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Status Future consideration
Workspace Informix
Components Informix Server
Created by Guest
Created on Feb 25, 2022

Allow Bufferpool Min_lru_dirty and Max_lru_dirty Threshold values to be altered dynamically

onparams -b can be used to add a new bufferpool and AUTO_LRU_TUNING are available on informix server but first only adds a bufferpool of a new page size and the latter only kicks in if some foreground writes occur on a server which ideally is never.

Sometimes depending on workload the min and max thresholds need to be altered or they no longer suit and need to be refined. This occasionally takes a number of attempts to tune correctly. After setting them you also need to wait until a reasonable workload is going through server so bufferpool is caching as expected and only then will you know if values are suitable. On a high throughput system its not practical to take continual outages to fine tune these.

If auto_tune can change number of lrus, min and max dynamically then it should be technically possible to alter onparams -b for added functionality to tune the values for a specific bufferpool page size. Using it for just adding a new bufferpool size is of minimal benefit.

Needed By Quarter
  • Guest
    Mar 7, 2022

    On the other hand, I would complicate matters by having a different parameter, say:

    AUTOTUNELRU 1/0 # To enable or disable auto LRU tuning

    and having yet another onmode option to dynamically enable/disable it at the discretion of the DBA.

  • Guest
    Mar 7, 2022

    I'm actually surprised this has not been a feature for years; I thought we had this in IDS 11 already, or earlier.