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11.2 Client Unable To Receive Notifications From 11.2 Database (Doc ID 1310859.1)

Last updated on FEBRUARY 01, 2022

Applies to:

Oracle Data Provider for .NET - Version and later
Oracle Database - Enterprise Edition - Version and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Information in this document applies to any platform.


Some versions of 11.2 client software is unable to receive change notifications / OCI Callbacks or AQ notifications against some versions of 11.2 database.

Typically no errors result, and the observed behavior is that the notification simply does not occur.

A row will be observed in DBA_CHANGE_NOTIFICATION_REGS, but then be removed, without notification occurring at the client.

Note that the behavior of this problem is consistent, and no notifications at all will be received. This bug does not apply for intermittent behaviors.

In the case of client pointing to database, the following error may occur:

     kpcerecv: incorrect iovec count=6210
     kpcest_err_handler: Max errors exceeded..Closing connection




Behavior may be noticed as a result of upgrading either client or database software to the affected versions, or after applying a CPU that contains the fix for unpublished Bug 10065474 .


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