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FreeSpaceMapVacuumRange has the same effect, is more efficient if many pages are involved, and makes fewer assumptions about how it's used. Notably, Claudio Freire pointed out that UpdateFreeSpaceMap could fail if the specified freespace value isn't the maximum possible. This isn't a problem for the single existing user, but the function represents an attractive nuisance IMO, because it's named as though it were a general-purpose update function and its limitations are undocumented. In any case we don't need multiple ways to get the same result. In passing, do some code review and cleanup in RelationAddExtraBlocks. In particular, I see no excuse for it to omit the PageIsNew safety check that's done in the mainline extension path in RelationGetBufferForTuple. Discussion: https://postgr.es/m/CAGTBQpYR0uJCNTt3M5GOzBRHo+-GccNO1nCaQ8yEJmZKSW5q1A@mail.gmail.com |
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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/.