SQL SERVER – Disable Index – Enable Index – ALTER Index

There are few requirements in real world when Index on table needs to be disabled and re-enabled afterwards. e.g. DTS, BCP, BULK INSERT etc. Index can be dropped and recreated. I prefer to disable the Index if I am going to re-enable it again. USE AdventureWorks GO ----Diable Index ALTER INDEX [IX_StoreContact_ContactTypeID]…
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SQL SERVER – Fix: Error 130: Cannot perform an aggregate function on an expression containing an aggregate or a subquery

Fix: Error 130: Cannot perform an aggregate function on an expression containing an aggregate or a subquery Following statement will give the following error: “Cannot perform an aggregate function on an expression containing an aggregate or a subquery.” MS SQL Server doesn’t support it. USE PUBS GO SELECT AVG(COUNT(royalty)) RoyaltyAvg…
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SQL SERVER – DBCC commands List – documented and undocumented

Database Consistency Checker (DBCC) commands can gives valuable insight into what’s going on inside SQL Server system. DBCC commands have powerful documented functions and many undocumented capabilities. Current DBCC commands are most useful for performance and troubleshooting exercises. To learn about all the DBCC commands run following script in query…
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SQL SERVER – MS TechNet : Storage Top 10 Best Practices

This one of the very interesting article I read regarding SQL Server 2005 Storage. Please refer original article at MS TechNet here. Understand the IO characteristics of SQL Server and the specific IO requirements / characteristics of your application. More / faster spindles are better for performance. Try not to…
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SQL SERVER – UDF – Function to Parse AlphaNumeric Characters from String

Following function keeps only Alphanumeric characters in string and removes all the other character from the string. This is very handy function when working with Alphanumeric String only. I have used this many times. CREATE FUNCTION dbo.UDF_ParseAlphaChars ( @string VARCHAR(8000) ) RETURNS VARCHAR(8000) AS BEGIN DECLARE @IncorrectCharLoc SMALLINT SET @IncorrectCharLoc…
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