Missing Enterprise Manager on Fedora Core 2

Enterprise Manager for Linux Fedora Core 10g Aug 19, 2001 8:01 PM
Reply
Enterprise Manager Fedora Core 2 with Oracle 10g.
I can not locate OEMAPP anywhere on my disk. I have reinstalled the system several times, but it does not seem to get installed on my computer.
I have no problem with the system otherwise, and can run Enterprise Manager (oemapp.bat) from an XP workstation and connect.
I have selected a custom install as well, and it does not install the program.
I can run
emctl start dbconsole
and run Enterprise Manager thru HTML (localhost:5100)
but would very much like to run the graphical version.
Can anyone assist?
Can I extract it from the CPIO?
Can I download it somewhere?
I have seen that many others have run into this same issue, but have not been able to locate any resolution.
Anyone know how I can install it?
Has anyone tried to run 10g on Fedora core 3?
Thanks.

Fedora Core 2 works fine with the Mega-180. It has good
hardware detection capabilities and driver support for many
devices to get your PC up and running. LCD support is
non-existant for Linux. MSI better do something about this
before the competitors leave them further in the dust.
The longer MSI fails to fully support its products, the greater
the chance the SFF division is going to get turfed for lack
of profitability (eg dismal sales and continued bad reputation
as looks will only get you so far).
Create three CD-ROMs from the ISOs. The fourth CD-ROM
may not be required. The problem here is to find a fast
download mirror. Try http://ftp://ftp.telus.net which is where I got
mine.
If you have the room on your HDD you may just want to stuff
as much into the initial install as possible. Beats having to
find out you need to install something later. Since Linux is
new to you, chances are you will reinstall at a later date anyways
so don't worry if you system is not tuned, etc.
Once you have a working Internet connection to your Mega 180
go grab the latest chipset and video drivers from nVidia. You
don't have to have them to have a working OS. Print out the
installation documentation (easier to read paper).
For Fedora Core docomentation I just downloaded all the
Red Hat 9.0 PDF files and printed them off. This could be
close to 1000 pages or so as I have a stack at least 2"
high. This information makes an excellent base reference
point. Easy to read but rather long.
Then experiment from there. During install - do request
both KDE and Gnome GUIs. This allows you flexibility to
observer how both work. I prefer KDE.
Good luck - keep at it and eventually Linux will make it
to your everyday desktop but keep that M$ stuff handy
as not everything can be done in the Linux world.

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Here they are:
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# Generated by Oracle configuration tools.
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS_LIST =
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(ADDRESS = (PROTOCOL = TCP)(HOST = basement.summerwalk.ca)(PORT = 3789))
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(ADDRESS = (PROTOCOL = TCP)(HOST = basement.summerwalk.ca)(PORT = 3789))
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = /u01/app/oracle/product/11.1.0/db_1)
(PROGRAM = extproc)
(SID_DESC =
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(ORACLE_HOME = /u01/app/oracle/product/11.1.0/db_1)
# TNSNAMES.ORA
124 =
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(ADDRESS = (PROTOCOL = TCP)(HOST = basement.summerwalk.ca)(PORT = 3789))
(CONNECT_DATA =
(SERVICE_NAME=124)
(SERVER=DEDICATED)
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ive got screen shots of the process i am going through, in order to get a sucessfull installation.
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my email address is
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Enterprise Manager for Linux Fedora Core 10g

Enterprise Manager Fedora Core 2 with Oracle 10g.
I can not locate OEMAPP anywhere on my disk. I have reinstalled the system several times, but it does not seem to get installed on my computer.
I have no problem with the system otherwise, and can run Enterprise Manager (oemapp.bat) from an XP workstation and connect.
I have selected a custom install as well, and it does not install the program.
I can run
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and run Enterprise Manager thru HTML (localhost:5100)
but would very much like to run the graphical version.
Can anyone assist?
Can I extract it from the CPIO?
Can I download it somewhere?
I have seen that many others have run into this same issue, but have not been able to locate any resolution.
Anyone know how I can install it?
Has anyone tried to run 10g on Fedora core 3?
Thanks.

