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ORA-26688 Missing Key in LCR

Oracle Tips by Burleson 

Oracle Streams
Chapter 7 -
Monitoring and Troubleshooting Oracle Streams

ORA-26688 Missing Key in LCR

The oerr utility lists for the ORA-26888 error:

Cause: Metadata mismatch, or not enough information in the user generated LCR.

Action: Alter the database object, or provide all defined keys in the LCR.


  • The object for which an LCR is applying a change does not exist in the destination database. In this case, it is necessary to ensure that the object exists. Make sure that the correct character case is used in rule conditions, Apply handlers, and rule-based transformations.

  • Supplemental logging is not specified for columns that require supplemental logging at the source database. In this case, LCRs from the source database may not contain values for key columns.

  • There may be problem with the primary key in the destination table. If no primary key exists for the table or if the target table has a different primary key than the source table, substitute key columns can be specified using the set_key_columns procedure in the dbms_apply_adm package.

The above text is an excerpt from:

Oracle Streams
High Speed Replication and Data Sharing

ISBN 0-9745993-5-2

by Madhu Tumma

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