Creates a materialized view (also called a snapshot), which is the result of a query run against one or more tables or views. It would be materialized 1,000 times in the above scenario. You may had to add WITH SEQUENCE to your log creation to cope with certain use as stated in Oracle documentation : Specify SEQUENCE to indicate that a sequence value providing additional ordering information should be recorded in the materialized view … In addition, the EXISTS operator terminates the processing of the subquery once the subquery returns the first row.. Oracle EXISTS examples. 3) no, a materialized view EXISTS. Let’s take some examples of using EXISTS operator to see how it works.. Oracle EXISTS with SELECT statement example. ORA-00942 on materialized view refresh. See "Logging Columns in the Materialized View Log" for information. If the materialized view contains a subquery, then each table referenced in the subquery should have a materialized view log. SELECT * FROM .@ Even Sylvain's question is very much applicable. Using materialized views against remote tables is the simplest way to achieve replication of data between sites. A materialized view, or snapshot as they were previously known, is a table segment whose contents are periodically refreshed based on a query, either against a local or remote table. A WITH subquery would be materialized for EACH QUERY execution. The view which we use to make a replica of a target master from a single point in a time is known materialized view. As we know why do we need materialized view in Oracle? Cause: The Oracle table or Oracle view entered does not exist, a synonym that is not allowed here was used, or a view was referenced where a table is required. Another purpose of a group is the keep all the similar MViews together and keep the database simple and clean. ]materialized_view_name [Physical_Attributes_Clause] [STORAGE Storage_Clause] [REFRESH [FAST | COMPLETE | FORCE] [START WITH date] [NEXTREF date]Changes the storage or automatic refresh characteristics of a materialized view … Certain privileges may be … If a user-defined materialized view already exists, then use the ON PREBUILT TABLE clause in the CREATE MATERIALIZED VIEW statement. To maintain the database consistency, we may need to refresh more than one Materialized View at a same time in a single transaction. Existing user tables and views can be listed by querying the data dictionary. ORA-00942 is one of the many errors which Oracle developer ,Oracle DBA often gets.. If you create on and 1,000 people execute a query that uses it - the materialized view is used 1,000 times. Check if the materialized view log exists for all tables that are involved in a fast refresh materialized view. Materialized Views in Oracle. First, let's use the oerr command to see details on the ORA-00942 error: ORA-00942 table or view does not exist Cause: The table or view entered does not exist, a synonym that is not allowed here was used, or a view was referenced where a table is required. Special care on view log. Lets first look at the OERR output. It is not created 1,000 times - it already exists. Materialized views can also be used by Oracle Replication. redesign the system and eliminate those “tough” queries; cache the results of such queries; using materialized views. If you can select from it then it rules out the first five leaving it to be either a table, view, private synonym or materialized view. This can be achieved using a refresh group. 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