Oracle Database Error Code ORA-12000 Description :
a materialized view log already exists on table 'string'
Error Cause:
An attempt was made to create a materialized view log on a table that already has a materialized view log. Each master table can have only one materialized view log.
How to Solve :
All materialized views on a table can use the same materialized view log for that table. To make changes to the existing log, use the ALTER MATERIALIZED VIEW LOG command or drop the materialized view log and create it again.
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