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| author | Amit Kapila | 2021-03-18 01:55:27 +0000 |
|---|---|---|
| committer | Amit Kapila | 2021-03-18 01:55:27 +0000 |
| commit | c8f78b616167bf8e24bc5dc69112c37755ed3058 (patch) | |
| tree | 71ba14ed3e7b3056581ef777f1675fba846ff64f /src/include/optimizer | |
| parent | 5f79580ad69f6e696365bdc63bc265f45bd77211 (diff) | |
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/include/optimizer')
| -rw-r--r-- | src/include/optimizer/cost.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/src/include/optimizer/cost.h b/src/include/optimizer/cost.h index 1be93be0983..22e6db96b62 100644 --- a/src/include/optimizer/cost.h +++ b/src/include/optimizer/cost.h @@ -47,6 +47,7 @@ typedef enum /* parameter variables and flags (see also optimizer.h) */ extern PGDLLIMPORT Cost disable_cost; extern PGDLLIMPORT int max_parallel_workers_per_gather; +extern PGDLLIMPORT bool enable_parallel_insert; extern PGDLLIMPORT bool enable_seqscan; extern PGDLLIMPORT bool enable_indexscan; extern PGDLLIMPORT bool enable_indexonlyscan; |