Expert Advice

NAS_AA_IMS_CapQPctFull_Warn  
Situation Description
Suggested Actions
Situation Description

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

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

 

Suggested Actions

The capture 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 capture 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 capture 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 capture cache is too small.

Possible user actions are:

  • Set the capture cache to 2G (the current max) and restart replication.
  • If the cache was already at 2G, you can let replication run, or 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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