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dbab0c07e5
The extra checks added by the recompression of toast data introduced in bbe0a81 is proving to have a performance impact on VACUUM or CLUSTER even if no recompression is done. This is more noticeable with more toastable columns that contain non-NULL values. Improvements could be done to make those extra checks less expensive, but that's not material for 14 at this stage, and we are not sure either if the code path of VACUUM FULL/CLUSTER is adapted for this job. Per discussion with several people, including Andres Freund, Robert Haas, Álvaro Herrera, Tom Lane and myself. Discussion: https://postgr.es/m/20210527003144.xxqppojoiwurc2iz@alap3.anarazel.de
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/.