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The CTTSTK utility builds and updates the Stacking database. Run the utility on a regular basis using the CTTDAY job.
The utility accepts input from one of the following three types of data sets:
The purposes, advantages, and disadvantages of using Media database and Trace file input are described in the table below. SMF type 15 records can be used to supplement Trace file input, if necessary, to decrease the time required to accumulate comprehensive statistics in the Statistics database.
Table 383 CTTSTK Media database and Trace file
|
Media database |
Trace file (and SMF type 15 records) |
|---|---|---|
Purpose |
To load the Stacking database when installing the Dynamic Dataset Stacking facility. |
To update the Stacking database with the latest statistics on a daily basis. |
Advantages |
The Stacking database has statistics for most data sets. |
All statistics transferred to the Stacking database are accurate and up-to-date. |
Disadvantages |
Some data transferred to the Stacking database comes from scratched data set records. This data may be inaccurate and out-of-date. |
When the Trace file is full, its oldest records are overwritten. Consequently, only statistics for recently used data sets are transferred to the Stacking database. It may require several updates for the Stacking database to accumulate comprehensive statistics. |
Input records can be selected according to INCLUDE / EXCLUDE statements supplied to the utility. Record timestamps are inserted in the data set. Records from different utility runs with earlier timestamps are considered duplicate records and are dropped. Therefore, records with overlapping timestamps from different source computers must not be supplied to the utility in the same run.
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