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5.5.1 Installing and Uninstalling Components

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Server components must be loaded into the server before they can be used. MySQL supports component loading at runtime.

The INSTALL COMPONENT and UNINSTALL COMPONENT SQL statements enable component loading and unloading. For example:

  1. INSTALL COMPONENT 'file://component_validate_password';
  2. UNINSTALL COMPONENT 'file://component_validate_password';

A loader service handles component loading and unloading, and also lists loaded components in the component table of the mysql system database that serves as a registry.

The SQL statements for component manipulation affect server operation and the mysql.component system table as follows:

  • INSTALL COMPONENT loads components into the server. The components become active immediately. The loader service also registers loaded components in the mysql.component system table. For subsequent server restarts, the loader service loads any components listed in mysql.component during the startup sequence. This occurs even if the server is started with the --skip-grant-tables option.

  • UNINSTALL COMPONENT deactivates components and unloads them from the server. The loader service also unregisters the components from the mysql.component system table so that they are no longer loaded during the startup sequence for subsequent server restarts.

Compared to the corresponding INSTALL PLUGIN statement for server plugins, the INSTALL COMPONENT statement for components offers the significant advantage that it is not necessary to know any platform-specific file name suffix for naming the component. This means that a given INSTALL COMPONENT statement can be executed uniformly across platforms.


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Document created the 26/06/2006, last modified the 26/10/2018
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References

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