Re: Linear slow-down while inserting into a table with an ON INSERT trigger ?

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



Great idea ! This brought the time per INSERT into the parent table down to a consistent ~0.065ms again (compared to 0.05ms when completely removing the trigger, so penalty for the trigger is roughly ~20%).

On Sat, 17 Jul 2021 at 16:40, Justin Pryzby <pryzby@xxxxxxxxxxxxx> wrote:
You could run a single UPDATE rather than 30k triggers.
Or switch to an INSERT on the table, with an index on it, and call
max(last_parent_table_change) from whatever needs to ingest it.  And prune the
old entries and vacuum it outside the transaction.  Maybe someone else will
have a better suggestion.
Maybe just change the UPDATE statement to:

UPDATE data_sync SET last_parent_table_change=CURRENT_TIMESTAMP WHERE
last_parent_table_change <> CURRENT_TIMESTAMP;

That should reduce the number of actual updates to 1 per transaction.

David





[Postgresql General]     [Postgresql PHP]     [PHP Users]     [PHP Home]     [PHP on Windows]     [Kernel Newbies]     [PHP Classes]     [PHP Books]     [PHP Databases]     [Yosemite]

  Powered by Linux