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Status Not under consideration
Workspace Db2 for z/OS
Created by Guest
Created on Jul 16, 2025

RELATED IDEAS

DISPLAY BUFFERPOOL issues a message, TOTAL SYNC I/O DELAY FOR BP?? = ?????????? MILLISECONDS.

We are currently are running a bufferpool simulation in production.
When I issue the command:

-DISPLAY BUFFERPOOL(BP40) DETAIL(INTERVAL)

The following message is issued:

DSNB432I -DPP2 SIMULATED BUFFER POOL ACTIVITY -
AVOIDABLE READ PAGE MISSES -
SYNC FROM DASD (R) = 160491154
SYNC FROM DASD (S) = 186780
ASYNC FROM DASD = 8914514
SYNC FROM GBP (R) = 807045
SYNC FROM GBP (S) = 732
ASYNC FROM GBP = 16077
PAGES MOVED INTO SIMULATED BUFFER POOL = 1311326000
TOTAL AVOIDABLE SYNC I/O DELAY = 21961032 MILLISECONDS

Please can the following information be made available in a DISPLAY BUFFERPOOL command for an actual/active/real bufferpool please?

TOTAL SYNC I/O DELAY FOR BP?? = ?????????? MILLISECONDS

This would reduce the time spent determining the actual impact of an increase in bufferpool size and simplify bufferpool monitoring? 

IBM provide this information for a simulated bufferpool:

TOTAL AVOIDABLE SYNC I/O DELAY = 21961032 MILLISECOND

Why not provide the same information for a actual/active/real bufferpool please? This would allow me to quickly determine the following:

1. How accurate the simulated bufferpool data actually was/is.

2. How many milliseconds were actually saved by an increase in bufferpool size.

3. Does the bufferpool require an increase in size due to more time being spent in sync I/O delays? 

This information would simplify bufferpool monitoring.

We currently do add up the information from the DB2 SMF dataset statistics (average sync I/O delay * number of sync I/Os) on a daily basis and store this information in a performance database; however, this is a time consuming process. The information is extremely useful. Please make this information available via a DISPLAY BUFFERPOOL command (as you currently do for simulated bufferpools).

Thank you.

Neil Dyer

Needed By Yesterday (Let's go already!)
  • Admin
    SOO KIM
    Oct 8, 2025

    Dear Neil,

    Thank you for submitting this Db2 for z/OS enhancement request. We have reviewed this request and believe it is a good candidate for the Db2 for z/OS product. However, it does not align within functionality prioritized for delivery within the next 12 months.

    For the real buffer pool, currently the total synchronous read I/O time is accumulated per dataset, which is then used to output the average synchronous read I/O time for the dataset. We understand that having the synchronous read I/O time accumulated for the buffer pool in the Db2 code would be beneficial, especially considering the large number of datasets that can use a buffer pool.

    Even though we are putting it "under not consideration" for now, we do plan to revisit this idea when we re-prioritize our development roadmap.

    We appreciate your input to the Db2 for z/OS development team. We hope that you will continue to submit enhancement suggestions for improvements as customer feedback is a key component to shaping the future direction of Db2 for z/OS.

    Sincerely,

    Db2 for z/OS Team

    Reply

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