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Database I/O Activity for VSAM Buffer Pools (IMS Systems) view (IDABVSMR)
The Database I/O Activity for VSAM Buffer Pools (IMS Systems) view (IDABVSMR) provides database I/O activity information for VSAM databases summarized at the buffer pool level.
You can use the IDABVSMR view to analyze I/O information related to buffer pools and to recognize and solve N-way data sharing problems resulting from badly organized databases, I/O contention, buffer pool sizes and assignments, or buffer cross-invalidation.
IDABVSMR shows I/O totals, rates, and average times for all open VSAM databases.
You can link to the IDABVSMR view from the following views:
- VSAM Buffer Pools option in the IMS Fast Menu (EZIFASTR) and the DBCTL DBA Easy Menu (EZIDBA)
- VSAM Wrst Hit and Buf Steal fields in the IMS Dashboard view (IMSDASSR)
- VSAM Bufr Pool Hit Ratio field in the IDASDTLR view
- Worst VSAM Pool Hit Ratio field in the IDAGDTLR view
- VSAMPool HitRatio field in the IDAGSUMR and IDASSUMR views
- IDABVSMR field in the IDABVSTR view
IDABVSMR view
Command: UPD (Create/Modify buffer pools) IMSCMDS (Issue IMS Commands)
Linecmd: U (Modify a selected subpool) IDABVSTR (VSAM String Metrics)
C VSAM Pool Bufr Num Srch Hit Hprsp HprHit AVGTime DB's Read Write
- Pool ID Type Size Bufr Rate Ratio Bufr Ratio InPool with I/O Rate Rate
XXXX DATA 2048 5 1.10 66.7 0 0.00 13.60 IVPDB1I 0.4 0.37
XXXX DATA 512 5 0.00 0.0 0 0.00 ? 0.0 0.00
XXXX DATA 1024 5 0.00 0.0 0 0.00 ? 0.0 0.00
XXXX DATA 4096 5 1.10 100.0 5 0.00 ? 0.0 0.00
XXXX DATA 8192 5 0.00 0.0 5 0.00 ? 0.0 0.00
The following hyperlinks are available on the view:
Link from | To access |
|---|---|
VSAM Pool ID | Database Activity Detail for a VSAM Buffer Pool (IMS Systems) view (IDABVDTR), where you can see a detailed view of the same buffer pool |
DB’s with I/O | Database I/O Activity for Databases/Volumes (IMS Systems) view (IDAXSUMR), where you can see the statistics broken down by database volume and VSAM component and where you can see more specifically where the I/O is occurring within a specific volume or VSAM component |
IDABVSTR | VSAM Strings Metrics real time view (IDABVSTR) |