Which data tier should be selected for a mission-critical database that must be highly available at all times?

In the context of data tiers, Tier 1 is designed for mission-critical applications that require high availability, performance, and reliability. This tier typically includes robust infrastructure with features such as redundant systems, high-speed storage, and advanced data protection mechanisms to ensure uptime and data integrity at all times.

Selecting Tier 1 for a mission-critical database means that the organization prioritizes availability and performance over costs. This is crucial for databases that support essential business functions, as any downtime can lead to significant negative impacts on operations and revenue.

Other tiers, such as Tier 2, Tier 3, and Tier 4, may provide varying levels of performance and availability but do not typically meet the stringent requirements of mission-critical applications. Tier 2 might offer moderate availability and performance, Tier 3 is often suitable for less critical applications, and Tier 4 is usually associated with backup and archival storage rather than high availability. Each of these tiers serves different use cases, making Tier 1 the optimal choice for dependability in mission-critical situations.