Re: 7.0.3(nofsync) vs 7.1 - Mailing list pgsql-hackers

From Tom Lane
Subject Re: 7.0.3(nofsync) vs 7.1
Date
Msg-id 9343.976320878@sss.pgh.pa.us
Whole thread Raw
In response to 7.0.3(nofsync) vs 7.1  ("Mikheev, Vadim" <vmikheev@SECTORBASE.COM>)
List pgsql-hackers
"Mikheev, Vadim" <vmikheev@SECTORBASE.COM> writes:
> So, I've run simple test (below) to check this. Seems that 7.1
> is faster than 7.0.3 (nofsync), and that SELECT FOR UPDATE in RI
> triggers is quite bad for performance.
> Also, we should add new TODO item: implement dirty reads
> and use them in RI triggers.

That would fix RI triggers, I guess, but what about plain SELECT FOR
UPDATE being used by applications?

Why exactly is SELECT FOR UPDATE such a performance problem for 7.1,
anyway?  I wouldn't have thought it'd be a big deal...
        regards, tom lane


pgsql-hackers by date:

Previous
From: Tom Lane
Date:
Subject: Re: Hash index on macaddr -> crash
Next
From: Barry Lind
Date:
Subject: Bug in index scans with Locale support enabled