What are the high availability options in SQL Server?
These are some of the supported SQL Server High Availability Strategies.
- Windows Failover Cluster Instance (within single datacenter)- Till SQL Server 2008 R2.
- Transactional Replication.
- Log Shipping (within or nearby data center with fast data transfer options)
- Database Mirroring (Synchronous)
How do you check if high availability is enabled in SQL Server?
In SQL Server Configuration Manager, click SQL Server Services, right-click SQL Server (), where is the name of a local server instance for which you want to enable Always On Availability Groups, and click Properties. Select the Always On High Availability tab.
What is difference between HA and DR in SQL Server?
SQL Server high availability (HA) is about providing service availability and 100% uptime through redundant and fault-tolerant components at the same location. Disaster Recovery (DR) is about providing service continuity and minimizing downtime through redundant & independent site in a distinct location.
What is quorum in SQL?
The Microsoft SQL Server TechNet glossary defines quorum as: “in a database mirroring session with a witness server, a relationship in which the servers that can currently communicate with each other arbitrate who owns the role of principal server.” The witness server as a third party is required to create a quorum.
How do I set SQL to high availability?
Configure SQL Server Right click on SQL Server Services and open the Properties dialog box. Navigate to the AlwaysOn High Availability tab and select the Enable AlwaysOn Availability Groups checkbox. Restart the SQL Server Service after making these changes. Complete these steps on all your replicas.
What is RTO and RPO in SQL Server?
Recovery Point Objective (RPO) and Recovery Time Objective (RTO) are two of the most important parameters of a disaster recovery or data protection plan. These are objectives that can guide enterprises to choose an optimal cloud backup and disaster recovery plan.
How do I add a database to a high availability group?
Right-click the availability group, and select one of the following commands:
- To launch the Add Database to Availability Group Wizard, select the Add Database command.
- To add one or more databases by specifying them in the Availability Group Properties dialog box, select the Properties command.
What is split brain in SQL Server?
Split brain is a state of a server cluster where nodes diverge from each other and have conflicts when handling incoming I/O operations. The servers may record the same data inconsistently or compete for resources.
What is RTO and ROP?
Why is RTO and RPO important?
RTO (Recovery Time Objective) and RPO (Recovery Point Objective) are key factors in determining database backup and disaster recovery scenarios. People think of them as technical terms, and there is nothing wrong with that. However, it is important to think of them in a business sense as well.