Expert Advice

NAS_AA_IMS_AppQPctFull_Warn  
Situation Description
Suggested Actions
Situation Description

This situation is triggered when the apply queue percent full as determined by the IMS apply server has reached a warning level. The apply queue percent full is the percentage of the target (apply) cache in use (queue depth), computed as (Current Cache Size/Maximum Cache Size)*100 and rounded down to the nearest whole integer.

The Apply Queue Percent Full attribute is displayed in the IMS Apply Server Details table view and the Apply Queue Percent Full circular gauge view of the IMS Replication Details workspace.

 

Suggested Actions

The apply queue percent full may be higher than expected due to the following conditions:

  • Replication is restarted and there is a large amount of pending source updates to be processed. The apply queue percent full should return to a normal level when the backlog is processed.
  • The occurrence of a large high volume batch (BMP or Batch DL/I) window or a peak update period. The apply queue percent full should return to a normal level when the number of source updates to be processed has dropped and the servers have a chance to catch up.
  • The apply cache is too small.

Possible user actions are:

  • Set the apply cache to 2G (the current max) and restart replication.
  • If the cache was already at 2G, you may need to restart replication several times until the volume reduces as the apply server will do a controlled stop of replication when the apply cache limit is reached.
  • If the subscription allows, consider increasing the apply PSB number for the subscription to increase parallelism. This may require IMS pool space and DFSPZPxx member changes. Replication must be stopped to make this change. If the subscription doesn't qualify for parallel apply, consider creating 2 subscriptions, one with DBDs that qualify for parallel apply and another with the DBDs that do not qualify for parallel apply.

 

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