18.104.22.168 INSTALL PLUGIN Statement
INSTALL PLUGIN plugin_name SONAME 'shared_library_name'
This statement installs a server plugin. It requires the
INSERT privilege for the
mysql.plugin system table.
plugin_name is the name of the plugin as defined in the plugin descriptor structure contained in the library file (see Section 22.214.171.124, “Plugin Data Structures”). Plugin names are not case-sensitive. For maximal compatibility, plugin names should be limited to ASCII letters, digits, and underscore because they are used in C source files, shell command lines, M4 and Bourne shell scripts, and SQL environments.
shared_library_name is the name of the shared library that contains the plugin code. The name includes the file name extension (for example,
The shared library must be located in the plugin directory (the directory named by the
plugin_dir system variable). The library must be in the plugin directory itself, not in a subdirectory. By default,
plugin_dir is the
plugin directory under the directory named by the
pkglibdir configuration variable, but it can be changed by setting the value of
plugin_dir at server startup. For example, set its value in a
INSTALL PLUGIN loads and initializes the plugin code to make the plugin available for use. A plugin is initialized by executing its initialization function, which handles any setup that the plugin must perform before it can be used. When the server shuts down, it executes the deinitialization function for each plugin that is loaded so that the plugin has a chance to perform any final cleanup.
INSTALL PLUGIN also registers the plugin by adding a line that indicates the plugin name and library file name to the
mysql.plugin system table. At server startup, the server loads and initializes any plugin that is listed in
mysql.plugin. This means that a plugin is installed with
INSTALL PLUGIN only once, not every time the server starts. Plugin loading at startup does not occur if the server is started with the
A plugin library can contain multiple plugins. For each of them to be installed, use a separate
INSTALL PLUGIN statement. Each statement names a different plugin, but all of them specify the same library name.
INSTALL PLUGIN causes the server to read option (
my.cnf) files just as during server startup. This enables the plugin to pick up any relevant options from those files. It is possible to add plugin options to an option file even before loading a plugin (if the
loose prefix is used). It is also possible to uninstall a plugin, edit
my.cnf, and install the plugin again. Restarting the plugin this way enables it to the new option values without a server restart.
For options that control individual plugin loading at server startup, see Section 5.5.1, “Installing and Uninstalling Plugins”. If you need to load plugins for a single server startup when the
--skip-grant-tables option is given (which tells the server not to read system tables), use the
--plugin-load option. See Section 5.1.6, “Server Command Options”.
To remove a plugin, use the
UNINSTALL PLUGIN statement.
For additional information about plugin loading, see Section 5.5.1, “Installing and Uninstalling Plugins”.
If you recompile a plugin library and need to reinstall it, you can use either of the following methods:
UNINSTALL PLUGINto uninstall all plugins in the library, install the new plugin library file in the plugin directory, and then use
INSTALL PLUGINto install all plugins in the library. This procedure has the advantage that it can be used without stopping the server. However, if the plugin library contains many plugins, you must issue many
Stop the server, install the new plugin library file in the plugin directory, and restart the server.