ACTIVE_INSTANCE_COUN of Oracle 10 Gb memory

ACTIVE_INSTANCE_COUN of Oracle 10 Gb memory is used in the cluster environment. It is deemed to be null, that is, all the nodes are master nodes. Www.2cto.com is in the RAC environment of the two sites, you can configure the master and compute nodes to run the show parameters active_instance_countNAME type value parameter ------------- active_instance_count interger command to set active_instance_count to 1RAC dynamic on both nodes, the instance that is triggered first is the primary vertex, followed by the standby vertex.
The master site accepts requests from users, the master site accepts requests when the master site fails, and the master site recovers, if the master region has been accepted, request select INSTANCE_NUMBER, INSTANCE_NAME, INSTANCE_ROLE from v $ instance; INSTANCE_NUMBER INSTANCE_NAME INSTANCE_ROLE primary keys ---------------------------- 1 ok1 secondary_instance2 ok2 primary_instance if the value is greater than the number of instances 2, it is the master node.