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/.
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Simon Riggs
authored
When pg_logical_slot_get_changes(...) sets confirmed_flush_lsn to the point at which replay stopped, it doesn't dirty the replication slot. So if the replay didn't cause restart_lsn or catalog_xmin to change as well, this change will not get written out to disk. Even on a clean shutdown. If Pg crashes or restarts, a subsequent pg_logical_slot_get_changes(...) call will see the same changes already replayed since it uses the slot's confirmed_flush_lsn as the start point for fetching changes. The caller can't specify a start LSN when using the SQL interface. Mark the slot as dirty after reading changes using the SQL interface so that users won't see repeated changes after a clean shutdown. Repeated changes still occur when using the walsender interface or after an unclean shutdown. Craig Ringer
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