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If the system crashed between CREATE TABLESPACE and the next checkpoint, the result could be some files in the tablespace unexpectedly containing no rows. Affected files would be those for which the system did not write WAL; see the wal_skip_threshold documentation. Before v13, a different set of conditions governed the writing of WAL; see v12's <sect2 id="populate-pitr">. (The v12 conditions were broader in some ways and narrower in others.) Users may want to audit non-default tablespaces for unexpected short files. The bug could have truncated an index without affecting the associated table, and reindexing the index would fix that particular problem. This fixes the bug by making create_tablespace_directories() more like TablespaceCreateDbspace(). create_tablespace_directories() was recursively removing tablespace contents, reasoning that WAL redo would recreate everything removed that way. That assumption holds for other wal_level values. Under wal_level=minimal, the old approach could delete files for which no other copy existed. Back-patch to 9.6 (all supported versions). Reviewed by Robert Haas and Prabhat Sahu. Reported by Robert Haas. Discussion: https://postgr.es/m/CA+TgmoaLO9ncuwvr2nN-J4VEP5XyAcy=zKiHxQzBbFRxxGxm0w@mail.gmail.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/.