Library object/cache locks?

From: Walter K <ORA1034_at_sbcglobal.net>
Date: Fri, 27 Sep 2002 05:18:25 -0800
Message-ID: <F001.004DAE5B.20020927051825@fatcity.com>

Perhaps this is a rudimentary question but I haven't found any good info on this topic. Would someone please explain the difference between a library cache lock and a library cache pin?

Is the first simply a dictionary lock on a physical object (i.e. table) whereas the second is a dictionary lock on a piece of code (i.e. procedure, function, trigger)?

According to what I've read, I can query x$kgllk where kgllkreq=0 to find the library object locks in the database. How do I know if the lock is a library cache lock vs. a library cache pin, simply by inference due to the type of object?

If I perform a systemstate dump and see 'mode=S' under a process, does that mean that the process has a 'share' lock on the object? If so, I'm confused as to why I don't see a corresponding lock in v$lock.

Any info would be appreciated. Thanks VERY much in advance.

-Walt

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Author: Walter K
  INET: ORA1034_at_sbcglobal.net

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