By default dynamic cursors are scrollable.Ī forward only cursor is the fastest cursor among the all cursors but it doesn't support backward scrolling. Hence a dynamic cursor is sensitive to any changes to the data source and supports update, delete operations. SQL Server static cursors are always read-only.Ī dynamic cursor allows you to see the data updation, deletion and insertion in the data source while the cursor is open. By default static cursors are scrollable. No UPDATE, INSERT, or DELETE operations are reflected in a static cursor (unless the cursor is closed and reopened). Hence you should use it only if scrolling is required and other types of cursors are not suitable. A static cursor is slower and use more memory in comparison to other cursor. A static cursor can move forward and backward direction. Types of CursorsĪ static cursor populates the result set at the time of cursor creation and the query result is cached for the lifetime of the cursor. We should use cursor in that case when there is no option except cursor. Basically you should use cursor alternatives like as WHILE loop, sub queries, Temporary tables and Table variables. Hence it is mandatory to understand the cursor types and its functions so that you can use suitable cursor according to your needs. I have already explained the SQL Server Basics of Cursors.Ī Cursor impacts the performance of the SQL Server since it uses the SQL Server instances' memory, reduce concurrency, decrease network bandwidth and lock resources.
TSQL CURSORS UPDATE
Cursor are required when we need to update records in a database table one row at a time. Difference between CTE and Temp Table and Table VariableĪ Cursor allow us to retrieve data from a result set in singleton fashion means row by row.
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TSQL CURSORS HOW TO
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