Cache the results of ri_FetchConstraintInfo in a backend-local cache.

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Extracting data from pg_constraint turned out to take as much as 10% of the
runtime in a bulk-update case where the foreign key column wasn't changing,
because we did it over again for each tuple.  Fix that by maintaining a
backend-local cache of the results.  This is really a pretty small patch,
but converting the trigger functions to work with pointers rather than
local struct variables requires a lot of mechanical changes.

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This commit is contained in:

Tom Lane 2012-06-20 17:24:14 -04:00

parent cfa0f4255b

commit 45ba424f33

1 changed files with 319 additions and 229 deletions

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src/backend/utils/adt/ri_triggers.c

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