This document announces an upcoming webinar on September 24th about configuring applications to take advantage of SQL Server AlwaysOn readable secondary replicas. It provides background on SQL Server high availability and disaster recovery technologies, an overview of AlwaysOn availability groups, and how to configure applications and use active secondary replicas for read scaling and backup operations. The webinar will include a demonstration of implementing an AlwaysOn availability group and testing readable secondaries.

1. Configurando Aplicaciones para Réplicas de
Lectura de SQL-Server AlwaysOn
24 de Septiembre (12 pm GMT -5)
Carlos Rojas
Resúmen:
Cómo configurar SQL-Server y Aplicaciones .NET
para aprovechar la funcionalidad de Lectura de las
Réplicas en AlwaysOn de SQL-Server
Próximos Eventos
Indices columnares en SQL Server
2014
1 de Octubre
José L. Rivera
Power BI para office 365
8 de Octubre
Jorge Castañeda
Introducción a SSIS con BIML
15 de Octubre
Guillermo Caicedo
Está por comenzar:

2. Configurando Aplicaciones para Réplicas de
Lectura de SQL-Server AlwaysOn
24 Setiembre 2014
Carlos Rojas Vargas
MVP | MCSA | MCITP | MCTS | MCPD | MCSE | MCT
Consultor Senior CMA / Trainer CTE
SQL-Server Users Group – Costa Rica
http://sqlugcr.net

3. History of SQL-based Data Redundancy
SQL Backup and Restore (SQL Server 6.5)
SQL Log Shipping (SQL Server 7.0)
SQL Transactional Replication (SQL Server 7.0)
SQL Failover Cluster (SQL Server 7.0)
- HADR Enhancements (SQL Server 2000)
SQL Snapshot (SQL Server 2005)
SQL Mirroring (SQL Server 2005)
- HADR Enhancements (SQL Server 2008 & R2)
SQL AlwaysOn (SQL Server 2012)
SQL AlwaysOn Enhanced (SQL Server 2014)

4. AlwaysOn Technologies in
SQL Server 2012/2014
AlwaysOn Failover Cluster
Instance
• Server-level protection
Windows Server
Failover Cluster
Windows Server
Failover Cluster
AlwaysOn Availability Group
• Database-level protection

5. SQL-Server 2012/2014 HADR
AlwaysOn High Availability Group
(HAG)

7. AlwaysOn: High Availability Group
• Installation
• Windows cluster
• No-clustered SQL
Server

8. A Flexible Solution
AlwaysOn provides the flexibility of different HA
configurations
Synchronous
Data Movement
A
Asynchcronous
Data Movement
A
A
A
Shared Storage, regional and geo secondaries
A
A
A
Direct attached storage local, regional and geo target

9. High Availability Summary
High Availability and Disaster
Recovery
SQL Server Solution
Potential
Data Loss
(RPO)
Potential
Recovery
Time (RTO)
Automatic
Failover
Readable
Secondaries
AlwaysOn Availability Group - synchronous-commit
Zero Seconds Yes(4) Yes
AlwaysOn Availability Group - asynchronous-commit
Seconds Minutes No Yes
AlwaysOn Failover Cluster Instance NA(5) Seconds
-to-minutes
Yes NA
Database Mirroring(2) - High-safety (sync +
witness)
Zero Seconds Yes NA
Database Mirroring(2) - High-performance (async) Seconds(6) Minutes(6) No NA
Log Shipping Minutes(6) Minutes
-to-hours(6)
No Not during
a restore
Backup, Copy, Restore(3) Hours(6) Hours
-to-days(6)
No Not during
a restore

10. Application Failover
Availability Groups Listener allow applications to failover seamlessly to any secondary
Application reconnects using a virtual name after a failover to a secondary
ServerA ServerB ServerC
HR
DB
AG_HR
HR
DB
HR_VNN
Primary Secondary
HR
DB
Primary SSeeccoonnddaarryy
Application retry during failover
-server HR_Listener;-catalog
HRDB
Connect to new primary once
failover is complete
and the listener is online

11. Active Secondary Replicas
Primary Replica
Secondary Replica
(Read-Intent)
Listener
Secondary Replica
(Read-Only)
ApplicationIntent=ReadOnly
Backup

12. AlwaysOnActive Secondary
• IT efficiency and cost-effectiveness is critical for businesses
 Idle hardware is not an option anymore
• AlwaysOnActive Secondary enables efficient utilization of high availability hardware
resources thereby improving overall IT efficiency
• Active Secondary can be utilized for
 Balancing read-only workloads
 Offloading Backup Operations

13. SQLservr.exe SQLservr.exe
InstanceA
DB1 DB2
Readable secondary allow offloading read queries to secondary
Close to real-time data, latency of log synchronization
impact data freshness
Backups in Secondary Replicas
DB1 DB2
Primary Secondary
InstanceB
Secondary Primary
Reports
Backups
Reports
Backups
AlwaysOn Availability Groups

14. Active Secondary
Enabling Backup On Secondary
Backups can be
done on any replica
of a database
Backups on
primary replica still
works
Log backups done
on all replicas form
a single log chain
Database
Recovery Advisor
makes restores
simple
R/W workload
Primary
Backups
Secondary
Backups
Secondary
Backups

15. Read-Only Client Connectivity
Read-Only client connection behavior determined by Availability Replica
Option+ ApplicationIntent Property
ApplicationIntent is a connection property
Replica option determines whether a replica is enabled for read access when in a secondary role
Read-Only Routing enables redirection of client connection to new secondary
on role change
Enable seamless redirection of application connection across replicas without manual intervention

19. Demo
SQL-Server Always On
View Clustering Services 2012R2
Implementing AlwaysOn
High Availability Group (HAG)
Testing Readable Secondaries

20. Manténgase conectado a nosotros!
Visítenos en http://globalspanish.sqlpass.org
20
/SpanishPASSVC
lnkd.in/dtYBzev
/user/SpanishPASSVC
/SpanishPASSVC

21. PASS Community News
September 2014

22. Planning on attending PASS Summit 2014?
• The world’s largest gathering of SQL Server & BI professionals
• Take your SQL Server skills to the next level by learning from the world’s
SQL Server experts, in 190+ technical sessions
• Over 5000 attendees, representing 2000 companies, from 52 countries,
ready to network & learn
Ask your Chapter Leader how to
save $150 off registration!
$1,895
UNTIL SEPTEMBER 26,
2014

23. Join me for a sneak peek of PASS Summit 2014
 24 free SQL Server and BI training webcasts
 Content delivered by PASS Summit speakers & experts from around the
world
 5 Session Tracks, covering Application & Database Development to
Professional Development
 A taste of what you can expect at PASS Summit 2014 in November
www.24HoursofPASS.com

24. Upcoming SQLSaturdays
Upcoming North America Events Upcoming International Events
• Sep 6 #320 Raleigh
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• Sep 20 # 340 San Diego
• Sep 27 #334 Boston (BI Edition)
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Visit www.sqlsaturday.com to
register for an event near you!

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28. Indices columnares en SQL Server 2014
1 de Octubre (12 pm GMT -5)
José L. Rivera
Resúmen:
Los índices columnares, disponibles desde SQL Server
2012, prometen ser una herramienta fundamental para
obtener alto rendimientos en consultas de altos
volúmenes de datos. Estos índices introducen un nuevo
paradigma de construcción y uso el cual estaremos
discutiendo en esta sesión. Veremos sus características
principales y como tomar ventaja de los mismos en
nuestros entornos laborales.
Próximo Evento