A method for maintaining high availability for an on-line database which includes: creating a first user account having a plurality of first tables and first schema objects; creating a second user account having a plurality of second tables and second schema objects; creating a third user account having a first set of synonyms for the first tables and first schema objects; creating a fourth user account having a second set of synonyms for the second tables; accessing the first user account using the first set of synonyms; modifying data using the second set of synonyms into the second user account to provide a plurality of revised second tables and revised second schema objects; dropping the first set of synonyms; creating a third set of synonyms in the third user account for the plurality of revised second tables and revised second schema objects; and accessing the second user account using the third set of synonyms.

 
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