For MVS, the minimum virtual memory requirements are 4700K for FOCUS, 200K for the data adapter, and the appropriate requirements for IDMS and its I/O buffers.
For VM/CMS, the minimum virtual machine requirements are 2700K for FOCUS, 200K for the data adapter, and the appropriate requirements for IDMS and its I/O buffers.
Note: It is recommended that 5000K be allocated for FOCUS in both MVS and VM/CMS.
Extra memory benefits FOCUS in that larger sorted reports can be generated entirely in memory without intermediate merge phases. The extra memory, however, has no impact on the retrieval efficiency.
Since IDMS treats FOCUS as an application program, all IDMS components, such as data sources, object-time subschemas, and executable IDMS software, must be specified for FOCUS to use.
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