How do I the interpret "Disk file operations I/O" wait event?

I have a large and very busy batch database. All of a sudden the "Disk file operations I/O" wait event is in the top 5 in AWR.
The manual page isn't very helpful:
http://download.oracle.com/docs/cd/E11882_01/server.112/e17110/waitevents003.htm#insertedID40
Disk file operations I/O
This event is used to wait for disk file operations (for example, open, close, seek, and resize). It is also used for miscellaneous I/O operations such as block dumps and password file accesses.
So here is my question: What exactly is going on when I see this wait event? Why doesn't it show up as one of the other I/O events? Can I make it go away? Should I make it go away?
DR

sb92075 wrote:
All of a sudden the "Disk file operations I/O" wait event is in the top 5 in AWR.Top wait event
In EVERY Top Wait Event list, one wait event will ALWAYS be on top as #1; by definition of the list.
Simply because any item, even #1, appears on this list does not mean this is a problem & needs to be fixed.
If the Top Wait Event accounts for only 5 seconds out of a 1 hour sample,
then reducing it to ZERO won't measurably improve overall application performance.
The actual Time Waited is required to determine if it is a problem or not.It's taking 20% of time in a 15 minute sample. Anything that takes 20% of deserves to be understood....So: What actually causes it?
DR

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Disk file operations I/O waits

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I have a production database running 11.2.0.3 on a Windows server.
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When I take a look at the AWR report we have "DIsk file operations I/O" waits for 30% of the DBTime.
Checking the AWR for last week we had no such waits.
The disks are on SAN. and the SAN guys can not see any problems so far.
Any suggestions? Why do we suddenly have these kind of waits??
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954496 wrote:
Hi,
I have a production database running 11.2.0.3 on a Windows server.
It has been running for about a year without problems, but today we experiences big performance problems.
Quantify "big"?
Is every SQL slow?
Even manual SQL issued outside of the application?
Consider providing us details as enumerated in URL below.
How do I ask a question on the forums?
Search for "related documents" as Altavista or Google do it?
Handle:     954496
Status Level:     Newbie
Registered:     Aug 23, 2012
Total Posts:     12
Total Questions:     4 (4 unresolved)
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