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MySQL NDB Cluster API Developer Guide
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This type describes the storage type used by a Column object.

Description.  The storage type used for a given column can be either in memory or on disk. Columns stored on disk mean that less RAM is required overall but such columns cannot be indexed, and are potentially much slower to access. The default is StorageTypeMemory.

Enumeration values.  Possible values are shown, along with descriptions, in the following table:

Table 2.9 Column object StorageType data type values and descriptions

Name Description
StorageTypeMemory Store the column in memory
StorageTypeDisk Store the column on disk