SQL Performance Archives - Page 68 of 101 - SQL Authority with Pinal Dave

SQL SERVER – Difference Between DATETIME and DATETIME2

June 11, 2010

SQL, SQL Performance, SQL Server, SQL Tips and Tricks

Yesterday I have written a very quick blog post on SQL SERVER – Difference Between GETDATE and SYSDATETIME and I got tremendous response for the same. I suggest you read that blog post before continuing with this blog post today. I had asked people to honestly take part and share…

SQL SERVER – Fastest Way to Restore Database

June 9, 2010

Pinal Dave

SQL Performance

SQL Restore, SQL Server

A few days ago, I received following email from blog reader where the question was about the fastest way to restore database.

SQL SERVER – Subquery or Join – Various Options – SQL Server Engine Knows the Best – Part 2

June 7, 2010

Pinal Dave

SQL, SQL Performance, SQL Server, SQL Tips and Tricks

SQL Joins, SQL Scripts

This blog post is part 2 of the earlier written article SQL SERVER – Subquery or Join – Various Options – SQL Server Engine knows the Best by Paulo R. Pereira. Paulo has left excellent comment to earlier article once again proving the point that SQL Server Engine is smart…

SQL SERVER – Subquery or Join – Various Options – SQL Server Engine knows the Best

June 6, 2010

Pinal Dave

SQL, SQL Performance, SQL Server, SQL Tips and Tricks

SQL Joins, SQL Scripts

This is followup post of my earlier article SQL SERVER – Convert IN to EXISTS – Performance Talk, after reading all the comments I have received I felt that I could write more on the same subject to clear few things out. First let us run following four queries, all…

SQL SERVER – Convert IN to EXISTS – Performance Talk

June 5, 2010

Pinal Dave

SQL Performance

SQL Scripts, SQL Server

In recent training one of the attendee asked if I can show a simple method to convert IN clause to EXISTS clause so it impacts performance. Here is the simple example.

SQL SERVER – Disabled Index and Update Statistics

May 28, 2010

Pinal Dave

SQL Performance

SQL Index, SQL Scripts, SQL Server, SQL Statistics

When we try to update the statistics, it throws an error as if the clustered index is disabled. Now let us enable the clustered index only and attempt to update the statistics of the table right after that. Let us learn about Disabled Index and Update Statistics.

SQL SERVER – Simple Example of Snapshot Isolation – Reduce the Blocking Transactions

May 21, 2010

Pinal Dave

SQL, SQL Performance, SQL Server, SQL Tips and Tricks

SQL Scripts, Transaction Isolation

To learn any technology and move to a more advanced level, it is very important to understand the fundamentals of the subject first. Today, we will be talking about something which has been quite introduced a long time ago but not properly explored when it comes to the isolation level.…