||Oracle Tips by Burleson
Oracle10g Grid Computing
Chapter 12 - RAC Design Considerations
Tablespace Design in Real Application Clusters
following criteria must also be considered for separating database
objects into tablespaces:
should be separated from indexes.
read-only tables to READ-ONLY tablespaces.
smaller reference tables in the same tablespace.
strategy to group objects into tablespaces will improve the
performance of Oracle's dynamic resource mastering. Oracle’s "dynamic
resource re-mastering by datafiles" algorithm re-distributes GCS
resources to the instance where they are needed most. This
re-mastering strategy is designed to improve resource operation’s
efficiency. Oracle re-masters cache blocks to the instance with which
the cache blocks are most closely associated based on historical
access patterns. As a result, resource operations, after re-mastering,
require minimal communication with remote instances through the GES
Extent Management and Locally Managed Tablespaces
and de-allocating extents are expensive operations that should be
minimized. Most of these operations in Real Application Clusters
require inter-instance coordination. Keep in mind that a high rate of
extent management operations can adversely affect performance in Real
Application Clusters environments more than in single instance
environments. This is especially true for dictionary-managed
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