Re: v$instance -- meaning of INSTANCE_ROLE ?
- From: "Yong Huang" <dmarc-noreply@xxxxxxxxxxxxx> (Redacted sender "yong321" for DMARC)
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Wed, 16 Mar 2016 14:57:01 +0000 (UTC)
under what circumstances the INSTANCE_ROLE column in
gv$instance would have a value of 'SECONDARY_INSTANCE'?
Hi Brad,
Before Oracle 11g, if you set active_instance_count=1 on a 2-node RAC, the
instance you started later is the secondary instance and will not accept
connections unless the instance started first fails. See
ORA-12520 when Connecting to the Second Instance (Doc ID 731241.1)
I don't have 10g RAC I can test on. On 11g, the parameter is deprecated.
Although you can still set it (see Doc IC 1480157.1) and v$parameter still
shows the value you set, it has no effect, and v$instance.instance_role is
always PRIMARY_INSTANCE. The active/secondary instance functionality is done
through preferred/standby service. Moving this from instance to listener
service is good because the client may be notified earlier about which instance
to connect.
Yong Huang
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