u are right there is no EM from linux u have to use winnt's EM and u can connect using connect string which u can create manual by creating the connect string in tnsnames.ora files or u can use net8 easy config.
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eDWIN
email:[email protected]

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Using the Multiserver installation is not a option because
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The multi-server installation creates a single instance of
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at com.sap.smd.agent.SMDAgeletsRuntimeContext.startApplications(SMDAgeletsRuntimeContext.java:154)
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at com.sap.smd.agent.connection.SMDConnectionTask.startOffline(SMDConnectionTask.java:862)
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at com.sap.smd.wily.hostagent.config.AgentConfigParser.parseXml(AgentConfigParser.java:62)
at com.sap.smd.wily.hostagent.SapAgent.loadConfiguration(SapAgent.java:510)
at com.sap.smd.wily.hostagent.SapAgent.start(SapAgent.java:99)
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at com.sap.engine.lib.xml.parser.SAXParser.parse(SAXParser.java:144)
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... 29 more
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at com.sap.engine.lib.xml.parser.XMLParser.scanElement(XMLParser.java:1782)
at com.sap.engine.lib.xml.parser.XMLParser.scanContent(XMLParser.java:2454)
at com.sap.engine.lib.xml.parser.XMLParser.scanElement(XMLParser.java:1855)
at com.sap.engine.lib.xml.parser.XMLParser.scanContent(XMLParser.java:2454)
at com.sap.engine.lib.xml.parser.XMLParser.scanElement(XMLParser.java:1855)
at com.sap.engine.lib.xml.parser.XMLParser.scanDocument(XMLParser.java:2857)
at com.sap.engine.lib.xml.parser.XMLParser.parse0(XMLParser.java:235)
at com.sap.engine.lib.xml.parser.AbstractXMLParser.parseAndCatchException(AbstractXMLParser.java:145)
at com.sap.engine.lib.xml.parser.AbstractXMLParser.parse(AbstractXMLParser.java:165)
at com.sap.engine.lib.xml.parser.AbstractXMLParser.parse(AbstractXMLParser.java:245)
at com.sap.engine.lib.xml.parser.Parser.parse_DTDValidation(Parser.java:260)
at com.sap.engine.lib.xml.parser.Parser.parse(Parser.java:271)
at com.sap.engine.lib.xml.parser.SAXParser.parse(SAXParser.java:125)
... 31 more

Hello Gopal,
Please refer to section Wily Introscope setup for BOE 4.0 of this wiki:
Managed System Setup of BOE 4.0 system in Solman 7.1 - SAP Solution Manager Setup - SCN Wiki
You may also found interesting
Maintenance of Product in the System Landscape - SAP Solution Manager Setup - SCN Wiki
https://service.sap.com/sap/support/notes/1722874
https://service.sap.com/sap/support/notes/1357901
Best Regards.
Luis Roel

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Hello,
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After going through Oracle Database pre-installation documentation.
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Regards

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Thank you all...thanks for your time.

Check the below documents are of help in solving your problem:-
Starting and Stopping the Oracle Enterprise Manager Console
http://download-east.oracle.com/docs/cd/B16240_01/doc/server.102/b14196/em_manage002.htm#sthref145
Accessing the Oracle Enterprise Manager Database Control
http://download-east.oracle.com/docs/cd/B16240_01/doc/server.102/b14196/em_manage003.htm#sthref146
Getting Started with Oracle Enterprise Manager
http://download-east.oracle.com/docs/cd/B16240_01/doc/server.102/b14196/em_manage.htm#sthref126
Oracle® Database 2 Day DBA 10g Release 2 (10.2)
http://download-east.oracle.com/docs/cd/B16240_01/doc/server.102/b14196/toc.htm
Oracle Enterprise Manager Grid Control Quick Installation Guide for Windows (32-bit)
http://download-east.oracle.com/docs/cd/B16240_01/doc/install.102/b31288/toc.htm
Oracle Enterprise Manager 10g Release 2 (10.2) - Documentation Library
http://download-east.oracle.com/docs/cd/B16240_01/doc/nav/portal_booklist.htm

Enterprise Manager Missing Features

The 10.1.3 enterprise manager took away a lot of the things I could do in 10.1.2. Why? Like creating OC4J instances, changing jvm options, etc. I see some improvements in other areas but so far I feel like the new em console is less capable...

