+The goal of the High Availability architecture in Azure SQL Database is to guarantee that your database is up and running minimum of 99.99% of time (For more information regarding specific SLA for different tiers, Please refer [SLA for Azure SQL Database](https://azure.microsoft.com/support/legal/sla/sql-database/)), without worrying about the impact of maintenance operations and outages. Azure automatically handles critical servicing tasks, such as patching, backups, Windows and SQL upgrades, as well as unplanned events such as underlying hardware, software, or network failures. When the underlying SQL instance is patched or fails over, the downtime is not noticeable if you [employ retry logic](sql-database-develop-overview.md#resiliency) in your app. Azure SQL Database can quickly recover even in the most critical circumstances ensuring that your data is always available.
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