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We used to export snapshots unconditionally in CREATE_REPLICATION_SLOT in the replication protocol, but several upcoming patches want more control over what happens. Suppress snapshot export in pg_recvlogical, which neither needs nor can use the exported snapshot. Since snapshot exporting can fail this improves reliability. This also paves the way for allowing the creation of replication slots on standbys, which cannot export snapshots because they cannot allocate new XIDs. Author: Petr Jelinek <petr.jelinek@2ndquadrant.com> |
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README.git |
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/.