Microsoft has released a tool called the Microsoft SQL Server Best Practices Analyzer. With this tool, you can test and implement a combination of SQL Server best practices and then implement them on your SQL Server. The SQL Server 2005 Best Practices Analyzer gathers data from Microsoft Windows and SQL…Read More
Index Scan retrieves all the rows from the table. Index Seek retrieves selective rows from the table.
This question is asked many times to me. What is difference between DISTINCT and GROUP BY? A DISTINCT and GROUP BY usually generate the same query plan, so performance should be the same across both query constructs. GROUP BY should be used to apply aggregate operators to each group. If…Read More
SQL SERVER – @@IDENTITY vs SCOPE_IDENTITY() vs IDENT_CURRENT – Retrieve Last Inserted Identity of Record
SELECT @@IDENTITY It returns the last IDENTITY value produced on a connection, regardless of the table that produced the value, and regardless of the scope of the statement that produced the value. @@IDENTITY will return the last identity value entered into a table in your current session. While @@IDENTITY is…Read More
DBCC FREEPROCCACHE will invalidate all stored procedure plans that the optimizer has cached in memory. Let us learn how to clean cache.