Database Concepts (8th Edition)
Database Concepts (8th Edition)
8th Edition
ISBN: 9780134601533
Author: David M. Kroenke, David J. Auer, Scott L. Vandenberg, Robert C. Yoder
Publisher: PEARSON
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Chapter 6, Problem 6.34RQ
Program Plan Intro

Cursor:

The term cursor is used to retrieve the information in row by row manner. If the records stored in the database table, which needs to be updated one row at a time is carried over by cursor.

  • It plays the major role for fetching a required row from the table in the database which holds numerous records.
  • Cursors are defined using SELECT statement.
  • It points the set of rows which is resulted from an SQL SELECT statement.
  • In general the cursor is placed in the first or last row.
  • It influences the performance of the SQL Server as it uses the SQL server instances memory, decrease network bandwidth, and reduction in concurrency.
  • It’s recommended to avoid the use of cursor and the cursor can be replaced with WHILE loop, temporary tables, and sub queries.
  • The types of cursor are listed below:
    • Forward-only cursor
    • Static cursor
    • Dynamic cursor
    • Keyset cursor

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