One more thing: the OP did not mention the platform.
On windows, there's an interesting thing that happens in a CMD window when doing shutdown immediate.
The shutdown will appear to hang. It may go on quite awhile.
Try hitting the <ENTER> key in this situation.
The CMD window will hang, and will not respond until hitting <ENTER>.
It is not consistent behavior, but is also not unusual (happened to me last week)
I've read the explanation of why this happens, but cannot recall what it is.
I agree with the other members who responded that probably it's just a case of SMON having to do a lot of work - and not using old-school tablespace types. There is one other possibility perhaps: The ugly, old bug w.r.t. memory leaking and Shutdown immediate just hanging. I think the usual workaround still works:
event="10262 trace name context forever, level 0"
Again, it's probably just a completely normal thing you're seeing, but it MIGHT be the bug rearing its head again.
Ahmed Ullah wrote:
We have Oracle 18.104.22.168 database ( single Note RAC ). There were some heavy batch jobs running which cuased the db hang ( only sys connection was working ).
We tried to bring down the database after cleaning all sessions. It did not go down with SHUTDOWN IMMEDIATE. We had to abort it. I tried to bring down the DB three times with SHUTDOWN IMMEDIATE it never went down.
SMON was trying to cleanup the used extents ( Metalink Note – *1076161.6*) as we could see in the alert log file - *Waiting for smon to disable tx recovery*.
SQL> select count(block#) from fet$;
COUNT(BLOCK#) ------------- 38
fet$ - free extents
SQL> select count(block#) from uet$;
COUNT(BLOCK#) ------------- *52905*
uet$ - used extents
We can share the alert log and system level 10 trace files if anyone wants. These traces were generated when db hung.
Appreciate your help.
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