Upgrade of APEX 4.1 Fails With "ORA-00001: unique constraint (APEX_040200.WWV_FLOW_MESSAGES_IDX1) violated"

(Doc ID 1961235.1)

Last updated on OCTOBER 27, 2016

Applies to:

Oracle Application Express (formerly HTML DB) - Version and later
Information in this document applies to any platform.


An Application Express (APEX) 4.1.1 instance is being upgraded to 4.2.6 which fails. Checking the install log files, the following error can be seen.

  ...Language Maps for Application 8950
  ...text messages
  ......Message administration
  ERROR at line 1:
  ORA-00001: unique constraint (APEX_040200.WWV_FLOW_MESSAGES_IDX1) violated
  ORA-06512: at "APEX_040200.WWV_FLOW_API", line 11928



 Upgrade Application Express (APEX) 4.1.1 instance to 4.2.6.


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