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## Object Information System Tables 

These system tables contain information about components, loadable functions, and server-side plugins: 

• component : The registry for server components installed using INSTALL COMPONENT . Any components listed in this table are installed by a loader service during the server startup sequence. See Section 5.5.1, “Installing and Uninstalling Components” . 

• func : The registry for loadable functions installed using CREATE FUNCTION . During the normal startup sequence, the server loads functions registered in this table. If the server is started with the --skip- grant-tables  option, functions registered in the table are not loaded and are unavailable. See Section 5.7.1, “Installing and Uninstalling Loadable Functions” . 

<img src='content_image/699839.jpg'>

## Note 

Like the mysql.func  system table, the Performance Schema user_defined_functions  table lists loadable functions installed using CREATE FUNCTION . Unlike the mysql.func  table, the user_defined_functions  table also lists functions installed automatically by server components or plugins. This difference makes user_defined_functions  preferable to mysql.func  for checking which functions are installed. See Section 27.12.21.8, “The user_defined_functions Table” . 

• plugin : The registry for server-side plugins installed using INSTALL PLUGIN . During the normal startup sequence, the server loads plugins registered in this table. If the server is started with the -- skip-grant-tables  option, plugins registered in the table are not loaded and are unavailable. See Section 5.6.1, “Installing and Uninstalling Plugins” . 

## Log System Tables 

## Server-Side Help System Tables 

## Time Zone System Tables 

The server uses these system tables for logging: 

• general_log : The general query log table. 

• slow_log : The slow query log table. 

Log tables use the CSV  storage engine. 

For more information, see Section 5.4, “MySQL Server Logs” . 

These system tables contain server-side help information: 

• help_category : Information about help categories. 

• help_keyword : Keywords associated with help topics. 

• help_relation : Mappings between help keywords and topics. 

• help_topic : Help topic contents. 

For more information, see Section 5.1.17, “Server-Side Help Support” . 

These system tables contain time zone information: 

