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Question: What is the use of indexes?Explain about it?

Answer: index are those which are used to speed up row retrieval from a table.oracle automatically creates an index for primary and unique keys.
Syntax:Create index index_name ontable_name (column1_name,column2_name,.....)[no sort]



Category SQL Interview Questions & Answers - Exam Mode / Learning Mode
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Question: What is the use of indexes?Explain about it?
Answer:

index are those which are used to speed up row retrieval from a table.oracle automatically creates an index for primary and unique keys.
Syntax:Create index index_name ontable_name (column1_name,column2_name,.....)[no sort] Source: CoolInterview.com

Answered by: penumarthi gopi baswanth | Date: 11/1/2007 | Contact penumarthi gopi baswanth Contact penumarthi gopi baswanth

Index is a schema object that can speed up the retrieval of data by using a pointer.Index provides direct and fast access to rows by using indexed path to locate data quickly.
Index creates automatically and we can also create.
syntax:
create index index_name to table_name(column _name) Source: CoolInterview.com

Answered by: sundeep malik | Date: 2/5/2008 | Contact sundeep malik Contact sundeep malik

Indexes mean speed of accessing the data in the table. Source: CoolInterview.com

Answered by: Sathish S | Date: 10/13/2009 | Contact Sathish S Contact Sathish S

Create Index IndexName on Tablename(ColumnName,ColumnName1,ColumnName2) Source: CoolInterview.com

Answered by: sundar | Date: 11/6/2009 | Contact sundar Contact sundar

An index is a database object, which is used to improve the performance while querying your data.
When you put CARD in atm machine it will display your name imm.
Ex:
Welcome Mr. Kiran
It is happening because of index. If the table doesnt have index it will take minimum 10mins to retrieve the card holders information. Source: CoolInterview.com

Answered by: KIRAN | Date: 8/16/2010 | Contact KIRAN Contact KIRAN

Index is an ordering of the records in the database according to the values in a particular fields.
They are two types:
1) clustered indexes.
2) non-clustered indexes. Source: CoolInterview.com

Answered by: mohan kumar | Date: 9/7/2010 | Contact mohan kumar Contact mohan kumar


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