Prior to 10.1.3, Enterprise Manager AS Control used proprietary APIs for Application Server management. With 10.1.3, AS Control has moved to using standard Java and J2EE APIs (using JMX MBeans) mandated by the J2EE 1.4 spec via JSR-77.
Given this step forward in architecture and manageability, AS Control in 10.1.3 did lose a few features which were available in the previous release.
Moving forward, AS Control in the upcoming OracleAS 10.1.3.1 SOA release will support creating and removing OC4J instances, defining custom OC4J configuration groups, and managing OC4J instances running on multiple JVMs.

Oracle Enterprise Manager Agent deployment (Installation and Configuration) Error

Hello,
I am trying to create an agent on a linux server using Oracle Enterprise Manager 12.1.0.3. The user is created with root privilege on the server, by change /etc/sudoers entry username the same as the root entry. After that I tried to add host target by clicking Setup->Add Target->Add target Manually->Add Host Targets in the Oracle Enterprise Manager.
In the Add Target view: I clicked on add, then I entry host and platform information. After that I click next. Then I provided the Linux x86-64 : Installation Details for
Installation Base Directory, Instance Directory, Name Credential ... then click next. then click Deploy Agent.
In the Add Host Status view: stages Initialization and Remote Prerequisite Check successfully passed, but in the stage Agent Deployment, it failed in the Installation and Configuration phrase of the Agent Deployment stage.
The log content is shown below. There are numerous SEVERE Errors. But I don't have much experience in dealing with these type of problems. I thank you in advance for all the helps.
lf
WARNING: Validation of XML schema is disabled because AggregateDescriptions.xsd could not be found
INFO: Creating new CFM connection
INFO: Creating a new logger for oracle.sysman.top.agent
INFO: Unmarshalling /users/ncgf/em_agent/core/12.1.0.3.0/inventory/ContentsXML/ConfigXML/oracle.sysman.top.agent.12_1_0_3_0.xml
INFO: Creating a new logger for OuiConfigVariables
INFO: Unmarshalling /users/ncgf/em_agent/core/12.1.0.3.0/inventory/ContentsXML/ConfigXML/OuiConfigVariables.1_0_0_0_0.xml
INFO: Aggregate Description oracle.sysman.top.agent:12.1.0.3.0:common successfully loaded
INFO: Aggregate Description OuiConfigVariables:1.0.0.0.0:common successfully loaded
INFO: Successfully returning from CfmFactory.connect()
INFO: Cfm.save() was called
INFO: Cfm.save(): 2 aggregate instances saved
INFO: oracle.sysman.top.agent:IAction.perform() was called on {Action state:configuration in CfmAggregateInstance: oracle.sysman.top.agent:12.1.0.3.0:common:family=CFM:oh=/users/ncgf/em_agent/core/12.1.0.3.0:label=1}
INFO: Framework waiting for Action to complete at 15:08:10.272
INFO: CfwProgressMonitor:actionProgress:About to perform Action=configuration Status=is running with ActionStep=0 stepIndex=0 microStep=0
WARNING: Skipping environment variable line: "}": oracle.sysman.emCfg.common.CfwException: A non-empty environment line must contain "=": }
