RMAN Performance Tuning Using Buffer Memory ParametersPosted: 12/01/2011
The purpose of RMAN performance tuning is to identify the bottlenecks for a given backup or restore job and use RMAN commands, initialization parameters, or adjustments to physical media to improve overall performance.
As database sizes continue to grow unabated, with tens to hundreds of terabytes prevalent in customer’s environments, server and storage systems have also dramatically increased in resource, network, and I/O capacity to support required database backup and restore windows. Against this backdrop, RMAN performance tuning becomes more important than ever.
This document details RMAN performance tuning guidelines as they relate to buffer memory usage during backup and restore operations.
These guidelines are targeted to systems where the available I/O exceeds 100 MB/s, while memory, CPU, network consumption, and tape drive throughput do not constrain overall RMAN performance.
This is especially true in very high performance configurations, such as Exadata. In these environments, the default RMAN buffer sizes are usually inadequate and should be increased.
It is assumed that the reader has a basic understanding of RMAN performance tuning concepts. See this doc for an overview of RMAN tuning.