达梦数据库常用监控语句

--查询活动会话数
select count(*) from v$sessions where state='ACTIVE';

--结束会话
sp_close_session(sessid);  --v$session中查出来的session id

--找出已执行超过2秒的活动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;

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

--阻塞查询
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;