An updatable view lets you insert, update, and delete rows in the view and propagate the changes to the target master table.In order to be updatable, a view cannot contain any of the following constructs: SET or DISTINCT operators, an aggregate or analytic function, a GROUP BY, ORDER BY, CONNECT BY, or START WITH clause, a subquery (or collection expression) in a SELECT list or finally (with some exceptions) a JOIN .You start by setting these initialization parameters within Oracle to enable the mechanisms for Oracle materialized views and query rewrite, as shown here: Next, you must grant several system privileges to all users who will be using the Oracle materialized views.
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All operations performed on a view will affect data in the base table and so are subject to the integrity constraints and triggers of the base table.
A View can be used to simplify SQL statements for the user or to isolate an application from any future change to the base table definition.
We begin with a look at the initialization parameters and continue with details of the effective management and use of Oracle materialized views.
In order to use Oracle materialized views, the Oracle DBA must set special initialization parameters and grant special authority to the users of Oracle materialized views.
CREATE MATERIALIZED VIEW emp_mv REFRESH FORCE ON DEMAND ON PREBUILT TABLE AS SELECT * FROM [email protected]; Since a complete refresh involves truncating the materialized view segment and re-populating it using the related query, it can be quite time consuming and involve a considerable amount of network traffic when performed against a remote table.