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MyISAM
MyISAM was the default storage engine for the MySQL relational database management system versions prior to 5.5.〔http://dev.mysql.com/doc/refman/5.5/en/innodb-storage-engine.html〕 It is based on the older ISAM code, but it has many useful extensions. == Filesystem ==
Each MyISAM table is stored on disk in three files (if it is not partitioned). The files have names that begin with the table name and have an extension to indicate the file type. MySQL uses a .frm file to store the definition of the table, but this file is not a part of the MyISAM engine; instead it is a part of the server. The data file has a .MYD (MYData) extension. The index file has a .MYI (MYIndex) extension.
抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)』 ■ウィキペディアで「MyISAM」の詳細全文を読む
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