Re: Performance down with JDBC 42

On Sat, 2023-11-04 at 19:08 +0000, Abraham, Danny wrote:
> Asking for help with a JDBC related issue.
> Environment: Linux 7.9 PG 14.9 , very busy PG Server.
>
> A big query - 3 unions and about 10 joins runs :
> - 70ms on psql , DBeaver with JDBC 42 and in our Server using old JDBC 9.2
> - 2500 ms in our Server using new JDBC 42 driver. ( and this is running many times)
>
> Question: Is there a structured way to identify optimization setup ( Planner Method s ) changes?
> Are there any known changes specific to JDBC 42.

What I would do is enable auto_explain and look at the execution plan
when the statement is run by the JDBC driver. Then you can compare the
execution plans and spot the difference.

Yours,
Laurenz Albe