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Don Burleson Blog 







ORA-12058: materialized view cannot use prebuilt table tips

Expert Oracle Database Tips by Donald BurlesonAugust 18, 2015

Question: I am creating a materialized view and I get this error:

ORA-12058: materialized view cannot use prebuilt table

If I remove "with rowid", I get error that cannot create because no primary key on source table.  My options appear to be

(1) do not use prebuilt table (in which case we'd lose additional data) or

(2) add a primary key on the master table

What's the best option to avoid the ORA-12058 error?

Answer:  As you see, it's not possible to create materialized view ON PREBUILT TABLE with the ROWID syntax, and you must use a primary key if you want to use the ON PREBUILT TABLE option. However, there are some tricks for making an existing table into a materialized view.

If you already have a unique index on the key column for the table, you can always drop the index and re-add it as a primary key constraint.  This rebuilds the unique index.

The ON PREBUILT TABLE option is used when you have pre-created the table.  This is often accomplished using CTAS syntax, and the goal is to keep the table synchronized by changing it from a table to a materialized view.  

In many cases, it's easier to drop the table and let Oracle recreate it.  The Oracle documentation (also see MOSC note 254593.1) says that your choices are either BUILD IMMEDIATE or BUILD DEFERRED . . . .

ORA-12058: materialized view cannot use prebuilt table

Cause: An attempt was made to use the prebuilt tables.

Action: Reissue the SQL command using BUILD IMMEDIATE or BUILD DEFERRED.


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