From: | Bruce Momjian <maillist(at)candle(dot)pha(dot)pa(dot)us> |
---|---|
To: | dg(at)illustra(dot)com (David Gould) |
Cc: | hackers(at)postgreSQL(dot)org (PostgreSQL-development) |
Subject: | Re: [HACKERS] Re: [QUESTIONS] Does Storage Manager support >2GB tables? |
Date: | 1998-03-14 17:15:46 |
Message-ID: | 199803141715.MAA14997@candle.pha.pa.us |
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Thread: | |
Lists: | pgsql-hackers |
> I have not had a chance yet to browse the postgres code, some silliness about
> my day job keeps interfering, so it may be a few weeks before I get to this.
>
> My thought is that comitting transactions can't release locks until the log
> is written. So, if the log is not flushed except every so often, locks are
> held longer harming concurrancy.
>
> Of course, I am probably thinking about "normal" WAL type transactions not
> the "unique" postgres log thing which truth to tell I may never have
> really understood.
You have good point here. We are telling an application that the
transaction is committed, even though if there is a crash in the next 10
seconds, on reboot, it will show it as not committed.
It is my understanding that all buffered logging database systems have
this problem, so I think we will just have to live with it. I believe
we will still continue to offer the original fsync() after commit
behavior.
--
Bruce Momjian | 830 Blythe Avenue
maillist(at)candle(dot)pha(dot)pa(dot)us | Drexel Hill, Pennsylvania 19026
+ If your life is a hard drive, | (610) 353-9879(w)
+ Christ can be your backup. | (610) 853-3000(h)
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