Achieving Zero Downtime for SQL

3. ©2017 ScaleArc. All Rights Reserved. 3 Two Sources of Downtime • Unplanned Outages – A strong failover architecture is imperative – Instantly identify and automatically reroute traffic away from a failed database server, even across data centers – Avoid application errors and user dissatisfaction • Planned Maintenance – Carefully examine your database maintenance strategy • Are you bringing servers completely offline for maintenance? • Are you disabling applications associated with those databases during maintenance?

4. ©2017 ScaleArc. All Rights Reserved. 4 Want Guaranteed Downtime? Keep your applications directly connected to your databases This 1:1 tie will guarantee that any database hiccup will make your application throw up Or…

5. ©2017 ScaleArc. All Rights Reserved. 5 Leverage the Fact that Databases are Getting Smarter Modern databases offer: • Scale out • Better replication • Automatic failover But make one key change: End the 1:1 tie between apps and databases by inserting an abstraction layer.

6. ©2017 ScaleArc. All Rights Reserved. 6 An Abstraction Layer is Critical for Zero Downtime • Database Load Balancing Software acts as a buffer PrimaryPrimary SecondaryPrimary replication Secondary • Leverages database replication and failover • Makes failover invisible to the app by queing writes until the new primary is ready • Enables servers to go offline for maintenance without taking down the app Database Load Balancing Software

7. ©2017 ScaleArc. All Rights Reserved. 7 ScaleArc’s Database Load Balancing Software • Intelligently directs traffic into the database on behalf of the app • Deploys transparently, with no changes to app or database • Leverages and augments database’s replication and failover

11. ©2017 ScaleArc. All Rights Reserved. 11 Primary Secondary replication Avoid Downtime during Unplanned Outages Secondary 1 ScaleArc performs read/write split R WR W R R W 2 Upon database failure, ScaleArc queues writes W W

12. ©2017 ScaleArc. All Rights Reserved. 12 Primary Secondary replication Avoid Downtime during Unplanned Outages Secondary 1 ScaleArc performs read/write split R WR W R R 2 Upon database failure, ScaleArc queues writes 3 After secondary is promoted, ScaleArc directs queries to new primary server Primary W W W

13. ©2017 ScaleArc. All Rights Reserved. 13 Primary Secondary replication Avoid Downtime during Unplanned Outages Secondary 1 ScaleArc performs read/write split R WR W R R 2 Upon database failure, ScaleArc queues writes 3 After secondary is promoted, ScaleArc directs queries to new primary server Primary W W W 4 Apps see delay, but do not restart

16. ©2017 ScaleArc. All Rights Reserved. 16 Secondary replication Enable Zero Downtime Maintenance Secondary 1 Mark a database to be taken offline Primary WRRWR R W W R 2 ScaleArc automatically reroutes queries away from offline server

17. ©2017 ScaleArc. All Rights Reserved. 17 Secondary replication Enable Zero Downtime Maintenance Secondary 1 Mark a database to be taken offline Primary WRRWR R W W R 2 ScaleArc automatically reroutes queries away from offline server 3 Patch the server and bring it back online

18. ©2017 ScaleArc. All Rights Reserved. 18 SecondarySecondary replication Enable Zero Downtime Maintenance SecondaryPrimary WRRWR R W W R R 4 After health check, ScaleArc auto restores traffic to updated server 3 Patch the server and bring it back online 2 ScaleArc automatically reroutes queries away from offline server 1 Mark a database to be taken offline

