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AbortTransaction, which would lead to recursion and eventual PANIC exit as illustrated in recent report from Jeff Davis. First, in xact.c create a special dedicated memory context for AbortTransaction to run in. This solves the problem as long as AbortTransaction doesn't need more than 32K (or whatever other size we create the context with). But in corner cases it might. Second, in trigger.c arrange to keep pending after-trigger event records in separate contexts that can be freed near the beginning of AbortTransaction, rather than having them persist until CleanupTransaction as before. Third, in portalmem.c arrange to free executor state data earlier as well. These two changes should result in backing off the out-of-memory condition before AbortTransaction needs any significant amount of memory, at least in typical cases such as memory overrun due to too many trigger events or too big an executor hash table. And all the same for subtransaction abort too, of course.
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 including some of the more common listed below: C++ - http://thaiopensource.org/development/libpqxx/ JDBC - http://jdbc.postgresql.org ODBC - http://odbc.postgresql.org Perl - http://search.cpan.org/~dbdpg/ PHP - http://www.php.net Python - http://www.initd.org/ Ruby - http://ruby.scripting.ca/postgres/ Other language binding are available from a variety of contributing parties. PostgreSQL also has a great number of procedural languages available, a short but not complete list is below: PL/pgSQL - included in PostgreSQL source distribution PL/Perl - included in PostgreSQL source distribution PL/PHP - http://projects.commandprompt.com/projects/public/plphp PL/Python - included in PostgreSQL source distribution PL/Java - http://gborg.postgresql.org/project/pljava/projdisplay.php PL/Tcl - included in PostgreSQL source distribution 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. Changes between all PostgreSQL releases are recorded in the file HISTORY. 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/.