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Troubleshooting Azure SQL server

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Troubleshooting Azure SQL server

Postby blin » Tue Feb 13, 2018 6:25 pm

Here are some collections of troubleshooting SQL running in Azure.

Simplify performance tuning and troubleshooting with Azure SQL ...

May 16, 2016 ... Learn how SQL Database helps you improve the performance of your databases by providing intelligent tuning actions and recommendations based on historical database usage. Improve your database performance using SQL Database Advisor and Performance Dashboard.
https://azure.microsoft.com/en-us/blog/ ... -database/


Troubleshoot Azure SQL Database performance issues with ...

Sep 25, 2017 ... This page provides information on Azure SQL Database performance issues that are detected through the Intelligent Insights database performance diagnostics log. This diagnostics log can be sent to Azure Log Analytics, Azure Event Hubs, Azure Storage, or a third-party solution for custom DevOps ...
https://docs.microsoft.com/en-us/azure/ ... erformance


Getting Started Tuning Performance in Azure SQL Database

Mar 29, 2016 ... Tim Radney (@tradney) of SQLskills talks about the initial differences he has encountered while mastering the art of performance tuning Azure SQL Database. ... with Azure SQL Database. I use the file-stats-over-a-period-of-time regularly when troubleshooting performance issues. The cumulative data has ...
https://sqlperformance.com/2016/03/sql- ... l-database


Azure SQL Database performance tuning guidance | Microsoft Docs

Feb 9, 2017 ... Applications that have inherent data access concurrency issues, for example deadlocking, might not benefit from a higher performance level. Consider reducing round trips against the Azure SQL Database by caching data on the client side with the Azure Caching service or another caching technology.
https://docs.microsoft.com/en-us/azure/ ... e-guidance


5 steps to optimize Azure SQL performance | Blue Medora

Apr 18, 2017 ... Experiencing issues with your Azure SQL workloads? Check out these five tips to optimize Azure SQL performance across your environment.
https://bluemedora.com/optimize-azure-sql-performance/


Monitoring & performance tuning - Azure SQL Database | Microsoft ...

Azure SQL Database enables you to easily monitor your database usage and identify queries that might cause the performance issues. You can monitor database performance using Azure portal or system views. You have the following options ...
https://docs.microsoft.com/en-us/azure/ ... erformance

Performance Tips and Troubleshooting in Microsoft Azure ...

Sep 14, 2016 ... Performance Best Practises for MS SQL Server in Microsoft Azure Virtual Machines: https://msdn.microsoft.com/en-us/librar ... 3149.aspx; Most important points to consider: Avoid using operating system or temporary disks for database storage or logging; Avoid using Azure data disk caching ...
https://wiki.scn.sap.com/wiki/display/V ... soft+Azure


Query performance insights for Azure SQL Database | Microsoft Docs

Jul 5, 2017 ... From left-hand side menu, under support and troubleshooting, select “Query Performance Insight”. On the first tab, review the list of top resource-consuming queries. Select an individual query to view its details. Open SQL Azure Database Advisor and check if any recommendations are available.
https://docs.microsoft.com/en-us/azure/ ... erformance


Troubleshoot and Optimize Queries with Azure SQL Database ...

SQL Database is a cloud based relational database with SQL Server 2008 engine at its core. Dynamic Management Views (DMVs) were introduced with SQL Server 2005 and since then, have become a very powerful tool for troubleshooting issues at all levels of performance, ...
https://www.google.com/url?q=https://so ... oioM9d81uS


Why you should think twice about Windows Azure SQL Database

Find out from SQL Server expert Serdar Yegulalp why the Windows Azure SQL Database might not be such a great fit for your IT shop after all. ... Other issues to keep in mind include lack of support for transparent data encryption, change data capture, FILESTREAM data, integrated full-text search or SQL Server replication, ...
https://www.google.com/url?q=http://sea ... cmFAEzRlJB
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Re: Troubleshooting Azure SQL server

Postby chicagotech » Fri Feb 16, 2018 3:33 pm

Troubleshoot Azure SQL Database performance issues with ...

This detectable performance pattern indicates a condition in which the client using the SQL database can't consume the output from the database as fast as the database sends the results. Because SQL Database isn't storing results of the executed queries in a buffer, it slows down and waits for ...
https://docs.microsoft.com/.../azure/sq ... telligent- insights-troubleshoot-performance

Improving the Quality of SQL Server Database Connections in the ...

Sep 22, 2014 ... Good old TDS is still used to connect to Sql Azure over the internet, but TDS is now in a very different world to the one it was designed for. This can cause problems. Connections can be slow to create, they can be insecure, and they can break. To explain more about these problems, and how to avoid them ...
https://www.red-gate.com/.../sql/...sql ... ql-server- database-connections-in-the-cloud/
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Re: Troubleshooting Azure SQL server

Postby chicagotech » Fri Feb 16, 2018 4:10 pm

There are a number of common reasons for slow-running queries and updates:
Slow network communication.
Inadequate memory in the server computer, or not enough memory available for SQL Server.
Lack of useful statistics
Lack of useful indexes.
Lack of useful indexed views.
Lack of useful data striping.
Lack of useful partitioning.

To find out what’s happening with your SQL Server, start with monitoring databases, watch the performance metrics over time to create baselines and trend lines for normal operation, isolate the processes that use a lot of resources. Then you will be able to debug and repair the issues
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Re: Troubleshooting Azure SQL server

Postby chicagotech » Fri Feb 16, 2018 4:13 pm

Common causes of performance issues
The causes for performance problems can be various, but the most common are a poorly designed database, incorrectly configured system, insufficient disk space or other system resources, excessive query compilation and recompilation, bad execution plans due to missing or outdated statistics, and queries or stored procedures that have long execution times due to improper design
Memory bottlenecks are caused by limitations in available memory and memory pressure caused by SQL Server, system, or other application activity. Poor indexing requires table scans which in case of large tables means that a large number of rows is read from disk and handled in memory
Network bottlenecks are caused by overload on a server or network, so the data cannot flow as expected
I/O issues can be caused by slow hardware used, bad storage solution design, and configuration. Besides hardware components, such as disk types, disk array type, and RAID configuration that affect I/O performance, unnecessary requests made by a database also affect I/O traffic. Frequent index scans, inefficient queries, and out of date statistics can also cause I/O workload and bottlenecks
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Re: Troubleshooting Azure SQL server

Postby chicagotech » Fri Feb 16, 2018 4:16 pm

Using SQL Profiler
Although collecting diagnostic data using SQL Profiler is known to add some overhead to your workflow it should still give you a broad picture of the processing times. You can minimize this overhead by running a server-side trace, and then exporting the data as described below. Alternatively, if you’re confident with Extended Events and XQuery, you should be able to get similar data via that route.
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