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Re: [HACKERS] The dangers of "-F"

From: Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us>
To: Zeugswetter Andreas IZ5 <Andreas(dot)Zeugswetter(at)telecom(dot)at>
Cc: pgsql-hackers(at)postgreSQL(dot)org
Subject: Re: [HACKERS] The dangers of "-F"
Date: 1999-06-24 15:42:36
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
> > For instance, if there are assumptions that all data blocks are
> > written before this fact is recorded in a log file, then
> > "write data blocks" "fsynch" "write log" "fsynch" doesn't break
> > that assumption, 
> > 
> Are we really doing a sync after the pg_log write ? While the sync
> after datablock write seems necessary to guarantee consistency,
> the sync after log write is actually not necessary to guarantee consistency.
> Would it be a first step, to special case the writing to pg_log, as
> to not sync (extra switch to backend) ? This would avoid the syncs
> for read only transactions, since they don't cause data block writes.

You are right.  We don't need a sync after the pg_log write.

  Bruce Momjian                        |
  maillist(at)candle(dot)pha(dot)pa(dot)us            |  (610) 853-3000
  +  If your life is a hard drive,     |  830 Blythe Avenue
  +  Christ can be your backup.        |  Drexel Hill, Pennsylvania 19026

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