Database ppt[}}.pptx database system and

Database ppt[}}.pptx database system and

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  THE INNOV-8ERS Presente d By:Muhammad Ahmad-165 Zujaja Arif- 132 Database Structure
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  Discussion Topics: Creating Views Removing Views Restrictionson Views Updating Views Advantages and Disadvantages View Materialization
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  What is view View is result set of stored query  Read only vs updatable view  materialized view  Data is in the virtual table not stored permanent View display only selected data View is also know as stored select statement View is logical table based on one or more table or views The table upon which a view is base
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  Restriction on views Views indatabases are powerful tools, but they come with certain restrictions or limitations due to their virtual nature and dependency on underlying tables. No Physical Storage  No Support for Some DML Operations Dependency on Base Tables  Performance Issues  Limited Trigger Support  Complex Security Management
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  Updating views Updating aview in a database involves altering its definition without deleting and recreating it. Steps: Recreate the view Test the view Modify the Query
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  Purpose: Updating a viewchanges its underlying query to reflect new requirements without altering the view's name or structure. When to use: The underlying table structure changes. New business requirements arise, needing a different data perspective.
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  Advantages of views. Simplify complex queries Providedata abstraction Enhance security Improve performance
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  Disadvantage s of views Canbe slower than querying underlying tables directly Can be more difficult to maintain and update- Can lead to data inconsistencies if not properly synchronized with underlying tables  Can be dependent on underlying tables, which can lead to
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  Views Materialization  Materialization inViews refers to the process of physically storing the result of a view query in the database, rather than dynamically computing it each time the view is accessed.  Materialization in views is an optimization technique to improve query performance by physically storing the results of a query.  Materialized views are particularly
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  Thank You!!!