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Oracle 对数据文件大小的限制

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Jun 07, 2016 pm 04:52 PM

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Oracle数据文件的大小存在一个内部限制，这个限制是：每个数据文件最多只能包含2^22-1个数据块。这个限制也就直接导致了每个数据

Oracle数据文件的大小存在一个内部限制，这个限制是：

每个数据文件最多只能包含2^22-1个数据块。

这个限制也就直接导致了每个数据文件的最大允许大小。

在2K Block_size下，数据文件最大只能达到约8G

在32K的Block_size下，数据文件最大只能达到约16*8G的大小。

这个限制是由于Oracle的Rowid中使用22位来代表Block号，这22位最多只能代表2^22-1个数据块。

为了扩展数据文件的大小，Oracle10g中引入了大文件表空间，，在大文件表空间下，Oracle使用32位来代表Block号，也就是说，在新的技术下，大文件表空间下每个文件最多可以容纳4G个Block。那么也就是说当Block_size为2k时，数据文件可以达到8T。当block_size为32K时，数据文件可以达到128T。

当然这一限制和操作系统有关。

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