Oracle数据库死锁查询

检查是否存在死锁

select sess.sid,
sess.serial#,
lo.oracle_username,
lo.os_user_name,
ao.object_name,
lo.locked_mode
from v$locked_object lo, dba_objects ao, v$session sess
where ao.object_id = lo.object_id
and lo.session_id = sess.sid;

检查死锁的sql

select sql_text
from v$sql
where hash_value in
(select sql_hash_value
from v$session
where sid in (select session_id from v$locked_object));
检查死锁用户的sql

select b.username, b.serial#, d.id1, a.sql_text
from v$lock d, v$session b, v$sqltext a
where b.lockwait = d.kaddr
and a.address = b.sql_address
and a.hash_value = b.sql_hash_value;

检查死锁用户和程序

select username, lockwait, status, machine, program
from v$session
where sid in (select session_id from v$locked_object);

确定谁锁了谁

select s1.username || '@' || s1.machine || ' ( SID=' || s1.sid ||
' ) is blocking ' || s2.username || '@' || s2.machine || ' ( SID=' ||
s2.sid || ' ) ' AS blocking_status
from v$lock l1, v$session s1, v$lock l2, v$session s2
where s1.sid = l1.sid
and s2.sid = l2.sid
and l1.BLOCK = 1
and l2.request > 0
and l1.id1 = l2.id1
and l2.id2 = l2.id2;

确定链接的sql

select sql_text from v$session v,v$sql s where SID=345 and v.sql_hash_value = s.hash_value;