Many times I have seen issue of SELECT 1 vs SELECT * discussed in terms of performance or readability while checking for existence of rows in table. I ran quick 4 tests about this observed that I am getting same result when used SELECT 1 and SELECT *. I think smart readers of this blog will come up the situation when SELECT 1 and SELECT * have different execution plan when used to find existence of rows.
SQL SERVER – Index Reorganize or Index Rebuild
Recently, I have received one question quite often about when to Index Reorganize and when to Index Rebuild. I have already written about this topic earlier but it seems that many are unable to search it. SQL SERVER – Difference Between Index Rebuild and Index Reorganize Explained with T-SQL Script…
Read MoreSQL SERVER – Introduction to Performance Monitor – How to Use Perfmon
Yesterday I wrote about SQL SERVER – Introduction to Three Important Performance Counters. I received few questions about how to use Perfmon. Here is very brief introduction to Perfmon. There are three ways to launch Perfmon. 1) Type “start perfmon” at the command prompt. 2) Go to Start | Programs…
Read MoreSQL SERVER – Introduction to Three Important Performance Counters
Performance Counters are very important to evaluate. There are more than thousands of Performance Counters. Today I will cover three basic but very important Performance Counters. Processor:% Processor Time It reports the total processor time with respect to the available capacity of the server. If counter is between 50 to…
Read MoreSQL SERVER – 2005 – Find Unused Indexes of Current Database
Simple but accurate following script will give you list of all the indexes in the database which are unused. If indexes are not used they should be dropped as Indexes reduces the performance for INSERT/UPDATE statement. Indexes are only useful when used with SELECT statement. Script to find unused Indexes.…
Read MoreSQL SERVER – Time Out Due to Executing DELETE on Large RecordSet
Just a day ago, I received following question: “I have large table more than 1M rows. I want to delete every row in my table. Everytime I ran DELETE statement, it times out and does not do it job. The data in table is useless and I do not need…
Read MoreSQL SERVER – 2005 – Display Fragmentation Information of Data and Indexes of Database Table
One of my friend involved with large business of medical transcript invited me for SQL Server improvement talk last weekend. I had great time talking with group of DBA and developers. One of the topic which was discussed was how to find out Fragmentation Information for any table in one…
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