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Unexpetected Rows In The Change Table When Source Table Contains a BLOB Column (Doc ID 1394682.1)

Last updated on JANUARY 21, 2020

Applies to:

Oracle Database - Enterprise Edition - Version 10.1.0.2 to 10.2.0.5 [Release 10.1 to 10.2]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.

Symptoms

When inserting a new row in the source table containing a BLOB column tracked by Asynchronous CDC,  you would find one or two more extra rows inserted in the change table than  expected.

Expected row would be the one with  "I" in OPERATION$ column in the change table, but extra rows would have a value "UO" or "UN", indicating an update operation.

The BLOB column may not be a part of the change table definition,at all.

Cause

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In this Document
Symptoms
Cause
Solution

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