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Status Delivered
Workspace Db2
Created by Guest
Created on Jun 19, 2018

Make logprimary and logfilsiz online configurable

If workload increases on system, it might be necessary to adjust (typically increase) the available active log space. System downtime is not acceptable in our days. It is sufficient if the log files get resized before re-use and the amount of log files adjust on next log file reclaim. Nevertheless the available disk space should be checked when the config change request gets performed.
  • Guest
    May 5, 2020

    Hi Michael,
    good that we have increased the upper limit to 4096 now. this should help!

    But, I still see a need, for this.. specially for LOGFILSZ.

    Most of dbs out there are deployed using standard values.. New APP, new DB, nobody know what will be the transaction volume.. You need to tune that , later..
    So, just allowing us to increase LOGSECOND to a big value (more than 255 now) , helps, but its not enough to fully and best tune them...
    Keeping logfile sizes smaller can bring issues, like too much archive logs being generated, etc.. so increasing the logfile size is needed..

    Or vice-versa..
    shared db hosting several different applications, but few of them changed or has been decommissioned, and the workload has decreased.. no need to keep huge, big transaction logs anymore.. so a need to reduce the logfilesize is again required..

  • Admin
    Michael Roecken
    May 5, 2020

    Although we have not made LOGPRIAMRY nor LOGFILSIZ online configurable in 11.5.0.0 we have increased LOGPRIMARY and LOGSECOND to 4096 each. So a dynamic LOGSECOND update can be done to address this immediate concern.

    Also, a tech preview in 11.5.0.0 and pending support coming soon, Advanced Log Space Management (https://www.ibm.com/support/pages/db2-version-115-advanced-log-space-management-tech-preview) will address transaction log full problems for OLTP type workloads.

    We would like customers to try these two new features and then provide feedback if there is still a need for both LOGPRIMARY and LOGFILSIZ to become online configurable.