NOTE
Installing and configuring Enterprise Manager Grid Control 11g
is beyond the scope of this book; see the book Oracle Database
11g High Availability with RAC, Flashback & Data Guard for more
information.
In Figure 10-19, you see the characteristics of one of the redo log members for the cluster;
note that I placed one of the group??™s members on the DATA1 disk group and the other on the
RECOV1 disk group. Because each disk group is mirrored on two different raw devices, you
have the equivalent of four-way redundancy for the members of your redo log group.
RAC Characteristics
A RAC instance is different in many ways from a standalone instance; in this section, I will show
you the initialization parameters that are specific to a RAC database. In addition, we??™ll show you
some of the data dictionary views and dynamic performance views that are either unique to a
RAC or have columns that are only populated when the instance is part of a RAC.
FIGURE 10-19 EM DB Control RAC redo log group members
Chapter 10: Real Application Clusters 379
Server Parameter File Characteristics
As you saw previously in the section ???Creating the RAC Database with the Database Configuration
Assistant,??? the server parameter file (SPFILE) resides on the DATA1 disk group and therefore is
shared by each node in the cluster. Within the SPFILE, you can assign different values for given
parameters on an instance-by-instance basis; in other words, the value for an initialization parameter
can differ between instances.
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