说明：本文为Oracle 11g RAC增删节点指导手册
版本：本文摘自Oracle MOS并对原文进行了修改优化
标签：RAC增删节点、RAC添加节点、RAC增加节点、RAC剔除节点、RAC删除节点
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★ 相关文章
1.增加节点
2.删除节点（本文）
★ 正文（删除节点）
* Steps to delete a Node from Cluster configuration（rac2 will be delete）
====================================================
-- Remove the Database Instance
- To remove the database instance, run the DBCA utility from node rac1 as oracle user.
$ dbca
+ Oracle RAC Database
+ Instance Management
+ Delete an Instance
+ Enter SYS user details and proceed with Instance deletion.
- Check if the redo log thread for the deleted instance is removed by querying the v$log view.
SQL> select GROUP#, THREAD#, MEMBERS, STATUS from v$log;
If not then remove it by using the below query.
SQL> alter database disable thread 2;
- Check if instance is removed from the cluster
Execute the below query from rac1 node.
$ srvctl config database -d dbname
============================================================
-- Detach the Oracle Home
On the remaining one node, run the following to update the inventory with the remaining nodes of the cluster.
$ cd $ORACLE_HOME/oui/bin
$ ./runInstaller -updateNodeList ORACLE_HOME=$ORACLE_HOME "CLUSTER_NODES={rac1}"
============================================================
-- Detach the Grid Home
- Check whether the node to be removed is pinned or unpinned as grid user.
$ olsnodes -t -s
rac1 Active Unpinned
rac2 Active Unpinned
- If the node is pinned then remove it using the following command.
$ crsctl unpin css -n nodename
If they are already unpinned then no need to run the above unpin command.
- From a node that’s not being deleted run the following command as root specifying the node being deleted.
# /u01/app/11.2.0/grid/bin/crsctl delete node -n rac2
- On the remaining node run the following to update the inventory.
su - grid
$ cd $ORACLE_HOME/oui/bin
$ ./runInstaller -updateNodeList ORACLE_HOME=$ORACLE_HOME "CLUSTER_NODES={rac1}" CRS=TRUE
- Use cluvfy to check whether the node was removed successfully.
$ cluvfy stage -post nodedel -n rac2
This concludes the final step of removing the node from the RAC Cluster.
Possible commands：
# <$GRID_HOME>/crs/install/rootcrs.pl -deconfig -force -verbose
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