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Don Burleson Blog 







ORA-12014: Table Does Not Contain a Primary Key Constraint tips

Expert Oracle Database Tips by Donald BurlesonDecember 2, 2015

Question: I am creating a materialized view using the ROWID option and I get the ORA-12014 error:

ORA-12014: table 'MYTAB' does not contain a primary key constraint

Why should it if I try to create a MV with WITH ROWID refresh option and not WITH PRIMARY KEY one?

Answer:  The oerr utility notes this on the ORA-12014 error:

ORA-12014: table 'string' does not contain a primary key constraint  

Cause: The CREATE MATERIALIZED VIEW LOG command was issued with the WITH PRIMARY KEY option and the master table did not contain a primary key constraint or the constraint was disabled.  

Action: Reissue the command using only the WITH ROWID option, create a primary key constraint on the master table, or enable an existing primary key constraint.

You get the ORA-12014 error because Oracle cannot guarantee that a ROWID never changes.

ROWIDs may change when a table is reorganized or when row movement is enabled.

Also, without a primary key, you cannot do a materialized view fast refresh.  

Oracle must have a primary key defined because Oracle has no mechanism to update a materialized view replication when a ROWID changes.

See these best practices for defining a materialized view.

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