Working of Materialization View
Definition
A materialization view is nothing but, it is a query that fetches the data from one or more tables in the database. The query can be involved the operations such as joins, filtering, and aggregations.
Creation
The materialized view is defined, and the view is created using the CREATE MATERIALIZED VIEW statement in the SQL. The database system executes the query and stores the result set the same as the table-like structure in the database.
Data Refresh
These are unlike regular views, which store the queries that is re-executed every time they are queried, materialized views store the data strongly. so, that the data can be over time due to the changes in the underlying tables. Hence, materialized views typically need to be refreshed the periodically to ensure that the reflect the up to date data. This is only done by the manually or automatically based on the schedule or on certain triggers like data or information modified in underlying tables.
Query Optimization
In Query Optimization, database systems are offered with the capability of rewriting, which automatically optimizes and replaces the query within the reference to materialization view when it will satisfy the requirements of the query. This optimization can expand the performance of the query by ignoring crucial computations and reducing the workload on the database server.
Storage
Materialization views are the same as regular tables and occupy the storage space of the database server. The storage of the materialization view depends on the size of the result set that is produced by the underlying query.
Creation
Materialized views are created by executing a query against one or more tables in the database. The results of the query are stored as a static dataset in the materialization view.
Refreshing
Refreshing is nothing, but the materialized views are refreshing to the synchronized data with the changes in the regular tables. It depends on the database system and the database configuration; the materialization view can be manually refreshed on a scheduled basis or automatically triggered by changes to the data.
Materialization View in DBMS
A materialization view is nothing but a snapshot or materialized query table. It is a database object that stores the results of the query table. Materialized views in the Database Management System (DBMS) work as the existing snapshots of the data, reducing the computational overhead. Unlike standard views, which are data that is virtually dynamically generated when the materialization view contains original data that exists in the database until the data is modified or truncated.
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