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SQL Server Cursor Guide

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What is a Cursor: Cursor is a T-SQL logic looping over predetermined rows one at a time
Used for database backups, serial processing, and administrative tasks
Multiple types exist including Read_Only, Fast_Forward, and Local
Implementation Steps: Declare variables and initialize them
Declare cursor with specific name
Fetch records and perform data processing
Close and deallocate cursor when done
When to Use: Serialized processing and administrative tasks
Large data sets where memory constraints exist
Reporting where referential integrity is needed
When SET-based logic is more feasible
Alternatives: INSERT/UPDATE/DELETE statements for single transactions
SSIS for data processing between databases
CASE expressions instead of dynamic SQL
Batching for large data sets
Considerations: Cursors may not scale well with large data sets
Performance impact depends on data size and server resources
Alternative solutions should be evaluated before using cursors