What is a global cursor?
Just like temporary tables, the scope of a cursor can be Local or Global. Global Cursors can be accessed anywhere in the program once they are declared whereas Local Cursors can be accessed only in the respective batch. There is an option to set whether the default cursor in a particular database is Global or Local.
Where cursors are stored in SQL Server?
SQL Server static cursors are always read-only. Because the result set of a static cursor is stored in a worktable in tempdb, the size of the rows in the result set cannot exceed the maximum row size for a SQL Server table.
What is the default cursor type in SQL Server?
Microsoft SQL Server supports the following 4 types of cursors. A static cursor populates the result set during cursor creation and the query result is cached for the lifetime of the cursor. A static cursor can move forward and backward. This is the default type of cursor.
What is the purpose of using global variables in cursors in SQL?
Global items maintain their state (for a variable, its value; for a cursor, as you are about to see, its status of open or closed and if open wherein the result set the cursor is pointing) until you explicitly change that state, your session terminates, or the package state is reset.
What can I use instead of cursor in SQL?
SQL Server Alternatives Cursor
- Using Cursor.
- Using Table Variable.
- Using Temporary Table.
Which is better while loop or cursor in SQL Server?
Always confusing thing is which one is better; SQL While loop or cursor? While SQL While loop is quicker than a cursor, reason found that cursor is defined by DECLARE CURSOR. Every emphasis of the loop will be executed inside system memory and consuming required server assets.
How can I see the cursor in SQL?
Difference between View and Cursor in SQL :
- Declare the cursor in declaration section.
- Open the cursor in execution section.
- Fetch the cursor to retrieve data into PL/SQL variable.
- Close the cursor to release allocated memory.
What is SQL cursor example?
A SQL Server cursor is a set of T-SQL logic to loop over a predetermined number of rows one at a time. The purpose for the cursor may be to update one row at a time or perform an administrative process such as SQL Server database backups in a sequential manner.
Can we declare cursor in package specification?
If you declare cursor in package body then it will be available for each program unit in package. but not available for plsql units abroad of package procedures and functions. In this approach you declare cursor specs in package specification without select statement.
How do you use a cursor in SQL Server?
Cursors (Transact-SQL) Microsoft SQL Server statements produce a complete result set, but there are times when the results are best processed one row at a time. Opening a cursor on a result set allows processing the result set one row at a time. You can assign a cursor to a variable or parameter with a cursor data type.
What is cursor_name in SQL Server?
Is the name of the Transact-SQL server cursor defined. cursor_name must conform to the rules for identifiers. Specifies that the scope of the cursor is local to the batch, stored procedure, or trigger in which the cursor was created. The cursor name is only valid within this scope.
When is the cursor deallocated in SQL Server?
The cursor is implicitly deallocated when the batch, stored procedure, or trigger terminates, unless the cursor was passed back in an OUTPUT parameter. If it is passed back in an OUTPUT parameter, the cursor is deallocated when the last variable referencing it is deallocated or goes out of scope.
What is the difference between Transact-SQL cursors and API cursors?
Transact-SQL cursors are implemented on the server and are managed by Transact-SQL statements sent from the client to the server. They may also be contained in batches, stored procedures, or triggers. API cursors support the API cursor functions in OLE DB and ODBC. API server cursors are implemented on the server.