Online Index Rebuild
Online Index Rebuild is a database maintenance operation that allows rebuilding or reorganizing indexes while the database remains accessible for read and write operations. It enables administrators to optimize index performance, reclaim fragmented space, or modify index properties without significant downtime. This is a critical feature in production environments where continuous availability is required.
Developers and database administrators should use Online Index Rebuild when maintaining large, high-availability databases that cannot tolerate extended downtime for maintenance. It is essential for scenarios like reducing index fragmentation in OLTP systems, updating index definitions in live applications, or performing routine optimizations in 24/7 services. This minimizes disruption to users and applications compared to offline rebuilds.