Microsoft Azure Essentials Fundamentals of Azure Second Edition e-optimized 5x11 pdf



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9781509302963 Microsoft Azure Essentials Fundamentals of Azure 2nd ed pdf

Service tier 
Performance level  Maximum database size  DTUs 
Target usage scenario 
Basic 
  
2 GB 

Small databases with 
minimal concurrent 
operations. Typically 
development or test 
usage scenarios. 
Standard 
S0 
250 GB 
10 
Cloud applications with 
multiple concurrent 
transactions. 
S1 
20 
S2 
50 
S3 
100 
Premium 
P1 
500 GB 
125 
Mission-critical, 
enterprise-grade 
applications with high 
transaction rates and 
advanced business 
continuity features. 
P2 
250 
P4 
500 
P6 
1,000 
P11 
1 TB 
1,750 
 
Note  Web and Business editions for SQL Database were retired in September 2015. For more 
information, please reference 
https://azure.microsoft.com/documentation/articles/sql-database-
web-business-sunset-faq/
.  
Determining which service tier to use often depends on monitoring your application performance and 
then adjusting SQL Database tiers. You can start with a Basic tier, and based on performance 
indicators, scale up to a Standard or Premium tier if needed. Integrated tools such as Database 
Advisor (formerly known as Index Advisor), Query Performance Insight, and Query Store can help you 
gain a better understanding of how to best tune either the application or the database. Adjusting 


159 
CHAPTER 6  |    Databases 
 
service tiers and performance levels is an online operation, so you can continue to use the database 
while the operation completes. When doing so, some database connections might be dropped. Be 
sure to include retry logic in your application to be resilient to such transient errors. 
If you are migrating an existing on-premises Microsoft SQL Server database, you can use a third-party 
tool, the SQL Database DTU Calculator (available at 
http://dtucalculator.azurewebsites.net/
) to 
estimate the performance level and service tier needed for a SQL Database instance. The tool works 
for both single and elastic databases, providing recommendations and DTU requirements. 
See Also  For more information on SQL Database tiers and performance levels, including DTUs 
and monitoring database performance, please visit 
https://azure.microsoft.com/documentation/articles/sql-database-service-tiers/
.  
 

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