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Re: some problems when i use postgresql 8.4.2 in my projects .

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: wyx6fox(at)sina(dot)com
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: some problems when i use postgresql 8.4.2 in my projects .
Date: 2010-02-03 14:58:18
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
2010/2/2  <wyx6fox(at)sina(dot)com>:
>  the unique constraints actualy kill concurrency write transaction when
> concurrency insert violate the unique constraints , they block each other ,
> i test this in oracle10g, has the same behavour. I think this may be
> reasonable because the uqniue check must be  the seriazable check .
> for resolve this problem , i do the unique check in application as possible
> , but in big concurrency env , this is not good way .

You may find that your way isn't actually very reliable, and that
making it reliable will be very, very much harder (and likely no
faster) than letting PostgreSQL do it.


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