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It has been project policy to create toast tables only for those catalogs that might reasonably need one. Since this judgment call can change over time, just create one for every catalog, as this can be useful when creating rather-long entries in catalogs, with recent examples being in the shape of policy expressions or customly-formatted SCRAM verifiers. To prevent circular dependencies and to avoid adding complexity to VACUUM FULL logic, exclude pg_class, pg_attribute, and pg_index. Also, to prevent pg_upgrade from seeing a non-empty new cluster, exclude pg_largeobject and pg_largeobject_metadata from the set as large object data is handled as user data. Those relations have no reason to use a toast table anyway. Author: Joe Conway, John Naylor Reviewed-by: Michael Paquier, Tom Lane Discussion: https://postgr.es/m/84ddff04-f122-784b-b6c5-3536804495f8@joeconway.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. 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/.