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 DEVNO_BIT_COUNT 

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. The higher the setting 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.

The default is eight.

A page has 8 KB. DEVNO_BIT_COUNT is set to eight. This means that the database instance can manage 256 data volumes. Each data volume can have a maximum size of 128 GB.

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.

 

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