IT05738: PERFORMANCE ISSUE WHEN ACCESSING A SHARED MAILBOX WITH LARGE NUMBER OF LINKED USERS.

APAR status

• Closed as program error.

Error description

• When accessing a shared mailbox with a large number of links,
  performance gets worse as the number of links increases.
  

Local fix

Problem summary

• Platforms Affected:
  All
  
  Users Affected:
  All
  
  Problem Description:
  Observed large number of permission style queries to the
  database when a mailbox user performs operations on a mailbox
  directory which is linked to a shared mailbox.
  Found application was unnecessarily performing permission checks
  on all users with access to the shared mailbox.
  Problem appears when number of users sharing a mailbox nears or
  exceeds User/Rights cache size.
  

Problem conclusion

• Resolution Summary:
  Modify mailbox access logic to perform permission check only on
  user performing operation.
  
  Delivered In:
  5020500_3
  

Temporary fix

• Increase UserRights cache size.
  

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

• Fixed component name

  STR B2B INTEGRA

• Fixed component ID

  5725D0600

Applicable component levels

• R525 PSY

     UP