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This patch addresses a deficiency in the previous pg_stat_statements patch. We want to give sticky entries an initial "usage" factor high enough that they probably will stick around until their query is completed. However, if the query never completes (eg it gets an error during execution), the entry shouldn't persist indefinitely. Manage this by starting out with a usage setting equal to the (approximate) median usage value within the whole hashtable, but decaying the value much more aggressively than we do for normal entries. Peter Geoghegan |
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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. 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/.