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48f8eadffb
collector messages, per recent discussion on pgsql-patches. This actually required quite a few changes -- for example, "databaseid != InvalidOid" was used to check whether a slot in the backend entry table was initialized, but that no longer works since the slot might be initialized prior to receiving the BESTART message which contains the database id. We now use procpid > 0 to indicate that a slot is non-empty. Other changes: - various comment improvements and cleanups - there's no need to zero-out the entire activity buffer in pgstat_add_backend(), we can just set activity[0] to '\0'. - remove the counting of the # of connections to a database; this was not used anywhere One change in behavior I wasn't sure about: previously, the code would create a hash table entry for a database as soon as any message was received whose header referenced that database. Now, we only create hash table entries as needed (so for example BESTART won't create a database hash table entry, since it doesn't need to access anything in the per-db hash table). It would be easy enough to retain the old behavior, but AFAICS it is not required. |
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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. The JDBC, ODBC, C++, Python, and Tcl interfaces have been moved to the PostgreSQL Projects Web Site at http://gborg.postgresql.org for separate maintenance. A Perl DBI/DBD driver is available from CPAN. 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 ftp://ftp.postgresql.org/pub/. For more information look at our web site located at http://www.postgresql.org/.