Alvaro Herrera <[EMAIL PROTECTED]> writes:
> Tom Lane wrote:
>> We could make it cleaner by inventing a function to clear out the cached
>> statistics within a transaction, perhaps "pg_stat_reset_snaphot()" or
>> some such name.  If anyone thinks that that would be of general
>> usefulness, I'll see about making it happen.

> I came up with the idea of storing the stat hash in a particular memory
> context, and have a flag in pgstat.c that's reset when that context is
> reset.  So each caller can define what's the appropriate lifetime.

None of your use-cases require tracking multiple sets of stats within a
transaction, so I don't see why bother with that when we can just add a
"flush the stats" call.

                        regards, tom lane

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