Re: Re: _wait_for_sync , dirty buffer flushing and direct reads in parallel

From: Yong Huang <yong321_at_yahoo.com>
Date: Thu, 20 Nov 2003 06:49:56 -0800
Message-ID: <F001.005D7440.20031120064956@fatcity.com>

The message I posted a minute ago may be wrong in one aspect.

> From what I read, _wait_for_sync when set to false means LGWR immediately
> notifies user (foreground) processes that redo record writes are done (even
> though they're not). When you say the parameter only affects LGWR, you need
> to clarify what you mean by "affect"; it changes the notification (posting)
> behavior of LGWR therefore changes the behavior of waiting processes (*when*
> they stop waiting). Just semantics.

Looks like it doesn't change the LGWR notification behavior. It just suppresses foreground processes' waiting for LGWR to write redo records.

Yong Huang

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Author: Yong Huang
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Received on Thu Nov 20 2003 - 08:49:56 CST