配置oracle11g EM db control

    oracle从10g以来一直大力推荐dba通过EM来进行管理，不管个人的喜好如何，都不能否认EM还是具有很强的易用性的。

   前阵子装好了11g后，发现oracle11g文档很多快速管理指南的内容都是通过EM来进行的，但我在文档上并没找到EM的安装说明，于是试着通过10g的说明来对其进行配置。

   从安装软件上看，我并没找到grid control部分，不知道是不是还没有推出，下面简单描述一下db control的配置过程以及遇到的几个问题。

  跟10g的方法相仿，oracle11g也可以通过EMCA来配置db control（在装数据库时候用dbca可以同时创建em）

  登陆oracle用户，执行emca -h命令后可以看到emca的各种配置参数及选项，具体参数的说明可以参考10g中的说明（可在Introduction to Enterprise Manager Advanced Configuration中找到）。执行emca -config dbcontrol db -repos create，按提示输入一些配置后，创建过程开始，可惜建到一半后，SYSAUX空间不足，报错退出了。看来自10G以后SYSAUX空间的要求越来越大了，这里要注意，不光是sysaux表空间，system表空间也要有足够的空闲。

    扩展表空间后执行emca -config dbcontrol db -repos recreate准备重新开始创建，结果刚一开始就报错退出了，竟然是报没有tns监听，lsnrctl status检查监听是启的，用配置的tnsnames连接数据库也能连上，想了很久后怀疑跟监听没有采用动态注册方式有关，可按道理在一些缺省条件达成的情况的下，动态注册是自动生效的。lsnrctl status命令再看了一下，动态注册果然没有启动，没办法只能试试强制指定了，tnsnames里增加

listener1=
    (DESCRIPTION=
      (ADDRESS=(PROTOCOL=tcp)(HOST=oratest)(PORT=1521))
     )

并指定local_listener＝listener1后，动态注册立即生效了。至于为啥，我不知道，新特性还是bug？以后再说吧（10G没怎么玩过，不知道有没这个问题）

重新执行emca -config dbcontrol db -repos recreate，成功，开始drop以前的配置了，之后一切顺利，执行过程及结果消息如下：

$ emca -config dbcontrol db -repos recreate

STARTED EMCA at Aug 29, 2007 8:40:57 AM
EM Configuration Assistant, Version 11.1.0.5.0 Production
Copyright (c) 2003, 2005, Oracle.  All rights reserved.

Enter the following information:
Database SID: test11g
Listener port number: 1521
Password for SYS user: 
Password for SYSMAN user: Email address for notifications (optional):
Outgoing Mail (SMTP) server for notifications (optional):
-----------------------------------------------------------------

You have specified the following settings

Database ORACLE_HOME ................ /oracle11g/product/11g

Local hostname ................ oratest
Listener port number ................ 1521
Database SID ................ test11g
Email address for notifications ...............
Outgoing Mail (SMTP) server for notifications ...............

-----------------------------------------------------------------
Do you wish to continue? [yes(Y)/no(N)]: Y
Aug 29, 2007 8:41:20 AM oracle.sysman.emcp.EMConfig perform
INFO: This operation is being logged at /oracle11g/cfgtoollogs/emca/test11g/emca_2007_08_29_08_40_56.log.
Aug 29, 2007 8:41:30 AM oracle.sysman.emcp.EMReposConfig invoke
INFO: Dropping the EM repository (this may take a while) ...
Aug 29, 2007 8:50:26 AM oracle.sysman.emcp.EMReposConfig invoke
INFO: Repository successfully dropped
Aug 29, 2007 8:50:28 AM oracle.sysman.emcp.EMReposConfig createRepository
INFO: Creating the EM repository (this may take a while) ...
Aug 29, 2007 9:16:21 AM oracle.sysman.emcp.EMReposConfig invoke
INFO: Repository successfully created
Aug 29, 2007 9:17:05 AM oracle.sysman.emcp.EMReposConfig uploadConfigDataToRepository
INFO: Uploading configuration data to EM repository (this may take a while) ...
Aug 29, 2007 9:20:57 AM oracle.sysman.emcp.EMReposConfig invoke
INFO: Uploaded configuration data successfully
Aug 29, 2007 9:21:22 AM oracle.sysman.emcp.util.DBControlUtil configureSoftwareLib
INFO: Software library configured successfully.
Aug 29, 2007 9:21:22 AM oracle.sysman.emcp.EMDBPostConfig configureSoftwareLibrary
INFO: Deploying Provisioning archives ...
Aug 29, 2007 9:26:27 AM oracle.sysman.emcp.EMDBPostConfig configureSoftwareLibrary
INFO: Provisioning archives deployed successfully.
Aug 29, 2007 9:26:27 AM oracle.sysman.emcp.util.DBControlUtil secureDBConsole
INFO: Securing Database Control (this may take a while) ...
Aug 29, 2007 9:27:34 AM oracle.sysman.emcp.util.DBControlUtil secureDBConsole
INFO: Database Control secured successfully.
Aug 29, 2007 9:27:34 AM oracle.sysman.emcp.util.DBControlUtil startOMS
INFO: Starting Database Control (this may take a while) ...
Aug 29, 2007 9:36:05 AM oracle.sysman.emcp.EMDBPostConfig performConfiguration
INFO: Database Control started successfully
Aug 29, 2007 9:36:08 AM oracle.sysman.emcp.EMDBPostConfig performConfiguration
INFO: >>>>>>>>>>> The Database Control URL is <<<<<<<<<<<
Aug 29, 2007 9:37:50 AM oracle.sysman.emcp.EMDBPostConfig invoke
WARNING:
************************  WARNING  ************************

Management Repository has been placed in secure mode wherein Enterprise Manager data will be encrypted.  The encryption key has been placed in the file: /oracle11g/product/11g/oratest_test11g/sysman/config/emkey.ora.   Please ensure this file is backed up as the encrypted data will become unusable if this file is lost.

***********************************************************
Enterprise Manager configuration completed successfully
FINISHED EMCA at Aug 29, 2007 9:37:51 AM

    emkey.ora是密钥的所在地所以如果在生成系统上还是需要备份好的。
$ more /oracle11g/product/11g/oratest_test11g/sysman/config/emkey.ora
KEY=056790FE22685160158605895E3E62FC06D7C153C224D99BAA82236AD677DD962B974B3BDA0A678E9D8278C75662EFEB5A8EB793695A79C131F79B8F8BDBBD03
80955F67D1BFBE675F5E20B9DC6B710A92

都完成之后，执行emctl status dbconsole可以查看状态，emctl start dbconsole和emctl stop dbconsole可以对Database Control Console Process进行启停。缺省端口依然跟10G一样是1158，不过似乎不在支持http，只能用https登陆。我从远程用ie7登陆的时候会警告证书是错误的（linux本地上没有问题），不用管它，继续就可以看到em的登陆界面了，呵呵。

   界面看起来挺友好的，具体功能有待日后研究。