Re: breakable parse lock

From: K Gopalakrishnan <kaygopal_at_yahoo.com>
Date: Sun, 4 Jul 2004 22:33:28 -0700 (PDT)
Message-ID: <20040705053328.4848.qmail@web41502.mail.yahoo.com>

Syed:

Breakable parse locks are library cache locks (of enqueue types L[A-P]) which are held briefly during the compilation time/parsing time of SQL or PL/SQL codes. They are released at the end of the compilation/parsing. They are known as breakable parse locks as they are not released, and only can be broken when the object is un-pinned.

TM locks are held on tables during DDLs (like partition addition, Index Rebuilds, View creation on that table, PDML and Analyze) to protect (lock!) the definition of the table.

In short breakable parse locks are library cache locks and TM locks protect the definition of the table during DDLs.

Sultan Syed <ssyed_at_fine.ae> wrote:
> Hi,
> Can some one put light on this please,
> what is the difference between
> breakable parse lock and ddl lock(exclusive/shared)
>
> why there should be TM lock while
> exclusive ddl lock is auquired
>
> Thanks in advance
> Syed
>

Have a nice day !!

Best Regards,
K Gopalakrishnan,
Co-Author: Oracle Wait Interface: Oracle Press 2004. http://www.amazon.com/exec/obidos/tg/detail/-/007222729X/

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Received on Mon Jul 05 2004 - 00:30:07 CDT