18cad28b_rver_Pools___All_Things_Oracle__Attribute
[Values and Format] A string of server names in the following format: server_name1 server_name2 … [Description] Oracle Clusterware automatically manages this attribute, which contains the space-delimited list of servers that are currently assigned to a server pool. [Attribute] 
ACTIVE_SERVERS
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I M P O R T A N C E
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An Introduction to 11.2 RAC Server Pools – All Things Oracle
Attribute