IMAP THREAD REFERENCE and SORT Performance Degradation

(Doc ID 1405263.1)

Last updated on NOVEMBER 15, 2017

Applies to:

Oracle Communications Messaging Server - Version: 7.0-4 and later   [Release: 7u1 and later ]
Information in this document applies to any platform.
Affects IMAP email clients that utilize the REFERENCES" algorithm when using the IMAP THREAD extension.


IMAP searches that utilize the IMAP thread extension with the REFERENCES algorithm can experience a performance degradation with mailboxes that contain 6000 or more messages.

An example of the scale:

No. of emailsThreading Time Taken
22503.75 sec
45003.75 sec
670015 sec
900020 sec
1400026 sec
1800030 sec


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