On 2023-10-24 16:12, Étienne BERSAC wrote:
Hi,
Yeah, and when we have a situation where we want to run
pg_log_query_plan(), we can run it in any environment as long as it
is bundled with the core.
Is it possible to get the plan of a backend programmatically without
access to the logs?
Something like pg_get_query_plan(pid, format) which output would be the
same as EXPLAIN.
Do you imagine a function like below?
=# select pg_get_query_plan(100, 'plain');
QUERY PLAN
-------------------------------------------------------------------
Limit (cost=0.00..0.04 rows=1 width=273)
-> Seq Scan on pg_class (cost=0.00..17.14 rows=414 width=273)
If so, we once tried to implement such function for getting memory
contexts.
However, this attempt didn't succeed because it could lead dead lock
situation[1].
I think the same problem can occur when implementing
pg_get_query_plan().
[1]
https://www.postgresql.org/message-id/9a50371e15e741e295accabc72a41df1%40oss.nttdata.com
Regards,
Étienne BERSAC
Dalibo
--
Regards,
--
Atsushi Torikoshi
NTT DATA Group Corporation
