HD50884: CAA EHI: VERY BAD PERFORMANCE OF API LISTLINKEDPROTECTIONS

APAR status

• Closed as Permanent restriction.

Error description

• CAA EHI: ListLinkedProtections
  .
  The time needed to retreive the protection linked to
  a Bundle Segment is too long.
  Since a main harness may have some hundreds of
  Protections,
  a program that reads Protection information will
  run several
  minutes just to retrieve the information.
  .
  

Local fix

Problem summary

• CAA EHI: Very bad performance of API ListLinkedProtections
  CAA EHI: ListLinkedProtections
  .
  The time needed to retreive the protection linked to
  a Bundle Segment is too long.
  Since a main harness may have some hundreds of
  Protections,
  a program that reads Protection information will
  run several
  minutes just to retrieve the information.
  .
  

Problem conclusion

• Incident Diagnosis :
  .
  Bad performance when using
  CATIEhiBundleSegment::ListLinkedProtections
  .
  .
  Restriction Explanation :
  .
  The internal link between protection and Bundle
  segment is in the direction Protection -> Bundle
  segment. So this means that implementation is
  scanning from all Protections in session the bundle
  segment. This means that each call cost a call to
  CATIEhiProtection::ListBundleSegments for all
  pretection in session.
  - We have no inverse link persistant for efficiency
  of the data model (no duplication of data)
  - We don't maintain inverse list table in session as
  the CPU cost to update this table after any
  modification will be more important in fine than the
  CPU cost to using the API as is.
  .
  .
  By-Pass :
  .
  If the prurpose is to call one shot this API: no by
  pass
  If the purpose is in a single transaction (can be
  interactive command or process) query a lot of
  time the protection from bundle segment, and if
  during this transaction no modification is done to
  Bundle or Protection, we recommend to use the
  CATIEhiProtection::ListBundleSegments API for all
  protection i session to generate a table to retreive
  then this inverse link.
  .
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

Fix information

Applicable component levels