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MYSQL课程:数据表最大尺寸限制

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Jun 07, 2016 pm 04:16 PM

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MYSQL教程:数据表最大尺寸限制

        MySQL数据表类型的不同对数据表尺寸的限制：

        ISAM数据表中单个.ISD和.ISM文件的最大尺寸为4G；

        MyISAM数据表中单个.MYD和.MYI文件的默认最大尺寸也是4G，但可在创建数据表时用AVG_ROW_LENGTH和MAX_ROWS选项把这个最值扩大到800万TB。

        MERGE数据表的最大尺寸是它的各组成MyISAM数据表的最大尺寸之和。

        BDB数据表的尺寸受限于BDB处理程序所允许的.db文件的最大尺寸。这个最大尺寸随着数据表页面尺寸(编译时确定)而变化，但即使是最小的页面尺寸(512字节)，.db文件的最大尺寸也可达2TB。

        InnoDB数据表的表空间的最大尺寸是40亿个页面，默认的页面尺寸是16K，该值可在8K到64K之间，在编译时确定。InnoDB数据表的最大尺寸也就是表空间的最大尺寸。

    操作系统对文件的尺寸限制，一般文件系统都对单个文件不得超过2G的限制。该约束会对数据库文件造成限制。InnoDB数据表可通过利用未格式化硬盘作为表空间来绕过该限制。

    对于数据和索引分开两个文件存放的数据表，其中任何一个文件达到操作系统文件的最大限制，数据库表也就达到最大尺寸。

    包含AUTO_INCREMENT数据列的表受到该数据列类型最大上限值的限制。

    由于InnoDB数据表用表空间来管理，一个表空间可同时空纳多个数据表，所以数据表的最大尺寸受系统文件和同一表空间中数据表空间的约束。

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