RE: Fun with WAIT Event "library cache: mutex X"

From: Herring Dave - dherri <>
Date: Fri, 9 Dec 2011 14:57:36 +0000
Message-ID: <>

On the much less important point you made about " It is only *4 GIGABYTES*. I'm getting about 170k download speed on my work network so......", are you usin wget? I found speeds much faster using this, plus it allows direct download to my server instead of going to PC, then PC to server. It also appears to be only available through the flash version of MOS.

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-----Original Message-----

From: [] On Behalf Of Taylor, Chris David Sent: Thursday, December 08, 2011 10:46 AM To: ''
Subject: Fun with WAIT Event "library cache: mutex X"

I'm running Patch 10 on Windows x64 and I have a pl/sql procedure that is rather simple, but kept erroring out after some time with an out memory condition. So, I decided to look and see what it is doing and it is encountering the "library cache: mutex X" event.

Browing Oracle Support, I found the note about it and it says:

  • "P3 = "where" = location in code (internal identifier) where mutex is being waited for _at_The meaning of the code for "where" can be found by looking in kgl0.h for entries with the prefix ""kglml_XXX". For example, if P3=2, then it corresponds to "kglml_kglget2". You can then search source code for this symbol to see where the mutex is acquired.

Well, that's not very helpful to me since I don't have access to the source code :) I understand that the engineers can use it.

Long story short, I decided to download the patchset.

It is only *4 GIGABYTES*. I'm getting about 170k download speed on my work network so......

Chris Taylor
Sr. Oracle DBA
Ingram Barge Company
Nashville, TN 37205

"Quality is never an accident; it is always the result of intelligent effort."
-- John Ruskin (English Writer 1819-1900)

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-- Received on Fri Dec 09 2011 - 08:57:36 CST

Original text of this message