Horton

Re: SIREAD lock versus ACCESS EXCLUSIVE lock

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Heikki Linnakangas <heikki.linnakangas@enterprisedb.com>
Cc: Kevin Grittner <Kevin.Grittner@wicourts.gov>, pgsql-hackers@postgresql.org, "<Simon Riggs" <simon@2ndquadrant.com>, Dan Ports <drkp@csail.mit.edu>
Date: 2011-06-04T16:19:04Z
Lists: pgsql-hackers 
Heikki Linnakangas <heikki.linnakangas@enterprisedb.com> writes:
> On 03.06.2011 21:04, Kevin Grittner wrote:
>> Also, if anyone has comments or hints about the placement of those
>> calls, I'd be happy to receive them.

> heap_drop_with_catalog() schedules the relation for deletion at the end 
> of transaction, but it's still possible that the transaction aborts and 
> the heap doesn't get dropped after all. If you put the 
> DropAllPredicateLocksFromTable() call there, and the transaction later 
> aborts, you've lost all the locks already.

But on the third thought: is that wrong?  Surely locks taken by an
aborted transaction can be discarded.

			regards, tom lane