From: | Mike Mascari <mascarm(at)mascari(dot)com> |
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To: | Stephen Frost <sfrost(at)snowman(dot)net> |
Cc: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, andrew(at)supernews(dot)com, pgsql-hackers(at)postgresql(dot)org |
Subject: | Re: Must be owner to truncate? |
Date: | 2005-07-09 13:47:50 |
Message-ID: | 42CFD586.5060003@mascari.com |
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Lists: | pgsql-hackers |
Stephen Frost wrote:
> delete from x;/truncate x;
> --> Creates a new, empty, file and makes it the 'current' file
> --> Marks the old file for deletion, but it is kept around for any
> transactions which were started before the truncate;
> --> New transactions use the empty file
> --> Once all transactions using the old file have completed, the old
> file can be deleted.
> --> Old transactions which insert rows would need to use the new file
> or scan the old file for rows which they added, I suppose.
And when the transaction that issued the TRUNCATE aborts after step 3,
but newer transactions commit?
Mike Mascari
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