Enterprise Manager Database Control only starts on one node of my RAC cluster. How do I start it on another node? [ID 335571.1]

本文介绍如何在RAC集群的另一节点上启动Database Control控制台。默认情况下，控制台仅在一个节点启动以减少数据库连接数。通过使用emca命令进行重新配置，可以改变控制台的启动节点。

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Enterprise Manager Database Control only starts on one node of my RAC cluster. How do I start it on another node? [ID 335571.1]

Enterprise Manager Database Control only starts on one node of my RAC cluster. How do I start it on another node? [ID 335571.1]

		修改时间 23-AUG-2007 类型 HOWTO 状态 MODERATED

In this Document
Goal
Solution

This document is being delivered to you via Oracle Support's Rapid Visibility (RaV) process, and therefore has not been subject to an independent technical review.

Applies to:

Enterprise Manager for RDBMS - Version: 10.2.0.1
Information in this document applies to any platform.

Goal

Enterprise Manager Database Control only starts on one node of my RAC cluster. How do I start it on another node?

Solution

By default, the Database Control Console will only start on the local node. On every other node of the cluster, only the Enterprise Manager agent will start. This is a tuning measure incorporated in the design of Database Control version 10.2.x because the Database Control Console opens a number of connections to the database - starting only one console limits these connections.

On every other node, the commands emctl start dbconsole and emctl stop dbconsole only start and stop the agent. Each of the remote agents will upload their respective data to the console running on the local node.

The following command reconfigures the current Database Control setup. The action of the command is also mention below.

emca -reconfig dbcontrol –cluster –EM_NODE <nodename> -EM_SID_LIST <SID list>
where <nodename> is the RAC cluster name of a host and <SID list> is a comma-separated list of database system identifiers.

    1. Starts a Database Control Console on <nodename>, if none has been started
    2. Redirects the agents monitoring the database instances in <SID list> so that they
    upload their data to the console running on <nodename>. Also, agents monitoring
    database instances on <nodename> will also upload their data to the local console. Note that if
    you do not pass -EM_NODE or -EM_SID_LIST at the command line, you will be prompted for them.
    -EM_NODE defaults to the local host if not specified when prompted. -EM_SID_LIST defaults to all
    database instances if not specified.

So, because the way in which it was designed, the dbconsole could not run on several nodes serving the same instances in the same time.

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