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Previously, the behavior of TidStoreCreate() was inconsistent between local and shared TidStore instances in terms of memory limitation. For local TidStore, a memory context was created with initial and maximum memory block sizes, as well as a minimum memory context size, based on the specified max_bytes values. However, for shared TidStore, the provided DSA area was used for TID storage. Although commit bb952c8c8b allowed specifying the initial and maximum DSA segment sizes, callers would have needed to clamp their own limits, which was not consistent and user-friendly. With this commit, when creating a shared TidStore, a dedicated DSA area is created for TID storage instead of using a provided DSA area. The initial and maximum DSA segment sizes are chosen based on the specified max_bytes. Other processes can attach to the shared TidStore using the handle of the created DSA returned by the new TidStoreGetDSA() function and the DSA pointer returned by TidStoreGetHandle(). The created DSA has the same lifetime as the shared TidStore and is deleted when all processes detach from it. To improve clarity, the TidStoreCreate() function has been divided into two separate functions: TidStoreCreateLocal() and TidStoreCreateShared(). Reviewed-by: John Naylor Discussion: https://postgr.es/m/CAD21AoAyc1j%3DBCdUqZfk6qbdjZ68UgRx1Gkpk0oah4K7S0Ri9g%40mail.gmail.com
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/.