mirror of
https://github.com/postgres/postgres.git
synced 2026-02-27 11:50:33 -05:00
Base de données relationnelle
20cb18db46
If the hash table backing a catalog cache becomes too full (fillfactor > 2), enlarge it. A new buckets array, double the size of the old, is allocated, and all entries in the old hash are moved to the right bucket in the new hash. This has two benefits. First, cache lookups don't get so expensive when there are lots of entries in a cache, like if you access hundreds of thousands of tables. Second, we can make the (initial) sizes of the caches much smaller, which saves memory. This patch dials down the initial sizes of the catcaches. The new sizes are chosen so that a backend that only runs a few basic queries still won't need to enlarge any of them. |
||
|---|---|---|
| config | ||
| contrib | ||
| doc | ||
| src | ||
| .dir-locals.el | ||
| .gitignore | ||
| aclocal.m4 | ||
| configure | ||
| configure.in | ||
| COPYRIGHT | ||
| GNUmakefile.in | ||
| Makefile | ||
| README | ||
| README.git | ||
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/.