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Oracle Interview Questions and Answers



Can u have OLE objects in forms?
Yes.

Can u have VBX and OCX controls in forms ?
Yes.

What r the types of windows (Window style)?
Specifies whether the window is a Document window or a Dialog window.

What is OLE Activation style property?
Specifies the event that will activate the OLE containing item.

Can u change the mouse pointer ? How?
Yes. Specifies the mouse cursor style. Use this property to dynamically change the shape of the cursor.

How many types of columns are there and what are they
Formula columns :: For doing mathematical calculations and returning one value Summary Columns :: For doing summary calculations such as summations etc. Place holder Columns :: These columns are useful for storing the value in a variable

Can u have more than one layout in report
It is possible to have more than one layout in a report by using the additional layout option in the layout editor.

Can u run the report with out a parameter form
Yes it is possible to run the report without parameter form by setting the PARAM value to Null

What is the lock option in reports layout
By using the lock option we cannot move the fields in the layout editor outside the frame. This is useful for maintaining the fields .

What is Flex
Flex is the property of moving the related fields together by setting the flex property on

What are the minimum number of groups required for a matrix report
The minimum of groups required for a matrix report are 4 e -----

What is a Synonym ?
A synonym is an alias for a table, view, sequence or program unit.

What is a Sequence ?
A sequence generates a serial list of unique numbers for numerical columns of a database's tables.

What is a Segment ?
A segment is a set of extents allocated for a certain logical structure.

What is schema?
A schema is collection of database objects of a User.

Describe Referential Integrity ?
A rule defined on a column (or set of columns) in one table that allows the insert or update of a row only if the value for the column or set of columns (the dependent value) matches a value in a column of a related table (the referenced value). It also specifies the type of data manipulation allowed on referenced data and the action to be performed on dependent data as a result of any action on referenced data.

What is Hash Cluster ?
A row is stored in a hash cluster based on the result of applying a hash function to the row's cluster key value. All rows with the same hash key value are stores together on disk.

What is a Private Synonyms ?
A Private Synonyms can be accessed only by the owner.

What is Database Link ?
A database link is a named object that describes a "path" from one database to another.

What is index cluster?
A cluster with an index on the cluster key.

What is hash cluster?
A row is stored in a hash cluster based on the result of applying a hash function to the row's cluster key value. All rows with the same hash key value are stores together on disk.

When can hash cluster used?
Hash clusters are better choice when a table is often queried with equality queries. For such queries the specified cluster key value is hashed. The resulting hash key value points directly to the area on disk that stores the specified rows.

When can hash cluster used?
Hash clusters are better choice when a table is often queried with equality queries. For such queries the specified cluster key value is hashed. The resulting hash key value points directly to the area on disk that stores the specified rows.

What are the types of database links?
Private database link, public database link & network database link.

What is private database link?
Private database link is created on behalf of a specific user. A private database link can be used only when the owner of the link specifies a global object name in a SQL statement or in the definition of the owner's views or procedures.

What is public database link?
Public database link is created for the special user group PUBLIC. A public database link can be used when any user in the associated database specifies a global object name in a SQL statement or object definition.

What is network database link?
Network database link is created and managed by a network domain service. A network database link can be used when any user of any database in the network specifies a global object name in a SQL statement or object definition.

What is data block?
Oracle database's data is stored in data blocks. One data block corresponds to a specific number of bytes of physical database space on disk.

How to define data block size?
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.

What is row chaining?
In circumstances, all of the data for a row in a table may not be able to fit in the same data block. When this occurs, the data for the row is stored in a chain of data block (one or more) reserved for that segment.

What is an extent?
An extent is a specific number of contiguous data blocks, obtained in a single allocation and used to store a specific type of information.

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