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If you create a table and don't insert any data into it, the relation file is never fsync'd. You don't lose data, because an empty table doesn't have any data to begin with, but if you crash and lose the file, subsequent operations on the table will fail with "could not open file" error. To fix, register an fsync request in mdcreate(), like we do for mdwrite(). Per discussion, we probably should also fsync the containing directory after creating a new file. But that's a separate and much wider issue. Backpatch to all supported versions. Reviewed-by: Andres Freund, Thomas Munro Discussion: https://www.postgresql.org/message-id/d47d8122-415e-425c-d0a2-e0160829702d%40iki.fi |
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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/.