what is cursor ? where we use cursor ?

Question

Satyapriya Nayak · Answer

Hi Sathish Cursors allow row-by-row processing of the result sets. Types of cursors: Static Dynamic Forward-only Keyset-driven. Disadvantages of cursors: Each time you fetch a row from the cursor it results in a network roundtrip where as a normal SELECT query makes only one roundtrip  however large the resultset is. Cursors are also costly because they require more resources and temporary storage (results in more IO operations). Further there are restrictions on the SELECT statements that can be used with some types of cursors. Most of the times set based operations can be used instead of cursors. Please refer the below link for the example of Types of cursors http://www.dotnet-tricks.com/Tutorial/sqlserver?id=RLID060512&title=SQL%20Server%20-%20Types%20of%20Cursors Thanks

Senthilkumar · Answer

Cursor is iteration mechanism in sql server it will involves lot of memory operation. when you have a requirement to iterate the sql server table or views to fetch the row by row then cursor needs to achieve this operation.

Jignesh Trivedi · Answer

hi A cursor is a set of rows together with a pointer that identifies a current row. Simply when you want to perform Row by row Opration on SQL Table or query then you may use Cursor. please refer http://publib.boulder.ibm.com/infocenter/db2luw/v9/index.jsp?topic=%2Fcom.ibm.db2.udb.apdv.sql.doc%2Fdoc%2Fc0024361.htm http://publib.boulder.ibm.com/infocenter/db2luw/v9/index.jsp?topic=%2Fcom.ibm.db2.udb.apdv.sql.doc%2Fdoc%2Fc0024361.htm hope this will help you.