| From: | "tsunakawa(dot)takay(at)fujitsu(dot)com" <tsunakawa(dot)takay(at)fujitsu(dot)com> |
|---|---|
| To: | 'Dilip Kumar' <dilipbalaut(at)gmail(dot)com> |
| Cc: | Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, Bharath Rupireddy <bharath(dot)rupireddyforpostgres(at)gmail(dot)com>, Luc Vlaming <luc(at)swarm64(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Zhihong Yu <zyu(at)yugabyte(dot)com>, "houzj(dot)fnst(at)fujitsu(dot)com" <houzj(dot)fnst(at)fujitsu(dot)com>, "tanghy(dot)fnst(at)fujitsu(dot)com" <tanghy(dot)fnst(at)fujitsu(dot)com>, vignesh C <vignesh21(at)gmail(dot)com> |
| Subject: | RE: Parallel Inserts in CREATE TABLE AS |
| Date: | 2021-05-27 07:16:11 |
| Message-ID: | TYAPR01MB2990D6338A086A4A9D196AE1FE239@TYAPR01MB2990.jpnprd01.prod.outlook.com |
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From: Dilip Kumar <dilipbalaut(at)gmail(dot)com>
Basically you are creating a new table and loading data to it and that means you will be less likely to access those data soon so for such thing spoiling buffer cache may not be a good idea.
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Some people, including me, would say that the table will be accessed soon and that's why the data is loaded quickly during minimal maintenance hours.
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I was just suggesting only for experiments for identifying the root cause.
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I thought this is a good chance to possibly change things better (^^).
I guess the user would simply think like this: "I just want to finish CTAS as quickly as possible, so I configured to take advantage of parallelism. I want CTAS to make most use of our resources. Why doesn't Postgres try to limit resource usage (by using the ring buffer) against my will?"
Regards
Takayuki Tsunakawa
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