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Tech-Spark: SQL Server 2016 High Availability
- 2. Ralph: Who amI? • An Enterprise Architect • at an iGaming Industry • focus on Data Platforms • A Microsoft Certified Trainer • deliver MTA, MCSA, MCSE locally • covering Windows, SQL Server, C# • I’m here for a full-blown hands-on demonstration on possible high availability deployment setups using SQL Server 2016
- 3. Log Shipping Transaction LogShipping • TLS is a backup & restore configuration • is mature, reliable, widely adopted technology • requires a full database recovery model • can be restored with norestore or standby • Does not offer automation for failover scenarios • used to verify backups and maintain lagged db copies • also helps to minimise migrations between clusters • Can be automated via SSMS wizard (sqllogship.exe) • Or performed manually/scripted • Perform backups on primary instance • Copy full & tlog backups to other servers • Restore backups on all the desired servers
- 4. AlwaysOn Failover ClusterInstances • An SQL Server Instance (FCI) is installed across Windows Server Failover Cluster (WSFC) nodes • Protects against server failure by providing a virtual server for client applications to connect to • Requires shared storage, thus a single point of failure which needs to be mitigated • A quorum is required to keep cluster online • Provides automated failover at instance level Failover Cluster Instance Active Windows Cluster Passive
- 5. Availability Group Windows Cluster Primary replica ActiveSecondary replica AlwaysOn Availability Groups • A “shared nothing” approach to high availability on top of Failover Cluster through replication • Replicas can support alternative availability modes • asynchronous – high performance • synchronous – high availability • Provides automated failover at group level • Secondary replicas can provide additional support • read-only access • backup operations
- 6. 2016 Availability GroupsUpgrades • Changes in number of replicas: • Optimised log transport • Load balanced read-only routing • Support Microsoft Distributed Transaction Coordinator (MSDTC) • Basic Availability Groups replaces Database Mirroring (deprecated) • Distributed availability groups • replication between 2 availability groups residing on different Windows Server Failover Clusters. • only manual failovers allowed Version Replicas Synchronous Commit Automatic Failover 2012 4 2 2 2014 8 3 2 2016 8 3 3 ff877884 mt651673
- 7. Events line up •The Global Azure Bootcamp • What: a one day, in-person community driven event focused on developers and IT professionals. • When: April 22nd, 2017. • http://global.azurebootcamp.net/
- 8. Sponsorships • A bigthanks to Microsoft Malta who sponsored today’s event; location, refreshments, parking! • At Tech-Spark, we are constantly looking for sponsors to help in organising events by providing meeting places, refreshments, and topic speakers amongst others. Feel free to contact us should you want to help!
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