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Up to now, the ID values returned by pg_stat_get_backend_idset() and used by pg_stat_get_backend_activity() and allied functions were just indexes into a local array of sessions seen by the last stats refresh. This is problematic for a few reasons. The "ID" of a session can vary over its existence, which is surprising. Also, while these numbers often match the "backend ID" used for purposes like temp schema assignment, that isn't reliably true. We can fairly cheaply switch things around to make these numbers actually be the sessions' backend IDs. The added test case illustrates that with this definition, the temp schema used by a given session can be obtained given its PID. While here, delete some dead code that guarded against getting a NULL return from pgstat_fetch_stat_local_beentry(). That can't happen as long as the caller is careful to pass an in-range array index, as all the callers are. (This code may not have been dead when written, but it surely is now.) Nathan Bossart Discussion: https://postgr.es/m/20220815205811.GA250990@nathanxps13 |
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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. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download/ See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.