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recent proposal. In typical cases, we now need 12 bytes per insert or delete event and 16 bytes per update event; previously we needed 40 bytes per event on 32-bit hardware and 80 bytes per event on 64-bit hardware. Even in the worst case usage pattern with a large number of distinct triggers being fired in one query, usage is at most 32 bytes per event. It seems to be a bit faster than the old code as well, due to reduction of palloc overhead. This commit doesn't address the TODO item of allowing the event list to spill to disk; rather it's trying to stave off the need for that. However, it probably makes that task a bit easier by reducing the data structure's dependency on pointers. It would now be practical to dump an event list to disk by "chunks" instead of individual events. |
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| COPYRIGHT | ||
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| README | ||
| README.CVS | ||
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/.