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Re: CheckpointStartLock starvation

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: Heikki Linnakangas <heikki(at)enterprisedb(dot)com>
Cc: PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: CheckpointStartLock starvation
Date: 2007-04-03 13:48:19
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Lists: pgsql-hackers
Heikki Linnakangas <heikki(at)enterprisedb(dot)com> writes:
> Tom Lane wrote:
>> Nor will that work for prepared xacts --- you don't want to wait for the
>> eventual commit, only for PREPARE TRANSACTION to exit its critical
>> section.

> PREPARE TRANSACTION wouldn't set the flag in MyProc; there's no clog 
> changes to protect from at that point. It would be set in 
> RecordTransactionCommitPrepared when we're really committing. Just like 
> we use the CheckpointStartLock today.

Indeed --- you'd better take another look at where we use the
CheckpointStartLock today.

			regards, tom lane

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