Azure SQL Database is highly available database Platform as a Service that guarantees that your database will be up and running 99.99% of time, without worrying about maintenance and downtimes. This is a fully managed SQL Server Database Engine process hosted in Azure cloud that ensures that your SQL Server database is always upgraded/patched without affecting workload. Azure SQL Database could quickly recover even in the most critical circumstances ensuring that your data is always available.

Azure platform fully manages every Azure SQL Database and guarantees no data loss and high percentage of data availability. Azure automatically handles patching, backups, replication, failure detection, underlying potential hardware, software or network failures, deploying bug fixes, failovers, database upgrades and other maintenance tasks.