Editor's Notes

Whether unplanned or planned, downtime disrupts business continuity. The cost of downtime comes in many forms, including:  Poor user experience  Decreased productivity  Wasted time and IT resources  Lost revenue With an increasing number of servers requiring ever longer maintenance windows, planned updates, such as patching software, can take hours. For software-as-a-service (SaaS) providers and businesses delivering online services, unplanned downtime brings even higher costs through broken service level agreements (SLAs) and lost revenue. In some cases, payments for SLA violations caused by system downtime can skyrocket to millions of dollars. For ecommerce companies, system downtime results not only in lost revenue but also in lost consumer confidence. Downtime often occurs at business peaks, coming just when companies anticipate the highest revenue – such as Black Friday or Cyber Monday – when heavier loads strain systems. At these times, every second of downtime means lost orders, as customers quickly abandon down or slow sites to shop elsewhere.
For unplanned downtime, businesses need a strong failover architecture that can be easily deployed and implemented. This architecture must be able to instantly identify and automatically reroute traffic away from a failed database server – even across data centers. Without this capability, database uptime takes a hit – resulting not only in application errors but also decreased user satisfaction. For planned downtime, businesses need to reevaluate how they implement planned database maintenance. Existing approaches actually create more downtime because most organizations bring servers completely offline for maintenance, which also takes down the applications the database supports.
For unplanned downtime, businesses need a strong failover architecture that can be easily deployed and implemented. This architecture must be able to instantly identify and automatically reroute traffic away from a failed database server – even across data centers. Without this capability, database uptime takes a hit – resulting not only in application errors but also decreased user satisfaction. For planned downtime, businesses need to reevaluate how they implement planned database maintenance. Existing approaches actually create more downtime because most organizations bring servers completely offline for maintenance, which also takes down the applications the database supports.
ScaleArc – Unique Traffic Management With applications connected directly to a database server, the minute a connection is dropped, the application gets errors. ScaleArc changes that scenario by delivering an abstraction layer for the database tier that optimizes traffic flows and provides a seamless and highly reliable method to ensure availability. Creating an abstraction layer between the client-side and the server-side connections, ScaleArc uniquely shields an application from failure, regardless of what’s happening in the background. Even if a database server dies, ScaleArc will automatically and intelligently route traffic to where it needs to go. In the case of unplanned or planned downtime, ScaleArc’s ability to handle client transactions and route queries to appropriate server connections offers tremendous value. By separating the direct relationship between clients and server connections, ScaleArc can instantly and automatically redirect traffic flows as needed and ensure appropriate load distribution.
ScaleArc allows you to do zero downtime maintenance with no app interruption. Let’s say you have to bring the secondary server down to do a patch for that server. Mark that database server offline in ScaleArc. ScaleArc gracefully bleeds that server of all connections and all workloads going to that server at that point in time. And now all the workload is sent to the primary database server. You can now patch the server or do a database upgrade of the secondary server. Once completed, you can bring the patched server back online. After you do a health check to ensure that the patched server is ready and is capable of accepting workloads, ScaleArc automatically restores traffic to the updated/patched server. This allows you to provide zero downtime maintenance to each and every application in your environment. There’s no additional framework necessary to take advantage of zero downtime maintenance. Additionally, zero downtime maintenance with ScaleArc works for all databases and database versions: MySQL, SQL Server, and Oracle. You do not need Oracle RAC to take advantage of this capability. We can work with Oracle DataGuard and Oracle Golden Gate to perform zero downtime maintenance.
ScaleArc allows you to do zero downtime maintenance with no app interruption. Let’s say you have to bring the secondary server down to do a patch for that server. Mark that database server offline in ScaleArc. ScaleArc gracefully bleeds that server of all connections and all workloads going to that server at that point in time. And now all the workload is sent to the primary database server. You can now patch the server or do a database upgrade of the secondary server. Once completed, you can bring the patched server back online. After you do a health check to ensure that the patched server is ready and is capable of accepting workloads, ScaleArc automatically restores traffic to the updated/patched server. This allows you to provide zero downtime maintenance to each and every application in your environment. There’s no additional framework necessary to take advantage of zero downtime maintenance. Additionally, zero downtime maintenance with ScaleArc works for all databases and database versions: MySQL, SQL Server, and Oracle. You do not need Oracle RAC to take advantage of this capability. We can work with Oracle DataGuard and Oracle Golden Gate to perform zero downtime maintenance.
