Hi,
I have the book from Gaja & friends already, it's good THX.
I could trace with evnt 10046 but it won't reproduce anymore, everything is
peachy again (?)
Backups run every night (cold) and are used for cloning to test twice a
week.
I would look at all the views you suggest if I could only have it happen
again (but I'd be happy if it doesn't).
The fact that nothing changed to the oracle environment and still see a
change in behaviour also puzzled me.
I'm sure nothing happened because there is only two DBA's here and my
colleague was on leave for three weeks so I'm the only one with access to
production and have some privileges to do something. (developers can only
look at the production data because they also support the app)
Competing for resources may be a valid point but I can not find more than
one session on for the majority of the time (in the end users start coming
in)
and in short this session was doing a drop temp table, create temp table,
open two cursors, manipulate the data from the cursors (in sequence) and
fill a table with the data, close the cursors and ultimately drop the temp
table. Don't see much competing for the same block there
So I thank everybody that replied with suggestions and will check all of it
when it becomes reproducable.
Jack
"Johnson, Michael "
<Michael.Johnson@oln-a To: Multiple recipients of
list ORACLE-L <[EMAIL PROTECTED]>
fmc.af.mil> cc: (bcc: Jack van
Zanen/nlzanen1/External/MEY/NL)
Sent by: Subject: RE: Free Buffer Waits
[EMAIL PROTECTED]
19-06-2002 00:09
Please respond to
ORACLE-L
Obviously, you have something in your system competing for resources.
There are multiple sessions requesting the same block.
Everything seemed to run fine and now all of a sudden
things dont work , but nothing new has been introduced into the system.
How can this be ? Perhaps you have other problems that have been
created in the system in the last few days
that wont be seen until your backups are run.
It appears you are going to have to reproduce what you see
and log certain events while the bottleneck is happening.
I would set an event 10046 and comb through there ... I would
also try to look at v$session_wait which will show the file#,
clock# and id ( where id represents the status of the
buffer busy wait event ).
I would also buy Gaja Krishna Vaidyanatha and
Kirti Deshpande's book "Oracle Performance
Tuning 101" as it has been a big help to me.
Other things you might find helpful would be
www.hotsos.com which goes into great detail on the
10046 event trace and they also have an excellent
clinic I just went too.
Good Luck and Peace !
Mike
-----Original Message-----
Sent: Tuesday, June 18, 2002 12:43 AM
To: Multiple recipients of list ORACLE-L
Hi,
I came in early morning and saw the batch job had been taking forever.
I immediately checked v$system_event (the job that took so long had just
finished so session_wait was no longer option).
Since we shutdown and backup our database every night the figure presented
here was basically since the batch job started because that starts right
after startup. So basically the system (with no other logins as per
listener.ora file). had been waiting about 6-7 hours since startup on free
buffer waits.
We did not introduce any other jobs to the batch and it has been running
normally since that one time strange behaviour.
No logging of any hardware/software error was found on UNIX nor Symmetrix
nor Oracle so we have given up for now.
Jack
"Johnson, Michael "
<Michael.Johnson@oln-a To: Multiple
recipients of list ORACLE-L <[EMAIL PROTECTED]>
fmc.af.mil> cc: (bcc: Jack
van
Zanen/nlzanen1/External/MEY/NL)
Sent by: Subject: RE: Free
Buffer Waits
[EMAIL PROTECTED]
17-06-2002 19:28
Please respond to
ORACLE-L
Just a couple questions .....
Did you introduce any new batch jobs into the system or
any other interactive jobs that may have been running
at the same time ?
How do you know that the Buffer Wait event was the top
wait event and how did you see this ? eg. are you
taking a time slice and loggin it at certain time into
a 10046 trace ,etc.
Mike
-----Original Message-----
Sent: Thursday, June 13, 2002 2:04 AM
To: Multiple recipients of list ORACLE-L
Hi All,
We have a production database that has a batch job running on it for months
now. Last night one part of the batch job that normally takes between 20-30
minutes took well over 6 hours.
The only difference I can see between today & other days is that the Free
Buffer Wait event was the top wait event, which it not normally is (not
even top 10)
This database goes down every night for backup and this is the timings I
got.
Total waits:22055
Total timeouts:22052
Time waited: 2225285 (is this ms or cs?)
Avg.wait:100.8971
This whole thing puzzles me a bit since nothing changed to the database and
nothing was in the Alert log. Also system was virtually idle during the 6
hours (no activity according to UNIX boys)
I was sound asleep when this happened so I don't have much more than this
info.
Can anybody explain why this could have happened or point me to some
documents that can. Standard answer you'll find that your DBWR can't keep
up, but I have 4 of them and the sytem was idle.
THX
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