Re: table locking

From: Bruce Momjian <pgman(at)candle(dot)pha(dot)pa(dot)us>
To: me(at)shanewright(dot)co(dot)uk
Cc: pgsql-sql(at)postgresql(dot)org
Subject: Re: table locking
Date: 2002-02-18 15:34:13
Message-ID: 200202181534.g1IFYDP19471@candle.pha.pa.us
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Shane Wright wrote:
> Hi Bruce
>
> Thanks for the information (and the book link, straight in the bookmarks and
> remembered for an Amazon search...)
>
> Anyway, the chapter was helpful, but I'm still stuck. SERIALIZABLE looks
> like it would do the job, but I don't want any queries to fail/rollback - I'd
> rather they stalled on SET TRANSACTION or LOCK TABLE until the first was
> complete.
>
> Is this possible?
>
> I am also assuming that even with SERIALIZABLE, concurrent SELECTs can
> proceed unhindered?

Actually, I think the default READ COMMITTED will work fine for you.
Backends will block waiting for your write, then continue when you
commit, and reads will not be affected. I am not totally sure what you
are testing, so I suggest starting two psql sessions and trying it.

--
Bruce Momjian | http://candle.pha.pa.us
pgman(at)candle(dot)pha(dot)pa(dot)us | (610) 853-3000
+ If your life is a hard drive, | 830 Blythe Avenue
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