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. Another purpose of a group is the keep all the similar MViews together and keep the database simple and clean. Existing user tables and views can be listed by querying the data dictionary. Materialized Views in Oracle. If the materialized view contains a subquery, then each table referenced in the subquery should have a materialized view log. 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. Creates a materialized view (also called a snapshot), which is the result of a query run against one or more tables or views. redesign the system and eliminate those “tough” queries; cache the results of such queries; using materialized views. ORA-00942 is one of the many errors which Oracle developer ,Oracle DBA often gets.. Materialized Views; Therefore it is probably one of those types. 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 … ORA-00942 on materialized view refresh. Materialized views can also be used by Oracle Replication. ALTER MATERIALIZED VIEW [schema. select object_name,object_type,owner from dba_objects where object_name='yourobject'; Or a very basic check with select . Simply you can check if you have access to the dictionaries . This can be achieved using a refresh group. Using materialized views against remote tables is the simplest way to achieve replication of data between sites. Materialized View Restrictions. It would be materialized 1,000 times in the above scenario. 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. Otherwise, ... Also, check to see if your materialized view satisfies all of the following conditions. In addition, the EXISTS operator terminates the processing of the subquery once the subquery returns the first row.. Oracle EXISTS examples. If a user-defined materialized view already exists, then use the ON PREBUILT TABLE clause in the CREATE MATERIALIZED VIEW statement. As we know why do we need materialized view in Oracle? SELECT * FROM .@ Even Sylvain's question is very much applicable. ]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 … 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 view which we use to make a replica of a target master from a single point in a time is known materialized view. A WITH subquery would be materialized for EACH QUERY execution. Special care on view log. Oracle Database - Enterprise Edition - Version 11.2.0.3 and later: ORA-23515: Materialized Views and/or Their Indices Exist in the Tablespace Check if the materialized view log exists for all tables that are involved in a fast refresh materialized view. Lets first look at the OERR output. 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; It is not created 1,000 times - it already exists. See "Logging Columns in the Materialized View Log" for information. Let’s take some examples of using EXISTS operator to see how it works.. Oracle EXISTS with SELECT statement example. The EXISTS operator returns true if the subquery returns any rows, otherwise, it returns false. 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. Certain privileges may be … Otherwise, it returns false first row.. Oracle EXISTS with select view is used 1,000 times - already! Why do we need materialized view already EXISTS, then use the PREBUILT! Database simple and clean CREATE ON and 1,000 people execute a query that uses it - the materialized view.. 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