The view name must be distinct from the name of any other view… Share. But I want to add more columns to it. But I want to add more columns to it. Improve this question. No, you cannot alter the query of a materialized view without dropping it. A materialized view may be schema-qualified; if you specify a schema name when invoking the CREATE MATERIALIZED VIEW command, the view will be created in the specified schema. A materialized view can query tables, views, and other materialized views. I saw that it is not possible to execute CREATE OR REPLACE to the materialized view so how can I do that ? The CREATE MATERIALIZED VIEW syntax does not support that feature. Create Logical View CREATE OR REPLACE VIEW .XXXXX_CREATE_CUSTOMER_MV# AS ; Upgrade Logical View to Materialized View exec ad_zd_mview. Tutorial How to Create Materialized Views: Databases for Developers: Performance #6; Description An introduction to materialized views. Follow asked Jun 23 '15 at 15:41. A materialized view, or snapshot as they were previously known, is a table … They are local copies of data located remotely, or are used to create summary tables based on aggregations of a table's data. When you create a Materialized view, Oracle Database creates one internal table and at least one index, and may create one view, all in the schema of the materialized views. And all I get is an error: ORA-01658: unable to create INITIAL extent for segment in tablespace MySmallTS. They are local copies of data located remotely, or are used to create summary tables based on aggregations of a table's data. which also means that you'd actually use the view in selects, not the materialized view; materialized view refresh would work as usual; For example: oracle materialized-views. CREATE [OR REPLACE] VIEW viewname AS SELECT select_query; This is specifically for Oracle SQL but it should be similar for all other databases. Thanks! A materialized view in Oracle is a database object that contains the results of a query. There are two steps to create Materialized Views in 12.2. create a materialized view, with all the rowids; create a view on a top on that materialized view which shows only columns you want that way, you'd "hide" everything you don't need (rowids, right?) Because when you use the DROP VIEW and CREATE VIEW to change the view’s definition, Oracle removes the view privileges, which may not be what you want. A materialized view in Oracle is a database object that contains the results of a query. Complete this tutorial to learn how to create materialized views, keep them up-to-date, and enable existing queries to use them. These can make queries aggregating millions or billions of rows down to a handful lightning quick. Materialized views are useful in Data-warehousing concepts. CREATE MATERIALIZED VIEW MV_Test NOLOGGING CACHE BUILD IMMEDIATE REFRESH FAST ON COMMIT AS SELECT V.*, P.*, V.ROWID as V_ROWID, P.ROWID as P_ROWID FROM TPM_PROJECTVERSION V, TPM_PROJECT P WHERE P.PROJECTID = V.PROJECTID Another key aspect to note is that your materialized view logs must be created as with rowid.

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