In order to evaluate catalog I/O activity, use the MODIFY CATALOG,REPORT,CATSTATS command. You can use the command to evaluate the activity and settings for a specified catalog, or for all catalogs that are currently open and active. The numbers shown in this report are in decimal. If a 'K' appears after the number, it means that the number has been divided by 1024. Following is an example of the output for a Catalog I/O Statistics report:

IEC359I CATALOG I/O STATS REPORT
*CAS****************************************************************
*     ADDS  UPDATES     GETS   GETUPD  DELETES  BUFNI  BUFND STRNO *
*                                                                  *
* SYS1.PROD.UCAT1                                                  *
*     356      321    1,472      947        5       4      4     2 *
* SYS1.MVSRES.MASTCAT                                              *
*      36       33    2,394       10        0       4      4     2 *
*CAS****************************************************************

The cumulative statistics reported here (Adds, Updates, Gets, Getupd, and Deletes) are from the time the catalog was opened following IPL, or following the issuance of MODIFY CATALOG,RESET command. The following describes the columns for this report:

ADDS

The number of catalog entries added to this catalog over the reported interval.

UPDATES

The number of catalog entries modified in this catalog over the reported interval.

GETS

The number of catalog entries read from this catalog over the reported interval.

GETUPD

The number of catalog entries gotten for update from this catalog over the reported interval.

DELETES

The number of catalog entries deleted from this catalog over the reported interval.

BUFNI

The number of I/O buffers VSAM uses for transmitting catalog index entries for this catalog.

BUFND

The number of I/O buffers VSAM uses for transmitting catalog entries for this catalog.

STRNO

The number of concurrent catalog positioning requests that VSAM should manage for accessing the catalog.

If you are interested in more detailed information for a particular catalog or set of catalogs, you can utilize the MODIFY CATALOG,REPORT,CATSTATX(catname) or MODIFY CATALOG,REPORT,CATSTATX(catprefix*) command. Following is an example of the output for extended catalog statistics:

IEC359I EXTENDED CATALOG STATS
*CAS************************************************************
* CATALOG NAME     = SYS1.UCAT.TEST                            *
* INSERTS (ADDS)   = 12,486                                    *
* UPDATES          = 3,758                                     *
* RETRIEVES        = 21,816                                    *
* RETRIEVES FOR UP = 9,760                                     *
* ERASES (DELETES) = 3,456                                     *
* CA-RECLAIMS      = 16                                        *
* CA-REUSES        = 4                                         *
* BUFNI SETTING    = 4                                         *
* BUFND SETTING    = 4                                         *
* STRNO SETTING    = 2                                         *
* AVG ELAPSED TIME =  32.359 MSEC                              *
* AVG CPU TIME     = 462.718 USEC                              *
*CAS************************************************************

In addition to the items found in the CATSTATS format of the report, two additional fields appear:

CA-RECLAIMS

The number of CA reclaims performed by VSAM on this catalog over the reported interval. Note that for RLS Catalogs this information will show up as N/A as the values are not currently available.

CA-REUSES

The number of CA reuses performed by VSAM on this catalog over the reported interval. Note that for RLS Catalogs this information will show up as N/A as the values are not currently available.

AVG ELAPSED TIME

The average elapsed time for all requests to this catalog over the reported interval.

AVG CPU TIME

The average cpu time for all requests to this catalog over the reported interval.