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Where are Oracle materialized views stored?

Where are Oracle materialized views stored?

A materialized view log is located in the master database in the same schema as the master table. A master table can have only one materialized view log defined on it. Oracle Database can use this materialized view log to perform fast refreshes for all fast-refreshable materialized views based on the master table.

How do I check if a materialized view exists?

  1. To actually check that materialized view exists use select count(*) instead of simple select * . In case of 1 – it exists, 0 – you get the idea.. – chill appreciator.
  2. @standalone – not exactly. There may be more than one view with the same name, so rather select count (*) > 0 (returns Boolean). – klin.

How do you get DDL of a materialized view in Oracle?

“how to get ddl for materialized view” Code Answer

  1. — Views (use USER_VIEWS or DBA_VIEWS if needed):
  2. SELECT TEXT FROM ALL_VIEWS WHERE upper(VIEW_NAME) LIKE upper(‘%VIEW_NAME%’);
  3. — Or:
  4. SELECT dbms_metadata.
  5. ​
  6. — Materialized views (use USER_VIEWS or DBA_VIEWS if needed):

Can you query a materialized view?

Once you create one or more materialized views, which are the equivalent of summaries, the end user can query the tables and views in the database.

What is Oracle materialized view log?

In an Oracle database, a materialized view log is a table associated with the master table of a materialized view. When master table data undergoes DML changes (such as INSERT, UPDATE, or DELETE), the Oracle database stores rows describing those changes in the materialized view log.

Can you index a materialized view?

A materialized view can be partitioned, and you can define a materialized view on a partitioned table. You can also define one or more indexes on the materialized view. Unlike indexes, materialized views can be accessed directly using a SELECT statement.

What is Materialised views in Oracle?

A materialized view is a database object that contains the results of a query. The FROM clause of the query can name tables, views, and other materialized views. Collectively these objects are called master tables (a replication term) or detail tables (a data warehousing term).

How do I find a materialized view in SQL?

To view a materialized view:

  1. On the Workspace home page, click SQL Workshop and then Object Browser. Object Browser appears.
  2. From the Object list, select Materialized Views.
  3. From the Object Selection pane, select a view. The Materialized View appears.

How can I get DDL of view?

For database re-architecture I need to get DDL of each table and view in the database(Oracle)….

  1. Simply replace TABLE with VIEW and Table_Name with a View_Name in your dbms_metadata. get_ddl() call.
  2. just be aware that text of view will/could be different from originally submitted. – vav.
  3. @NicholasKrasnov I tried the same.

Do materialized views have indexes?

What is Mlog?

MLOG$ Table. An MLOG$ table is the Snapshot Log table created against a base table. A row is inserted into the table each time a change (insert/update/delete) is made to the base table.

Can I create index on materialized view Oracle?

How do materialized views get refreshed?

Materialized views can be refreshed in two ways: fast or complete. A fast refresh requires having a materialized view log on the source tables that keeps track of all changes since the last refresh, so any new refresh only has changed (updated, new, deleted) data applied to the MV.

How do you extract DDL of a table in Oracle?

  1. Statement 1. CREATE TABLE My_Table (COLUMN1 VARCHAR2(1), COLUMN2 NUMBER(1)) Table created.
  2. Statement 2. BEGIN DBMS_METADATA. SET_TRANSFORM_PARAM(DBMS_METADATA.
  3. Statement 3. select DBMS_METADATA.GET_DDL(object_type, object_name) from user_objects where object_type = ‘TABLE’ and object_name = ‘MY_TABLE’

How do I extract DDL from SQL Developer?

In this exercise, you export all the object definitions and the data for the Departments table.

  1. Using the main menu, select Tools->Database Export.
  2. An Export wizard will open.
  3. Set the DDL Options for this Export.
  4. In this step, you can slect what Object Types to export.
  • September 22, 2022

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