Hi,
On 2021-12-13 00:00:23 +0100, Gunnar "Nick" Bluth wrote:
> Regarding stats size; it adds one PgStat_BackendToastEntry
> (PgStat_BackendAttrIdentifier + PgStat_ToastCounts, should be 56-64 bytes or
> something in that ballpark) per TOASTable attribute, I can't see that make
> any system break sweat ;-)
That's actually a lot. The problem is that all the stats data for a database
is loaded into private memory for each connection to that database, and that
the stats collector regularly writes out all the stats data for a database.
> A quick run comparing 1.000.000 INSERTs (2 TOASTable columns each) with and
> without "pgstat_track_toast" resulted in 12792.882 ms vs. 12810.557 ms. So
> at least the call overhead seems to be neglectible.
Yea, you'd probably need a few more tables and a few more connections for it
to have a chance of mattering meaningfully.
Greetings,
Andres Freund
