DAB report

This report supplies monitored data on the various DAB caches.

Report output

The REPORT DAB statement is used to request the output of the DAB report.

Overflow screens may be requested for this report.
The monitored data output is sorted according to the sum of READ and WRITE.

 HOST0001 SM2 DAB                 CYCLE:   60 S                   <date>  <time>

 |       CACHE-ID             |  SIZE   |  READ  |RD HIT| WRITE  |WR HIT| OVER |
 |                            |         |  (1/S) | (%)  | (1/S)  | (%)  | (1/S)|
 +----------------------------+---------+--------+------+--------+------+------+
 | MMRD#SHVOL                 | 50.0 MB |   64.2 | 99.4 |    0.0 |  0.0 |  0.0 |
 | MMRD#2OSH                  |  150 MB |   30.8 |100.0 |    2.3 |  0.0 |  0.0 |
 | 2OSQ                       | 20.0 MB |    0.0 |  0.0 |    0.0 |  0.0 |  0.0 |
 | 1OSZ                       | 10.0 MB |    0.0 |  0.0 |    0.0 |  0.0 |  0.0 |
 | MMRD#SHPUB                 |  250 MB |    0.0 |  0.0 |    0.0 |  0.0 |  0.0 |
 | 1OSY                       | 10.0 MB |    0.0 |  0.0 |    0.0 |  0.0 |  0.0 |
 +----------------------------+---------+--------+------+--------+------+------+

Monitoring information

Each line of the report contains data on the different DAB caches created by the BS2000 system administrator using the /START-DAB-CACHING command.

The individual columns contain the following data:

CACHE-ID	Name of the DAB cache defined by the user in the CACHE-ID operand of the /START-DAB-CACHING command or assigned internally by DAB.
SIZE	Size of the DAB cache in KB, MB or GB.
READ (1/S)	Number of read operations per second  of all files served by the DAB cache.
RD HIT (%)	Percentage of read operations without disk access. SM2 compares the number of read operations for which disk access was not required (as the data to be read was already in the cache) with the total number of read operations  of all files served by the DAB cache.
WRITE (1/S)	Number of write operations per second   of all files served by the DAB cache.
WR HIT (%)	Percentage of write operations in which data was written to the cache in relation to the total number of write operations of all files served by the DAB cache.
OVER (1/S)	Number of failed attempts to use the DAB cache per second due to an overload.

While the SM2 DAB report contains the data of the last monitoring cycle, the BS2000 command SHOW-DAB-CACHING supplies the READ, WRITE and HIT values since the DAB cache was set up. The values of the DAB report and those of the SHOW-DAB-CACHING command cannot therefore be compared directly.