For complete changes, please refer
http://dev.mysql.com/doc/refman/5.0/en/releasenotes-cs-5-0-67.html.
Here is a part of it.
Functionality added or changed:
Security Enhancement:
To enable stricter control over the location from which user-defined
functions can be loaded, the plugin_dir system variable has been
backported from MySQL 5.1. If the value is non-empty, user-defined
function object files can be loaded only from the directory named by this
variable. If the value is empty, the behavior that is used before 5.0.67
applies: The UDF object files must be located in a directory that is
searched by your system's dynamic linker. (Bug#37428)
Important Change: Incompatible Change:
The FEDERATED storage engine is now disabled by default in the .cnf files
shipped with MySQL distributions (my-huge.cnf, my-medium.cnf, and so
forth). This affects server behavior only if you install one of these
files. (Bug#37069)
Cluster API: Important Change:
Because NDB_LE_MemoryUsage.page_size_kb shows memory page sizes in bytes
rather than kilobytes, it has been renamed to page_size_bytes. The name
page_size_kb is now deprecated and thus subject to removal in a future
release, although it currently remains supported for reasons of backward
compatibility. See The Ndb_logevent_type Type, for more information about
NDB_LE_MemoryUsage. (Bug#30271)
Important Change:
Some changes were made to CHECK TABLE ... FOR UPGRADE and REPAIR TABLE
with respect to detection and handling of tables with incompatible .frm
files (files created with a different version of the MySQL server). These
changes also affect mysqlcheck because that program uses CHECK TABLE and
REPAIR table, and thus also mysql_upgrade because that program invokes
mysqlcheck.
* Added the SHOW PROFILES and SHOW PROFILE statements to display statement
profile data, and the accompanying INFORMATION_SCHEMA.PROFILING table.
* Added the Uptime_since_flush_status status variable, which indicates the
number of seconds since the most recent FLUSH STATUS statement.
* Incompatible change in DATE_FORMAT().
* NDB Cluster: The LockPagesInMainMemory configuration parameter has changed
its type and possible values.
* The bundled yaSSL library was upgraded to version 1.5.8.
* The --skip-thread-priority option now is enabled by default for binary Mac
OS X distributions. Use of thread priorities degrades performance on Mac OS X.
* Added the --disable-grant-options option to configure.
* Bug fixes.
Full listing of changes:
http://dev.mysql.com/doc/refman/5.0/en/news-5-0-21.html
Notable changes include:
- Security enhancement: Added the global max_prepared_stmt_count system
variable to limit the total number of prepared statements in the
server.
- The default for the innodb_thread_concurrency system variable was
changed to 8.
- Fixes for CVE-2006-1516, CVE-2006-1517 and CVE-2006-1518.
And a lot of bug fixes.
MySQL is a SQL (Structured Query Language) database server. SQL is the
most popular database language in the world. MySQL is a client-server
implementation that consists of a server daemon `mysqld' and many
different client programs/libraries.
The main goals of MySQL are speed and robustness.
The base upon which MySQL is built is a set of routines that have been
used in a highly demanding production environment for many years. While
MySQL is still in development it already offers a rich and highly useful
function set.
The official way to pronounce 'MySQL' is 'My Ess Que Ell' (Not MY-SEQUEL).
This package contains the MySQL client programs and libraries.
