Property | Description |
---|---|
Parameter type | Integer |
Default value | Lowest available number; derived from instance start up order and INSTANCE_NUMBER value of other instances. If not configured for Real Application Clusters, then 0 . |
Modifiable | No |
Range of values | 1 to maximum number of instances specified when the database was created |
Basic | Yes |
Real Application Clusters | You must set this parameter for every instance, and all instances must have different values. |
INSTANCE_NUMBER
is a Real Application Clusters parameter that can be specified in parallel mode or exclusive mode. It specifies a unique number that maps the instance to one free list group for each database object created with storage parameter FREELIST GROUPS
.
The INSTANCE
parameter of the ALTER TABLE ... ALLOCATE EXTENT
statement assigns an extent to a particular free list group. If you set INSTANCE_NUMBER
to the value specified for the INSTANCE
parameter, the instance uses that extent for inserts and for updates that expand rows.
The practical maximum value of this parameter is the maximum number of instances specified in the CREATE DATABASE
statement. The absolute maximum is operating system-dependent.
See Also:
Oracle Database Oracle Clusterware and Oracle Real Application Clusters Administration and Deployment Guide for more information