What is the Difference Between Scrollable and Non Scrollable Cursors in DB2

The main difference between scrollable and non scrollable cursors in DB2 is that scrollable cursors are used to move randomly through the result set while non-scrollable cursors are used to move sequentially forward through the result set. ... A cursor can process a single row, but it can hold multiple rows at a time.

1. What is scrollable cursor in DB2?
2. What is scroll cursor in SQL Server?
3. Why cursor is used in DB2?
4. What is cursor and types of cursor?
5. How does a cursor work?
6. What is declare cursor?
7. What is @@ Fetch_status in SQL Server?
8. What can I use instead of cursor in SQL Server?
9. What occurs when a cursor is opened?
10. What is null indicator in DB2?
11. What is the difference between cursor and select statement?

What is scrollable cursor in DB2?

With scrollable cursors, you can move directly to the rows you want without having to FETCH every other row returned by the cursor. In DB2 V7, scrollable cursors require you to use declared temporary tables, another new feature of DB2 Version 7.

What is scroll cursor in SQL Server?

In modern screen-based applications, the user scrolls backward and forward through the data. ... A scrollable cursor is commonly used in modern screen-based applications in which the user scrolls back and forth through the data.

Why cursor is used in DB2?

In Db2, an application program uses a cursor to point to one or more rows in a set of rows that are retrieved from a table. You can also use a cursor to retrieve rows from a result set that is returned by a stored procedure. Your application program can use a cursor to retrieve rows from a table.

What is cursor and types of cursor?

Cursor is a Temporary Memory or Temporary Work Station. It is Allocated by Database Server at the Time of Performing DML operations on Table by User. Cursors are used to store Database Tables. There are 2 types of Cursors: Implicit Cursors, and Explicit Cursors.

How does a cursor work?

The major function of a cursor is to retrieve data, one row at a time, from a result set, unlike the SQL commands which operate on all the rows in the result set at one time. Cursors are used when the user needs to update records in a singleton fashion or in a row by row manner, in a database table.

What is declare cursor?

DECLARE CURSOR defines the attributes of a Transact-SQL server cursor, such as its scrolling behavior and the query used to build the result set on which the cursor operates. The OPEN statement populates the result set, and FETCH returns a row from the result set.

What is @@ Fetch_status in SQL Server?

@@FETCH_STATUS (Transact-SQL)

This function returns the status of the last cursor FETCH statement issued against any cursor currently opened by the connection.

What can I use instead of cursor in SQL Server?

In this article, we'll look at some alternatives to using SQL cursors which can help avoid performance issues caused by using cursors.
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The process of using a SQL cursor can be generally described as follows:

1. Declare Cursor.
2. Open Cursor.
3. Fetch rows.
4. Close Cursor.
5. Deallocate Cursor.

What occurs when a cursor is opened?

When a cursor is opened, the following things happen: The values of the bind variables are examined. Based on the values of the bind variables, the active set (the query result) is determined. The active set pointer is set to the first row.

What is null indicator in DB2?

The null indicator is used by DB2 to track whether its associated column is null or not. A positive value or a value of 0 means the column is not null and any actual value stored in the column is valid. ... A negative value indicates that the column is set to null.

What is the difference between cursor and select statement?

In embedded sql which is written within COBOL-DB2 program, SELECT statement can retrieve only one row at a time. So inorder to multiple rows we make use of cursor which retrieves multiple rows from a table. Select * can be given in SPUFI to retrieve all the rows in the table.