Media Database Structure

The Control‑M/Tape Media Database consists of the following primary physical files:

Table 223 Control-M/Tape Media Database Files

These files are managed by the IOA Access Method. For more information, see IOA Access Method.

Note: Another file, the Trace file, is used to track updates and facilitate recovery of the Media Database. (For more information, see Structure of the Trace File.)

The Data and Index files are allocated by Control‑M/Tape activities using the following DD statements:

Table 224 DD Statements for Allocating the Data and Index Files

Note: Because the user can define more than one Media Database extent and because the standard QSAM services cannot determine how many extents exist, you cannot read these files using these services. Instead, access the Media Database using only the standard macros described in Control-M/Tape Application Programming Interface.