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Database Activity Detail for an OSAM Buffer Pool (IMS Systems) view (IDABODTR)
The Database Activity Detail for an OSAM Buffer Pool (IMS Systems) view (IDABODTR) provides information about a selected OSAM buffer pool, including definitions, specifications, utilization, and database I/O activity.
The IDABODTR view shows buffer pool activity levels, hit ratios, the average life of a block in a buffer pool, OSAM cache utilization, sequential buffering utilization, and I/O statistics. The I/O statistics are for the open databases that are using the specified buffer pool.
IDABODTR 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 IDABODTR 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 hyperlink to the IDABODTR view from the OSAM Pool ID field in the IDABOSMR view and from the Pool ID field in the IDAPSUMR and IDAXSUMR views.
IDABODTR view
OSAM Pool ID............ OSM2 IMS ID................. I12J
Buffer Fix Options...... BFR,BLK IMS Name............... I12J46CT
Buffer Size............. 2048 MVS Name............... SJSC
Number Buffers.......... 5 Data Sharing Group..... NONE
Proclib Member.......... DFSVSM1J Databases with I/O..... IVPDB1
Proclib Section......... N/A DD Names............... DFSIVD1
VOLSERs................ BAB301
BUFFER POOL STATISTICS.. RELATED I/O STATISTICS.
Hit Ratio............... 57.143 Read I/O Rate.......... 1.523
Average Time In Pool.... 3.283 Write I/O Rate......... 0.338
Block Search Rate....... 3.553 Sync Write Rate........ 0.338
Wait for IDENT Rate... 0.000 Buffer Steal Write Rate 0.000
Wait for Read Rate.... 0.000 Purge Write Rate....... 1.015
Wait for Write Rate... 0.000 SB Async Seq Read Rate. 0.000
Block Create Rate....... 0.000 SB Sync Seq Read Rate.. 0.000
Buffer Search Rate...... 3.215
Buffer Alter Rate....... 1.015
Purge Call Rate......... 0.338
No hyperlinks are available on the view.
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