WARNING: Failed to read environment variable file /users/ncgf/em_agent/core/12.1.0.3.0/install/envVars.properties: java.io.FileNotFoundException: /users/ncgf/em_agent/core/12.1.0.3.0/install/envVars.properties (No such file or directory)
INFO: oracle.sysman.top.agent:About to execute plug-in Agent Configuration Assistant
INFO: oracle.sysman.top.agent:The plug-in Agent Configuration Assistant is running
INFO: oracle.sysman.top.agent:Internal PlugIn Class: oracle.sysman.agent.config.AgentConfiguration
INFO: oracle.sysman.top.agent:Classpath = /users/ncgf/em_agent/core/12.1.0.3.0/oui/jlib/srvm.jar:/users/ncgf/em_agent/core/12.1.0.3.0/jlib/agentConfig.jar:/users/ncgf/em_agent/core/12.1.0.3.0/jlib/emConfigInstall.jar:/users/ncgf/em_agent/core/12.1.0.3.0/sysman/jlib/emagentSDK.jar:/users/ncgf/em_agent/core/12.1.0.3.0/modules/oracle.http_client_11.1.1.jar:/users/ncgf/em_agent/core/12.1.0.3.0/sysman/jlib/log4j-core.jar
INFO: oracle.sysman.top.agent:AgentConfiguration:agent configuration has been started
INFO: oracle.sysman.top.agent:Parametes passed to agent configuration are:
1.ORACLE_HOME=/users/ncgf/em_agent/core/12.1.0.3.0
2.AGENT_PORT=3872
3.ORACLE_HOSTNAME=nsn175-89.us.oracle.com
4.b_doDiscovery=false
5.AGENT_BASE_DIR=/users/ncgf/em_agent
6.AGENT_INSTANCE_HOME=/users/ncgf/em_agent/agent_inst
7.s_hostname=nsn175-89.us.oracle.com
8.OMS_HOST=nsn175-105.us.oracle.com
9.b_startAgent=false
10.b_secureAgent=true
11.b_chainedInstall=false
12.b_forceConfigure=false
13.EM_UPLOAD_PORT=4904
14.b_forceAgentDefaultPort=false
15.s_staticPorts=
16.PROPERTIES_FILE=
b_skipValidation=false
INFO: oracle.sysman.top.agent:Validating OMS_HOST and EM_UPLOAD_PORT
INFO: oracle.sysman.top.agent:Validating with http protocol ...
INFO: oracle.sysman.top.agent:URL framed is:http://nsn175-105.us.oracle.com:4904/empbs/genwallet
SEVERE: oracle.sysman.top.agent:Connection refusedUnexpected end of file from server
INFO: oracle.sysman.top.agent:Validating with https protocol ...
INFO: oracle.sysman.top.agent:URL framed is:https://nsn175-105.us.oracle.com:4904/empbs/genwallet
SEVERE: oracle.sysman.top.agent:The EM_UPLOAD_PORT passed is a secure port. Hence AGENT_REGISTRATION_PASSWORD or s_encrSecurePwd should be passed
INFO: oracle.sysman.top.agent:EM Protocol Switch determined: https
INFO: oracle.sysman.top.agent:Performing free port detection..
INFO: oracle.sysman.top.agent:Trying for host : nsn175-89/10.134.175.89 and port : 3872
INFO: oracle.sysman.top.agent: Trying for host : /127.0.0.1 and port : 3872
INFO: oracle.sysman.top.agent:** Agent Port Check completed successfully.**
INFO: oracle.sysman.top.agent:Agent Port from User Passed Port3872
INFO: oracle.sysman.top.agent:Paths after canonical format conversions are :
1. state_dir=/users/ncgf/em_agent/agent_inst
2. agentBaseDir=/users/ncgf/em_agent
3. oraHome=/users/ncgf/em_agent/core/12.1.0.3.0
INFO: oracle.sysman.top.agent:Parent directory of agent instance home:/users/ncgf/em_agent
INFO: oracle.sysman.top.agent:AgentConfiguration:perform:AgentPortHandler for /users/ncgf/em_agent/core/12.1.0.3.0 and hosts=nsn175-89.us.oracle.com returned Port to Use=3872
