Updating views in oracle


10-Apr-2019 20:37

A materialized view, or snapshot as they were previously known, is a table segment whose contents are periodically refreshed based on a query, either against a local or remote table.Using materialized views against remote tables is the simplest way to achieve replication of data between sites.This allows the work to be done once and used repeatedly by multiple sessions, reducing the total load on the server.A view is nothing more than a SQL statement that is stored in the database with an associated name. A view derives its data from the tables on which it is based. Views can be based on actual tables or another view also.Views are very powerful and handy since they can be treated just like any other table but do not occupy the space of a table.A view can be created from one or many tables which depends on the written SQL query to create a view.

Remember, refreshing on commit is a very intensive operation for volatile base tables.The basic CREATE VIEW syntax is as follows − ---- ---------- ----- ----------- ---------- | ID | NAME | AGE | ADDRESS | SALARY | ---- ---------- ----- ----------- ---------- | 1 | Ramesh | 32 | Ahmedabad | 2000.00 | | 2 | Khilan | 25 | Delhi | 1500.00 | | 3 | kaushik | 23 | Kota | 2000.00 | | 4 | Chaitali | 25 | Mumbai | 6500.00 | | 5 | Hardik | 27 | Bhopal | 8500.00 | | 6 | Komal | 22 | MP | 4500.00 | | 7 | Muffy | 24 | Indore | 10000.00 | ---- ---------- ----- ----------- ---------- The WITH CHECK OPTION is a CREATE VIEW statement option.The purpose of the WITH CHECK OPTION is to ensure that all UPDATE and INSERTs satisfy the condition(s) in the view definition.Views can be created from a single table, multiple tables or another view.

updating views in oracle-54

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To create a view, a user must have the appropriate system privilege according to the specific implementation.

The example code in this article assumes DB1 is the master instance and DB2 is the materialized view site.