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Unlogged relations are reset at the end of crash recovery as they're only synced to disk during a proper shutdown. Unfortunately that and later steps can fail, e.g. due to running out of space. This reset was, up to now performed after marking the database as having finished crash recovery successfully. As out of space errors trigger a crash restart that could lead to the situation that not all unlogged relations are reset. Once that happend usage of unlogged relations could yield errors like "could not open file "...": No such file or directory". Luckily clusters that show the problem can be fixed by performing a immediate shutdown, and starting the database again. To fix, just call ResetUnloggedRelations(UNLOGGED_RELATION_INIT) earlier, before marking the database as having successfully recovered. Discussion: 20140912112246.GA4984@alap3.anarazel.de Backpatch to 9.1 where unlogged tables were introduced. Abhijit Menon-Sen and Andres Freund
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: http://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 http://www.postgresql.org/download/. For more information look at our web site located at http://www.postgresql.org/.