ScaleArc allows you to do zero downtime maintenance with no app interruption. Let’s say you have to bring the secondary server down to do a patch for that server. Mark that database server offline in ScaleArc. ScaleArc gracefully bleeds that server of all connections and all workloads going to that server at that point in time. And now all the workload is sent to the primary database server. You can now patch the server or do a database upgrade of the secondary server. Once completed, you can bring the patched server back online. After you do a health check to ensure that the patched server is ready and is capable of accepting workloads, ScaleArc automatically restores traffic to the updated/patched server. This allows you to provide zero downtime maintenance to each and every application in your environment. There’s no additional framework necessary to take advantage of zero downtime maintenance. Additionally, zero downtime maintenance with ScaleArc works for all databases and database versions: MySQL, SQL Server, and Oracle. You do not need Oracle RAC to take advantage of this capability. We can work with Oracle DataGuard and Oracle Golden Gate to perform zero downtime maintenance.
ScaleArc allows you to do zero downtime maintenance with no app interruption. Let’s say you have to bring the secondary server down to do a patch for that server. Mark that database server offline in ScaleArc. ScaleArc gracefully bleeds that server of all connections and all workloads going to that server at that point in time. And now all the workload is sent to the primary database server. You can now patch the server or do a database upgrade of the secondary server. Once completed, you can bring the patched server back online. After you do a health check to ensure that the patched server is ready and is capable of accepting workloads, ScaleArc automatically restores traffic to the updated/patched server. This allows you to provide zero downtime maintenance to each and every application in your environment. There’s no additional framework necessary to take advantage of zero downtime maintenance. Additionally, zero downtime maintenance with ScaleArc works for all databases and database versions: MySQL, SQL Server, and Oracle. You do not need Oracle RAC to take advantage of this capability. We can work with Oracle DataGuard and Oracle Golden Gate to perform zero downtime maintenance.
ScaleArc allows you to do zero downtime maintenance with no app interruption. Let’s say you have to bring the secondary server down to do a patch for that server. Mark that database server offline in ScaleArc. ScaleArc gracefully bleeds that server of all connections and all workloads going to that server at that point in time. And now all the workload is sent to the primary database server. You can now patch the server or do a database upgrade of the secondary server. Once completed, you can bring the patched server back online. After you do a health check to ensure that the patched server is ready and is capable of accepting workloads, ScaleArc automatically restores traffic to the updated/patched server. This allows you to provide zero downtime maintenance to each and every application in your environment. There’s no additional framework necessary to take advantage of zero downtime maintenance. Additionally, zero downtime maintenance with ScaleArc works for all databases and database versions: MySQL, SQL Server, and Oracle. You do not need Oracle RAC to take advantage of this capability. We can work with Oracle DataGuard and Oracle Golden Gate to perform zero downtime maintenance.
ScaleArc allows you to do zero downtime maintenance with no app interruption. Let’s say you have to bring the secondary server down to do a patch for that server. Mark that database server offline in ScaleArc. ScaleArc gracefully bleeds that server of all connections and all workloads going to that server at that point in time. And now all the workload is sent to the primary database server. You can now patch the server or do a database upgrade of the secondary server. Once completed, you can bring the patched server back online. After you do a health check to ensure that the patched server is ready and is capable of accepting workloads, ScaleArc automatically restores traffic to the updated/patched server. This allows you to provide zero downtime maintenance to each and every application in your environment. There’s no additional framework necessary to take advantage of zero downtime maintenance. Additionally, zero downtime maintenance with ScaleArc works for all databases and database versions: MySQL, SQL Server, and Oracle. You do not need Oracle RAC to take advantage of this capability. We can work with Oracle DataGuard and Oracle Golden Gate to perform zero downtime maintenance.
ScaleArc allows you to do zero downtime maintenance with no app interruption. Let’s say you have to bring the secondary server down to do a patch for that server. Mark that database server offline in ScaleArc. ScaleArc gracefully bleeds that server of all connections and all workloads going to that server at that point in time. And now all the workload is sent to the primary database server. You can now patch the server or do a database upgrade of the secondary server. Once completed, you can bring the patched server back online. After you do a health check to ensure that the patched server is ready and is capable of accepting workloads, ScaleArc automatically restores traffic to the updated/patched server. This allows you to provide zero downtime maintenance to each and every application in your environment. There’s no additional framework necessary to take advantage of zero downtime maintenance. Additionally, zero downtime maintenance with ScaleArc works for all databases and database versions: MySQL, SQL Server, and Oracle. You do not need Oracle RAC to take advantage of this capability. We can work with Oracle DataGuard and Oracle Golden Gate to perform zero downtime maintenance.
