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Avoid looping over all type cache entries in TypeCacheRelCallback()

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Currently when a single relcache entry gets invalidated,
TypeCacheRelCallback() has to loop over all type cache entries to find
appropriate typentry to invalidate.  Unfortunately, using the syscache here
is impossible, because this callback could be called outside a transaction
and this makes impossible catalog lookups.  This is why present commit
introduces RelIdToTypeIdCacheHash to map relation OID to its composite type
OID.

We are keeping RelIdToTypeIdCacheHash entry while corresponding type cache
entry have something to clean.  Therefore, RelIdToTypeIdCacheHash shouldn't
get bloat in the case of temporary tables flood.

Discussion: https://postgr.es/m/5812a6e5-68ae-4d84-9d85-b443176966a1%40sigaev.ru
Author: Teodor Sigaev
Reviewed-by: Aleksander Alekseev, Tom Lane, Michael Paquier, Roman Zharkov
Reviewed-by: Andrei Lepikhov, Pavel Borisov
This commit is contained in:
Alexander Korotkov
2024-08-25 03:21:23 +03:00
parent 3890d90c15
commit c14d4acb81
2 changed files with 232 additions and 44 deletions
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src/tools/pgindent/typedefs.list
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@@ -2377,6 +2377,7 @@ RelFileLocator
RelFileLocatorBackend
RelFileNumber
RelIdCacheEnt
RelIdToTypeIdCacheEntry
RelInfo
RelInfoArr
RelMapFile