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