How do I manually refresh my Mview?

How do I manually refresh my Mview?

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 materialized view?

1. Query Rewrite Method 1: Text Match Rewrite.
2. Query Rewrite Method 2: Join Back.
3. Query Rewrite Method 3: Aggregate Computability.
4. Query Rewrite Method 4: Aggregate Rollup.
5. Query Rewrite Method 5: Rollup Using a Dimension.
6. Query Rewrite Method 6: When Materialized Views Have Only a Subset of Data.

Can we update Mview?

To update the data in a materialized view, you can use the REFRESH MATERIALIZED VIEW statement at any time. When you use this statement, Amazon Redshift identifies changes that have taken place in the base table or tables, and then applies those changes to the materialized view.

How do I refresh a force on demand materialized view in Oracle?

To refresh ON DEMAND materialized views we explicitly call one of the following procedures.

1. DBMS_MVIEW.REFRESH.
2. DBMS_MVIEW.REFRESH_ALL_MVIEWS.
3. DBMS_MVIEW.REFRESH_DEPENDENT.

How can I speed up a materialized view refresh?

– Use super-fast solid-state disks – The easiest and most reliable way is to speed-up a materialized view refresh is to move the target tables and MV’s to SSD. SSD runs several hundred times faster than platter disk, and it plops right in, just a few hours to install.

How do I REFRESH MATERIALIZED views?

Materialized views can be refreshed either on demand or at regular time intervals. Alternatively, materialized views in the same database as their base tables can be refreshed whenever a transaction commits its changes to the base tables.

What if the refresh method is not specified in the view?

If the refresh method is not specified, the default refresh method as specified in the materialized view definition is used. An alternative to specifying the materialized views to refresh is to use the procedure DBMS_MVIEW.REFRESH_ALL_MVIEWS.

Are materialized view logs compatible with each other for fast refresh?

When a materialized view is created on both base tables with timestamp-based materialized view logs and base tables with commit SCN-based materialized view logs, an error (ORA-32414) is raised stating that materialized view logs are not compatible with each other for fast refresh.

When does a complete refresh of a view occur?

A complete refresh occurs when the materialized view is initially created when it is defined as BUILD IMMEDIATE, unless the materialized view references a prebuilt table or is defined as BUILD DEFERRED. Users can perform a complete refresh at any time after the materialized view is created.