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* HOT TOAST?
@ 2008-02-13 17:50 Josh Berkus <josh@agliodbs.com>
0 siblings, 1 reply; 3+ messages in thread
From: Josh Berkus @ 2008-02-13 17:50 UTC (permalink / raw)
To: pgsql-performance
Folks,
Does anyone know if HOT is compatible with pg_toast tables, or do TOASTed rows
simply get excluded from HOT? I can run some tests, but if someone knows
this off the top of their heads it would save me some time.
--
Josh Berkus
PostgreSQL @ Sun
San Francisco
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: HOT TOAST?
@ 2008-02-13 18:04 Tom Lane <tgl@sss.pgh.pa.us>
parent: Josh Berkus <josh@agliodbs.com>
0 siblings, 1 reply; 3+ messages in thread
From: Tom Lane @ 2008-02-13 18:04 UTC (permalink / raw)
To: Josh Berkus <josh@agliodbs.com>; +Cc: pgsql-performance
Josh Berkus <josh@agliodbs.com> writes:
> Does anyone know if HOT is compatible with pg_toast tables, or do TOASTed rows
> simply get excluded from HOT?
The current TOAST code never does any updates, only inserts/deletes.
But the HOT logic should be able to reclaim deleted rows early via
pruning.
regards, tom lane
^ permalink raw reply [nested|flat] 3+ messages in thread
* Re: HOT TOAST?
@ 2008-02-13 23:07 Josh Berkus <josh@agliodbs.com>
parent: Tom Lane <tgl@sss.pgh.pa.us>
0 siblings, 0 replies; 3+ messages in thread
From: Josh Berkus @ 2008-02-13 23:07 UTC (permalink / raw)
To: Tom Lane <tgl@sss.pgh.pa.us>; +Cc: pgsql-performance
Tom,
> The current TOAST code never does any updates, only inserts/deletes.
> But the HOT logic should be able to reclaim deleted rows early via
> pruning.
OK, so for a heavy update application we should still see a vacuum
reduction, even if most of the rows are 40k large?
Time to run some tests ...
--
--Josh
Josh Berkus
PostgreSQL @ Sun
San Francisco
^ permalink raw reply [nested|flat] 3+ messages in thread
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2008-02-13 17:50 HOT TOAST? Josh Berkus <josh@agliodbs.com>
2008-02-13 18:04 ` Tom Lane <tgl@sss.pgh.pa.us>
2008-02-13 23:07 ` Josh Berkus <josh@agliodbs.com>
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