SQL Server Helper - Frequently Asked Questions - SQL Server 2005 - VARCHAR(MAX), NVARCHAR(MAX), VARBINARY(MAX) Using Large Value Types. In previous versions of SQL Server, working with large value data types required special handling.
Large value data types are those that exceed the maximum row size of 8 KB. SQL Server 2005 introduces a max specifier for varchar, nvarchar and varbinary data types to allow storage of values as large as 2^31 -1 bytes. Table columns and Transact-SQL variables may specify varchar(max), nvarchar(max) or varbinary(max) data types. Previously, only SQL Server data types such as text, ntext and image could attain such lengths. Compiled » Why is SQL Server So Slow? I’ve been asked this question a few times when looking into performance problems on a website, and the short answer is, it’s not.
SQL Server is a very efficient database. It’s important to remember that a database is just a runtime for your SQL code. It’s just doing what you ask it to do, nothing more, nothing less. This applies to any database. MySQL, PostgreSQL, maybe even Oracle are all just agents that do your bidding. Typically what happens is something like this: You develop an application.You test it. Then, maybe a few weeks, maybe a few years later, you, or your successor, notices that the application or website’s response is slow, and it turns out, it’s the database’s fault. The problem with this scenario is that the database probably isn’t the problem. First off, how was the conclusion reached that the database is slow? Both Windows and SQL Server give you some excellent tools for diagnosing your problem. First, look at the CPU usage of the SQL Server process. Examining SQL Server Trace Files.
By Bill Graziano on 15 May 2006 | 2 Comments | Tags: Performance Monitors, Profiler & Trace sqlec writes "I am attempting to analyze a stored procedure that I have written and have a question regarding profiler, What exactly are reads?
And what is the correlation between cpu, reads and duration? Is that correlation direct? " It's been a while since I answered any of the posted questions. I spend a lot of my time reading through trace files. Events I typically start by tracing the SQL:BatchCompleted event and the RPC:CompletedEvent event. Data Columns I normally capture the following data columns for the two events above: EventClass. Those events should give you a good start identifying slow queries or queries that use a lot of resources. sp_reset_connection If you're using connection pooling you'll see lots and lots of calls to sp_reset_connection. Cursors You may see a pattern like this: The three sections above will be three different events.
Troubleshooting Performance Problems in SQL Server 2005. Published: October 1, 2005 Writers: Sunil Agarwal, Boris Baryshnikov, Tom Davidson, Keith Elmore, Denzil Ribeiro, Juergen Thomas Applies To: SQL Server 2005 Summary: It is not uncommon to experience the occasional slow down of a SQL Server database.
A poorly designed database or a system that is improperly configured for the workload are but several of many possible causes of this type of performance problem. Administrators need to proactively prevent or minimize problems and, when they occur, diagnose the cause and take corrective actions to fix the problem. On This Page Introduction Goals Methodology Resource Bottlenecks CPU Bottlenecks Memory Bottlenecks I/O Bottlenecks Tempdb Slow-Running Queries Conclusion Appendix A: DBCC MEMORYSTATUS Description Appendix B: Blocking Scripts Introduction Many customers can experience an occasional slow down of their SQL Server database. Goals. Identifying performance issues using SQL Server Profiler. NEW!!!
Subscribe to my newsletter: How to identify SQL Server performance issues, by analyzing Profiler output? (See also: Automating server side tracing in SQL Server) It is always better to be proactive than reactive, when it comes to identifying and eliminating SQL Server performance issues. In this article, I am going to explain the method I follow, to identify performance issues in my database applications, before those applications go into production environment. Once the application is completely built and tested, I will conduct something called a "Load test" or "Stress test".
In this article, I will explain how to use Profiler to identify SQL Server specific performance issues. Idea here, is to run Profiler during the load test, and analyze the Profiler output at the end of the load test, to identify the longest running queries, most CPU intensive queries, stored procedure recompilations, errors like deadlocks etc. Click here to download the trace definition file LoadTest.tdf Top. SQL Server: Optimizing SQL Server CPU Performance. SQL Server Native Client: Connection strings and OLE DB - Microsoft SQLNCli team blog. (Anton Klimov, a developer on the SQL Server Native Client team, wrote the following article.)
Connection strings for an OLE DB provider is a concept that causes a lot of confusion. One problem is that OLE DB itself does not define connection string as a provider concept. The documentation at Connection String Syntax ( says: "A connection string is a string version of the initialization properties needed to connect to a data store and enables you to easily store connection information within your application or to pass it between applications. Without a connection string, you would be required to store or pass a complex array of structures to access data. “when accessing OLE DB directly” actually means that the application doesn’t directly instantiate a corresponding provider object, but rather goes through the “service component”, (otherwise known as “core services”, layer (oledb32.dll) by doing something like: Moving a Database from SQL Server 2005 to SQL Server 2008 in Three Steps.
Exclusive offer: get 50% off this eBook here Beginners Guide to SQL Server Integration Services Using Visual Studio 2005 — Save 50% An ideal book and eBook for trainers who want to teach an introductory course in SQL Server Integration Services or, to those who want to study and learn SSIS in a little over two weeks. by Jayaram Krishnaswamy | February 2008 | .NET Microsoft.
CAST and CONVERT. Explicitly converts an expression of one data type to another.
CAST and CONVERT provide similar functionality. Syntax. Journey to SQL Authority with Pinal Dave. Configuring SQL Server memory settings. Denny Cherry, Contributor As with other applications, SQL Server applications need memory to run.
However, unlike most applications, SQL Server allows you to decide just how much memory it can use. That's good because SQL Server likes lots of memory. Server memory options are set either within the GUI or with the sp_configure procedure by adjusting the "max server memory (MB)" setting. Setting server memory properties. Unlike most applications, you can configure SQL Server to use more than 2 GB of RAM by enabling the AWE (Address Windowing Extensions) memory setting, either on the same memory screen or via the sp_configure procedure by adjusting the "AWE enabled" setting.
TechTarget Network Benefits Unrestricted access to 200,000+ original tips, analysis, news and guides created by industry experts. Connect with TechTarget experts and find answers to your technology questions. Protecting Privacy TechTarget is committed to protecting our users' privacy. Privacy Policy Premium Access. Ntext vs text data types.