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This graphic is explained in the accompanying text Technical Restrictions Locate the document in its SAP Library structure

The following table lists the most important technical restrictions that apply to MaxDB database instances. There can be additional restrictions depending on the operating system that is used.

Technical restrictions for a database instance

Description

Maximum value

Number of data volumes

4096

(VOLUMENO_BIT_COUNT)

Size of a data volume

512 GB

Page size x (2 (32-VOLUMENO_BIT_COUNT)  )

Number of log volumes

No restriction

Size of a log volume

32 TB

Total size of the database instance (data area + log area)

64 TB

The database system accesses data pages in the data volumes using their converter block address. The converter block address is 32 bit long and consists of the volume number and the offset in the data volume. The larger you configure the VOLUMENO_BIT_COUNT special database parameter, the more data volumes can be used. The maximum permitted size of the individual data volumes is reduced accordingly. The following apply: 6 = VOLUMENO_BIT_COUNT = 12 and page size = 8 KB.

The database system regards the log area as a continuous array. It does not matter how many log volumes the log area consists of. As a rule, you first configure one log volume. If this log volume is too small, you can either increase the size of this log volume (requires the database instance to be restarted) or insert an additional log volume (this can be done in the ONLINE operational state).

 

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