Do a view contain data?

1 Answer

Answer :

Views do not contain or store data.

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Description : Do View contain Data ?

Last Answer : Views do not contain or store data.

Description : What view would you use to look at the size of a data file?

Last Answer : DBA_DATA_FILES

Description : What is a view? How it is related to data independence?

Last Answer : A view may be thought of as a virtual table, that is, a table that does not really exist in its own right but is instead derived from one or more underlying base table. In other ... users from the effects of restructuring and growth in the database. Hence accounts for logical data independence.

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Description : Can a view be updated/inserted/deleted? If Yes under what conditions ?

Last Answer : A View can be updated/deleted/inserted if it has only one base table if the view is based on columns from one or more tables then insert, update and delete is not possible.

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Last Answer : If changes are made to the tables which are base tables of a view will the changes be reference on the view.

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Last Answer : To protect some of the columns of a table from other users.To hide complexity of a query.To hide complexity of calculations.

Description : What is a view ?

Last Answer : A view is stored procedure based on one or more tables, it’s a virtual table.

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Last Answer : A canvas-view is the background object on which you layout the interface items (text-items, check boxes, radio groups, and so on.) and boilerplate objects that operators see and interact with as they ... assigned to a specific canvas. Each canvas, in term, must be displayed in a specific window.

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Last Answer : A content view is the "Base" view that occupies the entire content pane of the window in which it is displayed. A stacked view differs from a content canvas view in that it is not the base view for the window to which it is assigned

Description : Can you have more than one content canvas view attached with a window?

Last Answer : Yes. Each window you create must have atleast one content canvas view assigned to it. You can also create a window that has manipulated content canvas view. At run time only one of the content canvas views assign to a window is displayed at a time.

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Last Answer : Query v$fixed_view_definition. Example: SELECT * FROM v$fixed_view_definition WHERE view_name='V$SESSION';

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Last Answer : A view is a virtual table. Every view has a Query attached to it. (The Query is a SELECT statement that identifies the columns and rows of the table(s) the view uses.)

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Last Answer : Yes.

Description : What is an Oracle view?

Last Answer : A view is a virtual table. Every view has a query attached to it. (The query is a SELECT statement that identifies the columns and rows of the table(s) the view uses.)

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Last Answer : It specifies user views and their mappings to the conceptual schema.

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Last Answer : A view is a select that is executed each time an user accesses to it. A materialized view stores the result of this query in memory for faster access purposes.

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Last Answer : SELECT COUNT(*),USERNAME FROM V$SESSION GROUP BY USERNAME;

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Last Answer : Yes

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Last Answer : A Control file records the physical structure of the database. It contains the following information. Database Name Names and locations of a database's files and redolog files. Time stamp of database creation.

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Last Answer : Views do not contain or store data.

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Last Answer : No

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Description : What are the characteristics of data files?

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Description : What is a data segment?

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Description : How to define data block size?

Last Answer : A data block size is specified for each Oracle database when the database is created. A database users and allocated free database space in Oracle data blocks. Block size is specified in init.ora file and cannot be changed latter.

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