Hi Nenad,
I can’t replicate on (windows) 19.7.0.1.200414, which RU are you on?
I just did explain plan for
Select distinct cols from tab_a join (select /*+no_merge*/distinct cols
from tab_b) join on col_a where tab_a.col_b = :x
It took 5 seconds to return but I got a view pushed predicate. Without the
no_merge, it just merges so nothing to push into.
Is my demo case similar enough to yours?
Thanks,
Andy
On Fri, 4 Sep 2020 at 11:20, Noveljic Nenad <nenad.noveljic@xxxxxxxxxxxx>
wrote:
Has anybody else seen this in 19c: "JPPD bypassed: DISTINCT clause" ?
The optimizer doesn’t push a predicate into the DISTINCT view in 19.7
anymore, but used to do it in 12.2.
I’ve already applied
*30786641 : QUERY PERFORMANCE REGRESSION AFTER UPGRADING FROM 11.2.0.4 TO
19.5*.,
but to no avail.
Best regards,
Nenad
https://nenadnoveljic.com/blog
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