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Object documentation DEVNO_BIT_COUNT Locate the document in its SAP Library structure

The special database parameter DEVNO_BIT_COUNT denotes the number of bits in the converter block address that is reserved for the logical device number of a data volume.

Default value: 8

Example

Size of a page: 8 KB
DEVNO_BIT_COUNT is set to 8
SAP DB can therefore manage 256 data volumes. Each data volume can have a maximum size of 128 GB.

Caution

The value that was set for DEVNO_BIT_COUNT when the database instance was installed should not be subsequently changed. If you change this database parameter during database operation, you must then recover the database instance to update the numbering of the data volumes.

Possible values for DEVNO_BIT_COUNT: 6 <= DEVNO_BIT_COUNT <= 12

The higher the value of the database parameter DEVNO_BIT_COUNT, the more data volumes can be managed. However, a high number of data volumes means the capacity of the individual data volumes is reduced.

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