Alvaro Herrera <alvherre@commandprompt.com> 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
