How materialized view refresh works in SQL Server?

How do you refresh a materialized view in SQL Server?

Oracle Database can use this materialized view log to perform fast refreshes for all fast-refresh-able materialized views based on the master table. To fast refresh a materialized join view, you must create a materialized view log for each of the tables referenced by the materialized views.

How can use materialized view in SQL Server?

Materialized views in Microsoft SQL Server

  1. select p. ProductID, sum(t. …
  2. from Production. TransactionHistory t inner join Production. …
  3. select p. ProductID, sum(t. …
  4. from Production. TransactionHistory t inner join Production. …
  5. create unique clustered index TotalCostQuantityByProduct on v_TotalCostQuantityByProduct (ProductID)

How do I know if materialized view refresh is running?

select * from dba_refresh;select * from dba_refresh_children; select * from sys. v_$mvrefresh; Then below query to find the status of job.

What is a materialized view in SQL?

A materialized view is a database object that contains the results of a query. … You can select data from a materialized view as you would from a table or view. In replication environments, the materialized views commonly created are primary key, rowid, object, and subquery materialized views.

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What is fast refresh in materialized view?

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. A complete refresh does what it says: it completely refreshes all data in the MV.

What is the benefit of materialized view?

the big advantage of a Materialized View is extremely fast retrieval of aggregate data, since it is precomputed and stored, at the expense of insert/update/delete. The database will keep the Materialized View in sync with the real data, no need to re-invent the wheel, let the database do it for you.

Why materialized view is used?

Materialized views are basically used to increase query performance since it contains results of a query. They should be used for reporting instead of a table for a faster execution.

What is difference between view and materialized view?

Materialized views are disk based and are updated periodically based upon the query definition. Views are virtual only and run the query definition each time they are accessed.

How do I check my MV refresh time?


  1. SELECT.
  2. OWNER,
  4. to_char(last_refresh_date, ‘yyyymmddhh24miss’) LAST_REFRESH_DATE.
  5. FROM all_mviews.
  6. WHERE owner = ‘MY_OWNER_NAME’

Does view refresh automatically?

Yes, they are updated, every time you use them.

How long does a materialized view take to refresh?

The simplest form to refresh a materialized view is a Complete Refresh. It loads the contents of a materialized view from scratch. This means, if the SQL query of the materialized view has an execution time of two hours, the Complete Refresh takes at least two hours as well – or ofter even longer.

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Why materialized view is faster than view?

Materialized View responds faster in comparison to View. It is because the materialized view is precomputed and hence, it does not waste time in resolving the query or joins in the query that creates the Materialized View. Which in turn responses faster to the query made on materialized view.

Can we create indexes on views?

Indexes can only be created on views which have the same owner as the referenced table or tables. This is also called an intact ownership-chain between the view and the table(s). Typically, when table and view reside within the same schema, the same schema-owner applies to all objects within the schema.