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VACUUM FULL and CLUSTER can be used to enforce the use of the existing compression method of a toastable column if a value currently stored is compressed with a method that does not match the column's defined method. The code in charge of decompressing and recompressing toast values at rewrite left around the detoasted values, causing an accumulation of memory allocated in TopTransactionContext. When processing large relations, this could cause the system to run out of memory. The detoasted values are not needed once their tuple is rewritten, and this commit ensures that the necessary cleanup happens. Issue introduced by bbe0a81d. The comments of the area are reordered a bit while on it. Reported-by: Andres Freund Analyzed-by: Andres Freund Author: Michael Paquier Reviewed-by: Dilip Kumar Discussion: https://postgr.es/m/20210521211929.pcehg6f23icwstdb@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/.