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.

What is a main difference between regular views and materialized views?

Views are generally used when data is to be accessed infrequently and data in table get updated on frequent basis. On other hand Materialized Views are used when data is to be accessed frequently and data in table not get updated on frequent basis.

What are the advantages of views?

Views can provide advantages over tables:

  • Views can represent a subset of the data contained in a table.
  • Views can join and simplify multiple tables into a single virtual table.
  • Views can act as aggregated tables, where the database engine aggregates data (sum, average, etc.)
  • Views can hide the complexity of data.

Do views use memory?

Views are a special version of tables in SQL. The view is a query stored in the data dictionary, on which the user can query just like they do on tables. It does not use the physical memory, only the query is stored in the data dictionary.

What are 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).

Does view create new table?

The advantage of a view is that it can join data from several tables thus creating a new view of it. Say you have a database with salaries and you need to do some complex statistical queries on it. So the view is actual a table that was made by a select statement.

What are the disadvantages of views?

Although there are many advantages to views, the main disadvantage to using views rather than real tables is performance degradation. Because views only create the appearance of a table, not a real table, the query processor must translate queries against the view into queries against the underlying source tables.