b85a9d046e
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. There are many places in lookup_type_cache() where syscache invalidation, user interruption, or even error could occur. In order to handle this, we keep an array of in-progress type cache entries. In the case of lookup_type_cache() interruption this array is processed to keep RelIdToTypeIdCacheHash in a consistent state. 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, Jian He, Alexander Lakhin Reviewed-by: Artur Zakirov
PostgreSQL Database Management System
This directory contains the source code distribution of the PostgreSQL database management system.
PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.
Copyright and license information can be found in the file COPYRIGHT.
General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.
The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.