Shut immediate problem

Question

Hi all,
I have problem while shutting down the database..
shutdown is in hang state and i got the below message in alert log
alertLog
Waiting for smon to disable tx recovery.
please suggest me the solution for the same

Answer 1

Hi,
According to Note:375935.1, this kind of situation is mostly caused by 2 things:
1. a large query running at the shutdown moment.
2. a large transaction running at the shutdown moment.
So, before issuing the shutdown immediate, it would be recommended to check the following views, especially when the database needs to be brought down for a very short period of time:
1. for large queries:
select count(*) from v$session_longops where time_remaining>0;
2. for large transactions:
select sum(used_ublk) from v$transaction;
1. For the large queries situation, when the shutdown immediate is hanging, you can just bring down the database using: shutdown abort, as the database could be easily brought to a consistent state by:
startup restrict followed by shutdown immediate.
One should take the backup and/or do whatever else need to be done after the shutdown immediate.
2. For the second situation, the workaround cannot be applied, especially when it's needed to take a cold backup. The database must be closed in a consistent state in order to do this and the consistent state cannot be achieved until all the transactions have completed one way or another (commit/rollback).
Cheers