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We had a report from Stefan Kaltenbrunner of a case in which postmaster log files overran available disk space because multiple backends spewed enormous context stats dumps upon hitting an out-of-memory condition. Given the lack of similar reports, this isn't a common problem, but it still seems worth doing something about. However, we don't want to just blindly truncate the output, because that might prevent diagnosis of OOM problems. What seems like a workable compromise is to limit the dump to 100 child contexts per parent, and summarize the space used within any additional child contexts. That should help because practical cases where the dump gets long will typically be huge numbers of siblings under the same parent context; while the additional debugging value from seeing details about individual siblings beyond 100 will not be large, we hope. Anyway it doesn't take much code or memory space to do this, so let's try it like this and see how things go. Since the summarization mechanism requires passing totals back up anyway, I took the opportunity to add a "grand total" line to the end of the printout.
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/.