TSR space

Releasing space when data is removed

The MT command will remove data from a table, leaving the table open with free space allocated. The table will continue to reserve some space in the TSR.

If you wish to completely release space when emptying a table, you must remove the table contents and definition with the CL command, and then redefine it with the DT command.

TSR Space Management

The space in the TSR is managed in 4K pages. Normally, space is allocated to table indexes and rows on a first-fit basis. As the TSR fills up, the space allocation algorithm is adjusted to decrease fragmentation. The adjustments to the algorithm are signaled by messages. There are also messages when the TSR usage exceeds certain thresholds, starting at 75% utilization.