Error : 8629 The query processor could not produce a query plan from the optimizer because a query cannot update a text, ntext, or image column and a clustering key at the same time.
SQL SERVER – Recovery Models and Selection
SQL Server offers three recovery models: full recovery, simple recovery and bulk-logged recovery. The recovery models determine how much data loss is acceptable and determines whether and how transaction logs can be backed up. Select Simple Recovery Model if: * Your data is not critical. * Losing all transactions since…
Read MoreSQL SERVER – LEN and DATALENGTH of NULL Simple Example
Simple but interesting – In recent survey I found that many developers making this generic mistake. I have seen following code in periodic code review. (The code below is not actual code, it is simple sample code) DECLARE @MyVar VARCHAR(10) SET @MyVar = NULL IF (LEN(@MyVar) = 0) … I…
Read MoreSQL SERVER – 2005 Find Table without Clustered Index – Find Table with no Primary Key
One of the basic Database Rule I have is that all the table must Clustered Index. Clustered Index speeds up performance of the query ran on that table. Clustered Index are usually Primary Key but not necessarily. I frequently run following query to verify that all the Jr. DBAs are…
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SQL SERVER – Change Default Fill Factor For Index
SQL Server has default value for fill factor is Zero (0). The fill factor is implemented only when the index is created; it is not maintained after the index is created as data is added, deleted, or updated in the table. When creating an index, you can specify a fill factor to leave extra gaps and reserve a percentage of free space on each leaf level page of the index to accommodate future expansion in the storage of the table’s data and reduce the potential for page splits. Let us learn about how to change default fill factor of index.
SQL SERVER – 2005 Understanding Trigger Recursion and Nesting with examples
Trigger events can be fired within another trigger action. One Trigger execution can trigger even on another table or same table. This trigger is called NESTED TRIGGER or RECURSIVE TRIGGER. Nested triggers SQL Server supports the nesting of triggers up to a maximum of 32 levels. Nesting means that when…
Read MoreSQL 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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