| From: | "tsunakawa(dot)takay(at)fujitsu(dot)com" <tsunakawa(dot)takay(at)fujitsu(dot)com> |
|---|---|
| To: | "tanghy(dot)fnst(at)cn(dot)fujitsu(dot)com" <tanghy(dot)fnst(at)cn(dot)fujitsu(dot)com> |
| Cc: | 'Amit Kapila' <amit(dot)kapila16(at)gmail(dot)com>, Greg Nancarrow <gregn4422(at)gmail(dot)com>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, vignesh C <vignesh21(at)gmail(dot)com>, Bharath Rupireddy <bharath(dot)rupireddyforpostgres(at)gmail(dot)com>, Andres Freund <andres(at)anarazel(dot)de>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>, Antonin Houska <ah(at)cybertec(dot)at> |
| Subject: | RE: Parallel INSERT (INTO ... SELECT ...) |
| Date: | 2021-01-18 00:57:19 |
| Message-ID: | OSBPR01MB29823755AC1E0A21D4CD736DFEA40@OSBPR01MB2982.jpnprd01.prod.outlook.com |
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| Lists: | pgsql-hackers |
Hello Tang-san,
From: Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>
> Can we test cases when we have few rows in the Select table (say 1000)
> and there 500 or 1000 partitions. In that case, we won't select
> parallelism but we have to pay the price of checking parallel-safety
> of all partitions. Can you check this with 100, 200, 500, 1000
> partitions table?
I also wanted to see such an extreme(?) case. The 1,000 rows is not the count per partition but the total count of all partitions.e.g., when # of partitions is 100, # of rows per partition is 10.
Regards
Takayuki Tsunakawa
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