How do I view materialized view logs?

How do I view materialized view logs?

all_mview_logs will show you all the materialized view logs that you have access to. user_mview_logs will show you all the materialized view logs that you own.

How do I create a materialized view log in Oracle?

CREATE MATERIALIZED VIEW LOG ON tableName [WITH [PRIMARY KEY][,ROWID]|[ROWID][,PRIMARY KEY] [(columnName[,…])]] List of columns for which changes will be recorded in the log. Use the WITH clause to indicate the keys and columns for which changes will be recorded in the materialized view log.

Where does materialized view log table 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.

What’s the purpose of a materialized view log when is it required?

Materialized View Logs in Oracle A materialized view log is required on a master if we want to fast refresh materialized views based on the master. When we create a materialized view log for a master table or master materialized view, Oracle creates an underlying table as the materialized view log.

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.

How do I manually refresh a materialized view in Oracle?

1. Set the initialization parameters and bounce the database.
2. Create the materialized view table.
3. Create the optimizer statistics and refresh the materialized view.
4. Test the materialized view.
5. Create the MVIEW log(s) MATERIALIZED VIEW.
6. Execute a manual complete refresh.

How do you refresh a materialized view in Oracle?

To refresh the Oracle materialized view, call one of the procedures in DBMS_MVIEW. The DBMS_MVIEW package provides three types of refresh operations: DBMS_MVIEW. REFRESH: Refreshes one or more Oracle materialized views.

How do I drop materialized view log?

To drop a materialized view log, you must have the privileges needed to drop a table. Specify the schema containing the materialized view log and its master table. If you omit schema , then Oracle Database assumes the materialized view log and master table are in your own schema.

How do you update a materialized view in Oracle?

Use the ALTER MATERIALIZED VIEW statement to modify an existing materialized view in one or more of the following ways:

1. To change its storage characteristics.
2. To change its refresh method, mode, or time.
3. To alter its structure so that it is a different type of materialized view.
4. To enable or disable query rewrite. Note:

What is materialized view in Oracle 11g with example?

A materialized view in Oracle is a database object that contains the results of a query. They are local copies of data located remotely, or are used to create summary tables based on aggregations of a table’s data. A materialized view can query tables, views, and other materialized views.

Why do we use materialized view in Oracle?

Materialized View Concepts Oracle uses materialized views (also known as snapshots in prior releases) to replicate data to non-master sites in a replication environment and to cache expensive queries in a data warehouse environment.

When to use a materialized view?

Materialized views are primarily used to increase application performance when it isn’t feasible or desirable to use a standard view with indexes applied to it. Materialized views can be updated on a regular basis either through triggers or by using the ON COMMIT REFRESH option.

Is materialized view refreshed automatically?

A materialized view can be refreshed automatically using the ON COMMIT method. Therefore, whenever a transaction commits which has updated the tables on which a materialized view is defined, those changes are automatically reflected in the materialized view.

Can I rename a materialized view?

Such materialized views can be queried but can’t be refreshed. In this case, you must drop and recreate the materialized view. In general, you can’t alter a materialized view’s definition (its SQL statement). You can’t rename a materialized view.