Database schema customizations

When customizing the database schema, you should only perform the following actions:

  • Create a new object.

  • Add a new column to a built-in table.

Do not perform the following actioons to customize the database schema:

  • Drop a built-in object.

  • Rename a built-in object.

  • Drop a column from a built-in table.

  • Rename a column in a built-in table.

  • Replace a built-in view, procedure, package, or trigger.

Built-in objects include tables, views, procedures, packages, indexes, triggers, and sequences.