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| author | Amit Kapila <akapila@postgresql.org> | 2021-03-18 07:25:27 +0530 |
|---|---|---|
| committer | Amit Kapila <akapila@postgresql.org> | 2021-03-18 07:25:27 +0530 |
| commit | c8f78b616167bf8e24bc5dc69112c37755ed3058 (patch) | |
| tree | 71ba14ed3e7b3056581ef777f1675fba846ff64f /src/backend/optimizer/path/costsize.c | |
| parent | 5f79580ad69f6e696365bdc63bc265f45bd77211 (diff) | |
| download | postgresql-c8f78b616167bf8e24bc5dc69112c37755ed3058.tar.gz | |
Add a new GUC and a reloption to enable inserts in parallel-mode.
Commit 05c8482f7f added the implementation of parallel SELECT for
"INSERT INTO ... SELECT ..." which may incur non-negligible overhead in
the additional parallel-safety checks that it performs, even when, in the
end, those checks determine that parallelism can't be used. This is
normally only ever a problem in the case of when the target table has a
large number of partitions.
A new GUC option "enable_parallel_insert" is added, to allow insert in
parallel-mode. The default is on.
In addition to the GUC option, the user may want a mechanism to allow
inserts in parallel-mode with finer granularity at table level. The new
table option "parallel_insert_enabled" allows this. The default is true.
Author: "Hou, Zhijie"
Reviewed-by: Greg Nancarrow, Amit Langote, Takayuki Tsunakawa, Amit Kapila
Discussion: https://postgr.es/m/CAA4eK1K-cW7svLC2D7DHoGHxdAdg3P37BLgebqBOC2ZLc9a6QQ%40mail.gmail.com
Discussion: https://postgr.es/m/CAJcOf-cXnB5cnMKqWEp2E2z7Mvcd04iLVmV=qpFJrR3AcrTS3g@mail.gmail.com
Diffstat (limited to 'src/backend/optimizer/path/costsize.c')
| -rw-r--r-- | src/backend/optimizer/path/costsize.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/src/backend/optimizer/path/costsize.c b/src/backend/optimizer/path/costsize.c index a25b674a19..c81e2cf244 100644 --- a/src/backend/optimizer/path/costsize.c +++ b/src/backend/optimizer/path/costsize.c @@ -129,6 +129,8 @@ Cost disable_cost = 1.0e10; int max_parallel_workers_per_gather = 2; +bool enable_parallel_insert = true; + bool enable_seqscan = true; bool enable_indexscan = true; bool enable_indexonlyscan = true; |