gtpi1m6aSystem Installation Support Reference

Record ID Attribute Table

The record ID attribute table (RIAT) is used to describe the characteristics of both fixed and pool file records. Characteristics of fixed file IDs include: exception recording, logging, and restoring status, user exit status, VFA candidacy, locking status, and record caching candidacy. These characteristics also apply to pool file IDs. Pool file IDs have these additional characteristics: size, duration, duplication status, and device type. These characteristics can be specified for any of the 10 record categories (labeled 0-9) for a specific record ID.

The 10 pool record categories are available to application programmers for more efficient utilization of disk space. Each record category should have unique attributes for size, pool, and device. For example, record category 0 (RTP0) could be designated as size=L (large), pool=LT (long term, nonduplicated), and device=A (DEVA). No other record category (RTP1 -- RTP9) would have these same attributes.

Every RIAT-controlled record has a 2-byte record ID, a 16-bit combination ranging from 256 to 64 511, associated with it. The TPF system reserves the record IDs in the range 1-255 and 64 512-65 535, for its own use, and record ID 0 is considered to be invalid.

In an MDBF environment each subsystem requires its own RIAT.

If multiple TPF images are defined, each image can have its own unique RIAT.