On Thu, 16 Oct 2025 at 05:24, Nathan Bossart <nathandbossart@gmail.com> wrote:
> I tried this with ignore_system_indexes = on, too, but it was very slow.
Seems to be due to pg_get_indexdef / pg_get_constraintdef operating on
a cold cat cache. Getting rid of those the rewritten version runs in
1.8 seconds with 100k tables for me.
That invalidates my timings from yesterday as I must have run the
rewritten query once the catcache was populated. Here are updated
results.
ignore_system_indexes = on 1.5k tables:
master: Execution Time: 26167.741 ms
rewritten: Execution Time: 16661.774 ms
ignore_system_indexes = off 1.5k tables:
master: Execution Time: 105.415 ms
rewritten: Execution Time: 97.030 ms
So not as good.
David
