Identify the missing word(s) in the following sentence within the context of Microsoft Azure. Azure Infrastructure as a Service (IaaS) solutions are frequently used when migrating your on-premises environment to the cloud. There are several tools available to help with the migration process. Platform as a Service (PaaS) provides a complete development and deployment environment in the cloud, which can be used for simple cloud-based applications as well as for advanced enterprise applications. PaaS comes in several different service tiers. Each tier has varying capabilities, which provide a wide range of options when choosing this platform. Azure SQL Database [?] is a compute tier that will automatically scale up or down the resources for a given database based on demand. If the workload no longer requires compute resources, the database will become “paused” and you will not be charged during the period when the database is in this state. When a connection attempt is made, the database will “resume” and become available.