Database workloads clustering has been typically associated with SQL AlwaysOn Availability Groups for almost seven years, though the license is still quite expensive. At the moment once can build Microsoft SQL Server cluster with the Standard license and AlwaysOn Failover Cluster Instances, getting database high availability at lower expense.
Check what the difference is between the Standard and Enterprise editions of SQL AlwaysOn Availability Groups:
- SQL Server Enterprise license is not required
- Configuration complexity is reduced
- Physical shared storage is not required
Check out the SQL clustering practices and find out how to reduce the expenses with MS SQL Server: