DBMS_METADATA_DIFF.COMPARE_ALTER_XML DOES NOT CAPTURE CHAR/BYTE CHANGE
Last updated on APRIL 22, 2018
Applies to:
Oracle Database - Enterprise Edition - Version 11.2.0.4 to 12.2.0.1 [Release 11.2 to 12.2]Information in this document applies to any platform.
Symptoms
When using DBMS_METADATA_DIFF.COMPARE_ALERT_XML, an alter table command to change just the length semantics from BYTE to CHAR or CHAR to BYTE is not captured, however DBMS_METADATA sees the change.
If we also change the length of the column, the change can be captured by DBMS_METADATA_DIFF.COMPARE_ALERT_XML.
The package should pick up the change as it alters the default of the character storage. If a table column's char semantics has been modified from BYTE to CHAR and DBMS_METADATA_DIFF.COMPARE_ALERT_XML() does not report this difference.
Cause
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