How to troubleshoot SQL Server performance issues. To troubleshoot performance issues, you must complete a series of steps to isolate and determine the cause of the problem.
Possible causes include: BlockingSystem resource contentionApplication design problemsQueries or stored procedures that have long execution times Identifying these causes is typically very time consuming, and you may spend several days evaluating the collected information. The complexity of the performance analysis is not specific to a particular database product or operating system. All applications are subject to performance constraints because of resource, design, or usage factors. For more information, click the following article number to view the article in the Microsoft Knowledge Base: ( ) A Performance Troubleshooting Methodology for SQL Server. When healing a sick SQL Server, you must forget the idea that there could ever be a simple correspondence between symptom and disease: The art of troubleshooting is much more the art of discovering, and assembling, the various pieces of the puzzle so that you have a complete understanding of what is going on inside of a server Knowing where to start is the toughest part of solving a problem.
As a Senior Database Administrator, I prided myself on being able to pinpoint the root cause of problems in my servers, and quickly restore services to normal working order. The ability to do this is partly down to a sound knowledge of your SQL Server environment, partly to having the right tools and scripts, and partly to what you learn to look out for, based on hard-earned lessons of the past. I see, yet I cannot see the wood for the trees. Jonathan Kehayias - The Rambling DBA. Last week someone sent Kimberly an email asking what the read_microsec column in the sys.dm_os_buffer_descriptors DMV in SQL Server 2012 showed.
The email was passed around our team and to be honest it was the first time I’d even heard of the column existing. The questioner also wanted to know if/how the read_microsec column be used. The Books Online topic for sys.dm_os_buffer_descriptors defines this column as, “The actual time (in microseconds) required to read the page into the buffer. This number is reset when the buffer is reused.” This would make you think that the counter is per-page in the buffer pool, but I wanted to see what exactly it correlates to, and the results aren’t quite as straightforward as the Books Online description might seem.
Investigating this further. Simplify Process Troubleshooting with DebugDiag. When troubleshooting application-stability concerns and performance problems such as crashes, hangs, and high memory usage, sometimes you need to examine the process that was active when the problem occurred.
To complicate troubleshooting, server applications such as Microsoft IIS, Exchange Server, SQL Server, COM+, and BizTalk Server often display no UI and restart automatically without indicating what caused them to fail. Having the right debugging tool to isolate a problem can make finding the solution much easier. For such problems, Debug Diagnostic Tool (DebugDiag) is often a better choice than other debugging tools such as ADPlus, Userdump, and WinDbg. I’ll explain why and will walk you through using Debug- Diag to troubleshoot a process crash. Why Use DebugDiag? Performance Troubleshooting using the PAL tool - Mike Lagase. If you have had Exchange performance issues in the past, you must know by now that there are a lot of variables that affect Exchange overall performance and sometimes took a long time to find root cause of those problems as they can get quite complex.
If you are looking for some more detailed reports with some added charting capabilities, there is the Performance Analyzer Tool or PAL that you can grab from . PAL is an extremely useful and powerful tool for automatically generating HTML reports that were collected from a performance monitor counter log. This tool uses a subset of dependencies such as Log Parser and the Office Web Components to create these reports. Httping. Capturar volcados con DebugDiag usando contadores de rendimiento - Desarrollo Web. Vamos a utilizar el Debug Diagnostic Tool (DebugDiag) para configurar reglas que se activen cuando se cumplan unos requisitos relacionados con los contadores de rendimiento.
En concreto voy a poner de ejemplo cómo configurarlos para un consumo alto de CPU. Lo que vamos a hacer es crear una regla que se active cuando el consumo del procesador sea superior al 80% durante 5 segundos y capture 3 volcados de memoria cada 30 segundos. Ahora viene la pregunta ¿por qué tenemos que capturar 3 volcados y por qué cada 30 segundos?.
La respuesta es sencilla, un solo volcado puede darnos una información sesgada porque sólo veríamos unos hilos en ejecución pero no sabríamos cuánto tiempo habrían estado ejecutándose, si están parados, o si hemos cogido por casualidad al Garbage Collector funcionando… Los 30 segundos entre volcados nos indican cómo es la evolución de la aplicación en el tiempo. Estas son las instrucciones: Capturar volcados con DebugDiag usando contadores de rendimiento - Desarrollo Web. Performance Analysis of Logs (PAL) Tool - Home. Get a Handle on Windows Performance Analysis. As an administrator, you probably know firsthand that manually analyzing Performance Monitor logs is a time-consuming process, requiring both a deep-level knowledge of performance counters and familiarity with Windows architecture.
The Microsoft Global Escalation Services team gets thousands of calls from customers requesting help in analyzing Performance Monitor logs either to help solve an existing problem or determine whether their servers are optimized for the best possible performance. Performance Analysis of Logs (PAL) Tool - Home. How to troubleshoot SQL Server performance issues.
Top 10 SQL Server Counters for Monitoring SQL Server Performance.