Tuesday, October 12, 2010

Cursor Type (SQL Server )

Keyset-Driven Cursors

Dynamic Cursors

Forward-Only Cursors:

1. operate directly on the base table
2. suppport DML operations
3. support forward scrolling only (FETCH NEXT)
4. Fast_Forward (forward_only + read_only cursor)

Static Cursors:

1. operate on the snapshot in the tempdb database.
2. data is retrived from the underlying table(s) when the cursor is opened.
3. support all scrolling options: FETCH FRIST, FETCH PRIOR, FETCH LAST, FETCH ABSOLUT n, and FETCH RELATIVE n.
4. read-only, changes (DML ) made to the underlying table(s) are not reflected in the cursor.

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