Re: Exclusive Unix file system file write locks and Oracle and Veritas

From: Jonathan Lewis <jonathan_at_jlcomp.demon.co.uk>
Date: Fri, 10 Sep 1999 23:30:52 +0100
Message-ID: <937003226.911.1.nnrp-01.9e984b29@news.demon.co.uk>

Oracle uses OD_SYNC to do writes - which means the write goes through the cache to the file.

When the write takes place there is an exclusive lock placed on the inode entry for the duration of the write.

Jonathan Lewis
Yet another Oracle-related web site: http://www.jlcomp.demon.co.uk

Thiru wrote in message <37D95689.BBB547F2_at_excite.com>...
>Could you Pls Clarify the statement ' writers lock Readers and readers
>lock writers on the inode level in UFS ' ?
>
>UFS uses File Buffer Cache which provides Read Consistent Data(similar to
>ORacle) and they dont lock the entire Inode..
>
>-Thiru
>
>Jonathan Lewis wrote:
>
>> Under Unix file system, writers lock readers and readers lock
>> writers independently of anything that Oracle is doing. The
>> lock is on the inode to ensure that a read cannot read data
>> that is changing.
Received on Fri Sep 10 1999 - 17:30:52 CDT