Glossary

logical unit numbers (LUNs)

Three-bit identifiers used on a SCSI bus to distinguish between up to eight devices (logical units) with the same SCSI ID.

MAA environment

An architecture that provides the most comprehensive set of solutions for both unplanned and planned outages because it inherits the capabilities and advantages of both the Oracle Database 10g with RAC and the Oracle Database 10g with Data Guard.

The MAA environment consists of a site containing a RAC production database and a second site containing a cluster that hosts both logical and physical standby databases, or at least one physical or logical standby database.

recovery point objective (RPO)

The maximum amount of data an IT-based business process may lose before causing harm to the organization. RPO indicates the data-loss tolerance of a business process or an organization in general. This data loss is often measured in terms of time, for example, five hours or two days worth of data loss.

recovery time objective (RTO)

The maximum amount of time that an IT-based business process can be down before the organization suffers significant material losses. RTO indicates the downtime tolerance of a business process or an organization in general.