This document introduces the requirements for a database system to run at high speed around the clock and how to achieve 24x7 availability. It also discusses the reliability and high availability features of Oracle databases.
This document explains how to assess a database system's required availability, describing the concept of 24x7 operation and the factors that affect uptime. It provides methods for analyzing workload patterns, estimating acceptable downtime, and deciding whether continuous operation is needed.
It also compares different maintenance approaches, such as UNRECOVERABLE vs. RECOVERABLE index creation, and discusses the cost‑performance trade‑offs of higher availability, including hardware redundancy, backup strategies, and staffing considerations. This manual is written in Chinese.
90% reliability implies about 2.4 hours of downtime per day, 1 day per 10 days, or roughly 36.5 days per year.