Updating views in oracle

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.

The rules for updating user-defined inline functions are the same as they are for views.The following code creates a refresh group defined to refresh every minute and assigns a materialized view to it.Materialized views can be used to improve the performance of a variety of queries, including those performing aggregations and transformations of the data.The example code in this article assumes DB1 is the master instance and DB2 is the materialized view site.-- Normal CREATE MATERIALIZED VIEW view-name BUILD [IMMEDIATE | DEFERRED] REFRESH [FAST | COMPLETE | FORCE ] ON [COMMIT | DEMAND ] [[ENABLE | DISABLE] QUERY REWRITE] AS SELECT ...; -- Pre-Built CREATE MATERIALIZED VIEW view-name ON PREBUILT TABLE REFRESH [FAST | COMPLETE | FORCE ] ON [COMMIT | DEMAND ] [[ENABLE | DISABLE] QUERY REWRITE] AS SELECT ...; clause tells the database to use an existing table segment, which must have the same name as the materialized view and support the same column structure as the query.

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