It is not created 1,000 times - it already exists. Using materialized views against remote tables is the simplest way to achieve replication of data between sites. If you create on and 1,000 people execute a query that uses it - the materialized view is used 1,000 times. DROP MATERIALIZED VIEW myschema.mvname; Materialized View Restrictions. Simply you can check if you have access to the dictionaries . Materialized Views; Therefore it is probably one of those types. It would be materialized 1,000 times in the above scenario. SELECT * FROM .@ Even Sylvain's question is very much applicable. The view which we use to make a replica of a target master from a single point in a time is known materialized view. 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. 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. Let’s take some examples of using EXISTS operator to see how it works.. Oracle EXISTS with SELECT statement example. 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. As we know why do we need materialized view in Oracle? Existing user tables and views can be listed by querying the data dictionary. Oracle Database - Enterprise Edition - Version 11.2.0.3 and later: ORA-23515: Materialized Views and/or Their Indices Exist in the Tablespace 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. 3) no, a materialized view EXISTS. To maintain the database consistency, we may need to refresh more than one Materialized View at a same time in a single transaction. The EXISTS operator returns true if the subquery returns any rows, otherwise, it returns false. ]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 … In addition, the EXISTS operator terminates the processing of the subquery once the subquery returns the first row.. Oracle EXISTS examples. Materialized Views in Oracle. See "Logging Columns in the Materialized View Log" for information. This can be achieved using a refresh group. 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 … redesign the system and eliminate those “tough” queries; cache the results of such queries; using materialized views. Lets first look at the OERR output. select object_name,object_type,owner from dba_objects where object_name='yourobject'; Or a very basic check with select . Another purpose of a group is the keep all the similar MViews together and keep the database simple and clean. If the materialized view contains a subquery, then each table referenced in the subquery should have a materialized view log. Otherwise, ... Also, check to see if your materialized view satisfies all of the following conditions. ORA-00942 on materialized view refresh. Special care on view log. Materialized views can also be used by Oracle Replication. 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