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This elevel is useful for logging audit messages and similar information that should not be passed to the client. It's equivalent to LOG in terms of decisions about logging priority in the postmaster log, but messages with this elevel will never be sent to the client. In the current implementation, it's just an alias for the longstanding COMMERROR elevel (or more accurately, we've made COMMERROR an alias for this). At some point it might be interesting to allow a LOG_ONLY flag to be attached to any elevel, but that would be considerably more complicated, and it's not clear there's enough use-cases to justify the extra work. For now, let's just take the easy 90% solution. David Steele, reviewed by Fabien Coelho, Petr Jelínek, and myself
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/.