| From: | "Imai, Yoshikazu" <imai(dot)yoshikazu(at)jp(dot)fujitsu(dot)com> |
|---|---|
| To: | 'Amit Langote' <Langote_Amit_f8(at)lab(dot)ntt(dot)co(dot)jp> |
| Cc: | David Rowley <david(dot)rowley(at)2ndquadrant(dot)com>, Alvaro Herrera <alvherre(at)2ndquadrant(dot)com>, Pg Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | RE: speeding up planning with partitions |
| Date: | 2019-01-21 00:45:18 |
| Message-ID: | 0F97FA9ABBDBE54F91744A9B37151A51259637@g01jpexmbkw24 |
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| Lists: | pgsql-hackers |
Hi Amit-san,
On Wed, Jan 17, 2019 at 10:25 AM, Amit Langote wrote:
> Thank you Imai-san for testing. Sorry it totally slipped my mind to reply to this email.
Thanks for replying and sorry for my late reply. I've been undertaking on-the-job training last week.
> Are you saying that, when using auto mode, all executions of the query
> starting from 7th are slower than the first 5 executions? That is, the
> latency of creating and using a custom plan increases *after* a generic
> plan is created and discarded on the 6th execution of the query? If so,
> that is inexplicable to me.
Yes. And it's also inexplicable to me.
I'll check if this fact is really correct by majoring the time of the
first 5 queries before generic plan is created and the other queries
after generic plan is created.
Yoshikazu Imai
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