.last_send_time,sysdate) ss,t1.sql_text wt_sql  from lock_tr s,locks t1,locks t2
    where t1.ltype='OBJECT'  and t1.table_id<>0   and t2.ltype='OBJECT'  and t2.table_id<>0
     and s.wt_trxid=t1.trx_id  and s.blk_trxid=t2.trx_id)
select distinct wt_sql,clnt_ip,ss,wt_trxid,blk_trxid  from res;

經常用到的兩個查詢被鎖住對象和解鎖腳本：
–查看錶上的鎖是哪個會話導致的

select a.*,b.NAME,c.SESS_ID from v$lock a
left join sysobjects b on b.ID=a.TABLE_ID
left join v$sessions c on a.TRX_ID=c.TRX_ID;

–kill對應的session

sp_close_session(sess_id);