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Database Activity Detail for a VSAM Buffer Pool (IMS Systems) view (IDABVDTR)
The Database Activity Detail for a VSAM Buffer Pool (IMS Systems) view provides information about a selected VSAM buffer pool, including definitions, specifications, utilization, and database I/O activity.
The IDABVDTR view shows buffer pool activity levels, hit ratios, the average life of a block in a buffer pool, hiperspace space utilization, and I/O statistics. The I/O statistics are for the open databases using the specified buffer pool.
IDABVDTR identifies the databases that have had activity against the buffer pool and the relative I/O expense for database blocks being read, reread, or written.
You can use the IDABVDTR view to optimize a buffer pool definition by checking to see if a pool needs more buffers. The view shows the current relationships of databases to the buffer pool and their current performance, and you can use that information to decide which databases need to be assigned to a separate pool.
After you make buffer pool changes, you can use the TIME command to compare your results with the results from a prior time.
You can link to the IDABVDTR view from the following views:
- VSAM Pool ID field in the IDABVSMR view
- Pool ID field in the IDAPSUMR and IDAXSUMR views
IDABVDTR view
VSAM Pool ID............. XXXX IMS ID................. I12J
VSAM Pool Number......... 3 IMS Name............... I12J46CT
Pool Type................ DATA MVS Name............... SJSC
Buffer Fix Options....... BFR,BLK Data Sharing Group..... NONE
Buffer Size.............. 2048 Databases with I/O..... IVPDB***
Number Buffers........... 5 DD Names............... DFSIVD**
Number Hiperspace Buffers 0 VOLSERs................ BAB3**
Proclib Member........... DFSVSM1J
Proclib Section.......... N/A
BUFFER POOL STATISTICS... RELATED I/O STATISTICS.
Hit Ratio................ 66.667 Read I/O Rate......... 0.971
Average Time In Pool..... 5.15 Write I/O Rate......... 1.553
CI Search Rate........... 2.913 Sync Write Rate....... 0.971
Retrieve by Key Rate..... 0.777 Background Write Rate.. 0.583
Retrieve by RBA Rate..... 5.049 Buffer Steal Write Rate 0.000
LRECL Alter Rate......... 0.777
ESDS LRECL Insert Rate... 0.000
KSDS LRECL Insert Rate... 0.388
No hyperlinks are available on the view.
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