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AQ/PLSQL Notifications Do Not Maintain FIFO or Priority Ordering (Doc ID 225810.1)

Last updated on SEPTEMBER 02, 2020

Applies to:

Oracle Database - Enterprise Edition - Version 9.2.0.8 to 11.2.0.3 [Release 9.2 to 11.2]
Oracle Database - Enterprise Edition - Version 12.1.0.2 to 12.1.0.2 [Release 12.1]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Information in this document applies to any platform.
Information in this document applies to any platform.


Purpose

To discuss the unpublished bug 1567187 PL/SQL Notification cannot be serialized and a workaround to it.

Scope

This article is intended for anyone interested in maintaining first-in first-out (FIFO) or priority ordering of callbacks when using AQ PL/SQL notifications.

Details

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In this Document
Purpose
Scope
Details
 Serialization of AQ PL/SQL Notifications
 Notification example demonstrating that Priority ordering is not maintained using a standard callback procedure
 Notification example demonstrating that Priority ordering is maintained using a modified callback procedure
References

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