Introduction › 64-bit Memory and MUF Data Buffers

64-bit Memory and MUF Data Buffers

CA Datacom Database Administrators benefit from using 64-bit memory for Multi-User Facility (MUF) data buffers. MUF data buffers are the set of buffers that the database region (MUF) uses to hold customer data blocks. The data buffer pool is one of the largest consumers of memory.

MUF data buffers default to 64-bit memory. MUF data buffer pools previously used 31-bit memory. A larger data buffer pool is allowed with 64-bit memory. A larger data buffer pool can enhance performance. 64-bit memory speeds processing by allowing 31-bit memory to be used for non-data buffer work. If, however, the 64-bit default is not wanted, a fifth parameter on the MUF startup option DATAPOOL allows the specification of 31-bit MUF data buffers.

Note: 31-bit memory is limited to a 2G maximum but is less than 2G in normal implementations. Availability of 64-bit memory in z/OS operating systems is significantly larger with a maximum 64-bit storage of 2 TB.