ScaleArc allows you to do zero downtime maintenance with no app interruption. Let’s say you have to bring the secondary server down to do a patch for that server. Mark that database server offline in ScaleArc. ScaleArc gracefully bleeds that server of all connections and all workloads going to that server at that point in time. And now all the workload is sent to the primary database server. You can now patch the server or do a database upgrade of the secondary server. Once completed, you can bring the patched server back online. After you do a health check to ensure that the patched server is ready and is capable of accepting workloads, ScaleArc automatically restores traffic to the updated/patched server. This allows you to provide zero downtime maintenance to each and every application in your environment. There’s no additional framework necessary to take advantage of zero downtime maintenance. Additionally, zero downtime maintenance with ScaleArc works for all databases and database versions: MySQL, SQL Server, and Oracle. You do not need Oracle RAC to take advantage of this capability. We can work with Oracle DataGuard and Oracle Golden Gate to perform zero downtime maintenance.
ScaleArc allows you to do zero downtime maintenance with no app interruption. Let’s say you have to bring the secondary server down to do a patch for that server. Mark that database server offline in ScaleArc. ScaleArc gracefully bleeds that server of all connections and all workloads going to that server at that point in time. And now all the workload is sent to the primary database server. You can now patch the server or do a database upgrade of the secondary server. Once completed, you can bring the patched server back online. After you do a health check to ensure that the patched server is ready and is capable of accepting workloads, ScaleArc automatically restores traffic to the updated/patched server. This allows you to provide zero downtime maintenance to each and every application in your environment. There’s no additional framework necessary to take advantage of zero downtime maintenance. Additionally, zero downtime maintenance with ScaleArc works for all databases and database versions: MySQL, SQL Server, and Oracle. You do not need Oracle RAC to take advantage of this capability. We can work with Oracle DataGuard and Oracle Golden Gate to perform zero downtime maintenance.
ScaleArc allows you to do zero downtime maintenance with no app interruption. Let’s say you have to bring the secondary server down to do a patch for that server. Mark that database server offline in ScaleArc. ScaleArc gracefully bleeds that server of all connections and all workloads going to that server at that point in time. And now all the workload is sent to the primary database server. You can now patch the server or do a database upgrade of the secondary server. Once completed, you can bring the patched server back online. After you do a health check to ensure that the patched server is ready and is capable of accepting workloads, ScaleArc automatically restores traffic to the updated/patched server. This allows you to provide zero downtime maintenance to each and every application in your environment. There’s no additional framework necessary to take advantage of zero downtime maintenance. Additionally, zero downtime maintenance with ScaleArc works for all databases and database versions: MySQL, SQL Server, and Oracle. You do not need Oracle RAC to take advantage of this capability. We can work with Oracle DataGuard and Oracle Golden Gate to perform zero downtime maintenance.
ScaleArc allows you to do zero downtime maintenance with no app interruption. Let’s say you have to bring the secondary server down to do a patch for that server. Mark that database server offline in ScaleArc. ScaleArc gracefully bleeds that server of all connections and all workloads going to that server at that point in time. And now all the workload is sent to the primary database server. You can now patch the server or do a database upgrade of the secondary server. Once completed, you can bring the patched server back online. After you do a health check to ensure that the patched server is ready and is capable of accepting workloads, ScaleArc automatically restores traffic to the updated/patched server. This allows you to provide zero downtime maintenance to each and every application in your environment. There’s no additional framework necessary to take advantage of zero downtime maintenance. Additionally, zero downtime maintenance with ScaleArc works for all databases and database versions: MySQL, SQL Server, and Oracle. You do not need Oracle RAC to take advantage of this capability. We can work with Oracle DataGuard and Oracle Golden Gate to perform zero downtime maintenance.
ScaleArc Keeps Business Data Flowing Database downtime can account for hours, even days, of lost productivity, impacting business profitability, as well as user confidence. By minimizing downtime from unexpected failure or planned maintenance, ScaleArc helps organizations keep their critical data flowing. Businesses realize more value maintaining productivity, ensuring user satisfaction, and maximizing revenue potential.

Achieving Zero Downtime for SQL

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