Oracle: How to find out if there is a transaction pending?

问题:

I'm looking for a way to find out if there are uncommited INSERT, UPDATE or DELETE statements in the current session. One way would be to check v$lock with the current sid, but that requires read access to v$lock, which is be a problem if the DBA doesn't want to grant it. Any other ways (other than keeping track of all database commands issued by the application)?

回答1:

you can check if your session has a row in V$TRANSACTION (obviously that requires read privilege on this view):

SQL> SELECT COUNT(*)   2    FROM v$transaction t, v$session s, v$mystat m   3   WHERE t.ses_addr = s.saddr   4     AND s.sid = m.sid   5     AND ROWNUM = 1;    COUNT(*) ----------          0  SQL> insert into a values (1);  1 row inserted  SQL> SELECT COUNT(*)   2    FROM v$transaction t, v$session s, v$mystat m   3   WHERE t.ses_addr = s.saddr   4     AND s.sid = m.sid   5     AND ROWNUM = 1;    COUNT(*) ----------          1  SQL> commit;  Commit complete  SQL> SELECT COUNT(*)   2    FROM v$transaction t, v$session s, v$mystat m   3   WHERE t.ses_addr = s.saddr   4     AND s.sid = m.sid   5     AND ROWNUM = 1;    COUNT(*) ----------          0 

回答2:

This is the query I normally use,

select s.sid       ,s.serial#       ,s.username       ,s.machine       ,s.status       ,s.lockwait       ,t.used_ublk       ,t.used_urec       ,t.start_time from v$transaction t inner join v$session s on t.addr = s.taddr; 

回答3:

SELECT * FROM V$TRANSACTION WHERE STATUS='ACTIVE';

See: http://forums.oracle.com/forums/thread.jspa?threadID=691061

回答4:

Also see...

How can I tell if I have uncommitted work in an Oracle transaction?

回答5:

Use the query below to find out pending transaction.

If it returns a value, it means there is a pending transaction.

Here is the query:

select dbms_transaction.step_id from dual;

References:
http://www.acehints.com/2011/07/how-to-check-pending-transaction-in.html http://www.acehints.com/p/site-map.html

回答6:

The easiest and most reliable solution is to try and start a transaction and see it if succeeds. If some code already started a transaction but has not yet issued any DML, then the V$TRANSACTION view won't show anything.

In this example below, I handle the exception to raise a user-defined application error. To defer to an existing exception handler, just do a SET TRANSACTION and then immediately COMMIT to undo it.

DECLARE     transaction_in_progress EXCEPTION;     PRAGMA EXCEPTION_INIT(transaction_in_progress, -1453); BEGIN     SET TRANSACTION NAME 'CHECK_FOR_TRANSACTION_ALREADY_SET';     COMMIT; -- end transaction EXCEPTION     WHEN transaction_in_progress THEN         RAISE_APPLICATION_ERROR(-20000,'Transaction is already in progress'); END; / 

回答7:

Matthew Watson can be modified to be used in RAC

select t.inst_id         ,s.sid       ,s.serial#       ,s.username       ,s.machine       ,s.status       ,s.lockwait       ,t.used_ublk       ,t.used_urec       ,t.start_time from gv$transaction t inner join gv$session s on t.addr = s.taddr; 

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