MySQL supports a plugin API that enables creation of server
components. Plugins can be loaded at server startup, or loaded and
unloaded at runtime without restarting the server. The components
supported by this interface include, but are not limited to,
full-text parser plugins, partitioning support, and server
MySQL distributions include several plugins that implement server extensions:
Plugins for authenticating attempts by clients to connect to MySQL Server. Plugins are available for several authentication protocols. See Section 6.3.8, “Pluggable Authentication”.
A password-validation plugin for implementing password strength policies and assessing the strength of potential passwords. See Section 18.104.22.168, “The Password Validation Plugin”.
Semisynchronous replication plugins implement an interface to replication capabilities that permit the master to proceed as long as at least one slave has responded to each transaction. See Section 17.3.8, “Semisynchronous Replication”.
A query rewrite plugin that examines statements received by MySQL Server and possibly rewrites them before the server executes them. See Section 22.214.171.124, “The Rewriter Query Rewrite Plugin”
Version Tokens is a feature that enables creation of and
synchronization around server tokens that applications can use
to prevent accessing incorrect or out-of-date data. Version
Tokens is based on a plugin library that implements a
version_tokens plugin and a set of
user-defined functions. See Section 126.96.36.199, “Version Tokens”.
The following sections describe how to install and uninstall plugins, and how to determine at runtime which plugins are installed and obtain information about them. For information about writing plugins, see Section 23.2, “The MySQL Plugin API”.