CLUSTER_DATABASE

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Property	Description
Parameter type	Boolean
Default value	false
Modifiable	No
Range of values	true | false
Basic	Yes
Real Application Clusters	For all instances, the value must be set to TRUE.

CLUSTER_DATABASE is a Real Application Clusters parameter that specifies whether or not Real Application Clusters is enabled.
Note:
1. This parameter was introduced in Oracle9i. It effectively replaces PARALLEL_SERVER in earlier releases.

2. Query for the current value of the parameter

select name, value, isdefault, isses_modifiable, issys_modifiable,

isinstance_modifiable, isdeprecated, description

from v$parameter where upper(name) = 'CLUSTER_DATABASE';

NAME	VALUE	IS DEFAULT	ISSES_ MODIFIABLE	ISSYS_ MODIFIABLE	ISINSTANCE_ MODIFIABLE	IS DEPRECATED	DESCRIPTION
cluster_database	FALSE	TRUE	FALSE	FALSE	FALSE	FALSE	if TRUE startup in cluster database mode

Oracle initializatoin parameters