PHP MySQL - Stilson.net

www.it-ebooks.infoCHAPTER 28 • MYSQL STORAGE ENGINES AND DATA TYPES• ENGINES: Stores information about available storage engines.• EVENTS: Stores information about scheduled events. Scheduled events are out ofthe scope of this book; consult the MySQL documentation for more information.• FILES: Stores information about NDB disk data tables. NDB is a storage enginethat is out of the scope of this book; consult the MySQL documentation for moreinformation.• GLOBAL_STATUS: Stores information about server status variables.• GLOBAL_VARIABLES: Stores information about server settings.• KEY_COLUMN_USAGE: Stores information about key column constraints.• PARTITIONS: Stores information about table partitions.• PLUGINS: Stores information about plug-ins, a feature new to MySQL 5.1 and out ofthe scope of this book. Consult the MySQL documentation for more information.• PROCESSLIST: Stores information about currently running threads.• PROFILING: Stores information about query profiles. You can also find thisinformation by executing the SHOW PROFILE and SHOW PROFILES commands.• REFERENTIAL_CONSTRAINTS: Stores information about foreign keys.• ROUTINES: Stores information about stored procedures and functions. See Chapter32 for more about this topic.• SCHEMATA: Stores information about the databases located on the server, such asthe database name and default character set.• SCHEMA_PRIVILEGES: Stores information about database privileges. Keep in mindthat this information is actually retrieved from the mysql.db table; however,retrieving it from this table offers the opportunity for additional uniformity whenquerying database properties. See Chapter 29 for more information about thistopic.• SESSION_STATUS: Stores information about the current session.• SESSION_VARIABLES: Stores information about the current session’s configuration.• STATISTICS: Stores information about each table index, such as the column name,whether it’s nullable, and whether each row must be unique.• TABLES: Stores information about each table, such as the name, engine, creationtime, and average row length.• TABLE_CONSTRAINTS: Stores information about table constraints, such as whether itincludes UNIQUE and PRIMARY KEY columns.• TABLE_PRIVILEGES: Stores information about table privileges. Keep in mind thatthis information is actually retrieved from the mysql.tables_priv table; however,retrieving it from this table offers the opportunity for additional uniformity whenquerying database properties. See Chapter 29 for more information.553