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TSS data set records

There are three types of records in a TSS data set:

  • Control records describe the TSS tables present in the data set. All table definitions must fit in a single control record. Each table definition is 96 bytes.
  • Index records are used to locate table records with as little I/O as possible. Each index record is itself a mini-tablewith an argument value representing the highest argument in each individual table block. The corresponding function is the relative block number of the table record. There can be more than one index record per table.
  • Table records contain the argument-function pairs. Entries are added to a table record until the record becomes full. When a record is full, the next time an entry is added to the table, the table is split in half before the ADD is performed. When a table record is split, a new entry is added to the index record representing the highest entry in the new table record.

Note

Do not perform data compression on any of the TSS data set records.


Related topic

Translate-Subsystem-Services-Tables


 

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