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  Oracle Database Tips by Donald Burleson

Oracle10g Grid Computing with RAC
Chapter 7 - Cache Fusion and Inter Instance Coordination


The GES controls access to data files and control files but not for the data blocks. GES processing includes the coordination for enqueues other than the data blocks.

The resources managed by the GES include the following:

Transaction locks - It is acquired in the exclusive mode when a transaction initiates its first row level change. The lock is held until the transaction is committed or rolled back.

Library Cache locks
- When a database object (such as a table, view, procedure, function, package, package body, trigger, index, cluster, or synonym) is referenced during parsing or compiling of a SQL, DML or DDL, PL/SQL, or Java statement, the process parsing or compiling the statement acquires the library cache lock in the correct mode.

Dictionary Cache Locks
- Global enqueues are used in the cluster database mode. The data dictionary structure is the same for all Oracle instances in a cluster database, as it is for instances in a single-instance database. However, in real application clusters, Oracle synchronizes all the dictionary caches throughout the cluster. Real application clusters use latches to do this, just as in the case of a single-instance Oracle database.

The above text is an excerpt from:

Oracle 10g Grid & Real Application Clusters
Oracle 10g Grid Computing with RAC
ISBN 0-9744355-4-6

by Mike Ault, Madhu Tumma


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