INFO: oracle.sysman.top.agent:Instantiating emctl.template file #DEFAULT_EMSTATE# with /users/ncgf/em_agent/agent_inst
INFO: oracle.sysman.top.agent:Writing the following contents into /users/ncgf/em_agent/core/12.1.0.3.0/install/oragchomelist
INFO: oracle.sysman.top.agent:/users/ncgf/em_agent/core/12.1.0.3.0:/users/ncgf/em_agent/agent_inst
INFO: oracle.sysman.top.agent:Both /etc/oragchomelist and /var/opt/oracle/oragchomelist does not exist.
INFO: oracle.sysman.top.agent:Executing emctl deploy agent command...
INFO: oracle.sysman.top.agent:AgentConfiguration: Executing emctl deploy agent command...
INFO: oracle.sysman.top.agent:Executing the command: /users/ncgf/em_agent/core/12.1.0.3.0/bin/emctl deploy agent -L -o nsn175-105.us.oracle.com:4904 -N /users/ncgf/em_agent/agent_inst nsn175-89.us.oracle.com:3872 nsn175-89.us.oracle.com
INFO: oracle.sysman.top.agent:Creating shared install...
INFO: oracle.sysman.top.agent:Source location: /users/ncgf/em_agent/core/12.1.0.3.0
INFO: oracle.sysman.top.agent:Destination (shared install) : /users/ncgf/em_agent/agent_inst
INFO: oracle.sysman.top.agent:Secure Mode: No
INFO: oracle.sysman.top.agent:DeployMode : agent
INFO: oracle.sysman.top.agent:
INFO: oracle.sysman.top.agent:Creating directories...
INFO: oracle.sysman.top.agent:Creating private.properties...
INFO: oracle.sysman.top.agent:Creating blackouts.xml...
INFO: oracle.sysman.top.agent:Creating targets.xml...
INFO: oracle.sysman.top.agent:Creating emctl control program...
INFO: oracle.sysman.top.agent:Creating emtgtctl control program...
INFO: oracle.sysman.top.agent:Agent will not be secured.
INFO: oracle.sysman.top.agent:Secure REPOSITORY_URL found. New agent should be configured for secure mode
INFO: oracle.sysman.top.agent:Secure emdWalletSrcUrl found. New agent should be configured for secure mode
INFO: oracle.sysman.top.agent:Oracle Enterprise Manager Cloud Control 12c Release 3
INFO: oracle.sysman.top.agent:Copyright (c) 1996, 2013 Oracle Corporation. All rights reserved.
INFO: oracle.sysman.top.agent:Property 'agentTZRegion' is missing from /users/ncgf/em_agent/agent_inst/sysman/config/emd.properties. Updating it...
INFO: oracle.sysman.top.agent:An agentTZregion of 'US/Pacific' is installed in /users/ncgf/em_agent/agent_inst/sysman/config/emd.properties.
INFO: oracle.sysman.top.agent:The command: /users/ncgf/em_agent/core/12.1.0.3.0/bin/emctl deploy agent -L -o nsn175-105.us.oracle.com:4904 -N /users/ncgf/em_agent/agent_inst nsn175-89.us.oracle.com:3872 nsn175-89.us.oracle.com completed with status=0
SEVERE: oracle.sysman.top.agent:Securing of agent step will be skipped because of the following reasons:
1. Agent Registration Password was not passed.
2. b_secureAgent was passed as false
3. The flag -forceConfigure was assed from agentDeploy.sh
INFO: oracle.sysman.top.agent:Plugin File:/users/ncgf/em_agent/plugins.txt
INFO: oracle.sysman.top.agent:Plugin Homes found.
INFO: oracle.sysman.top.agent:Executing command :/users/ncgf/em_agent/core/12.1.0.3.0/perl/bin/perl /users/ncgf/em_agent/core/12.1.0.3.0/bin/AgentPluginDeploy.pl -oracleHome /users/ncgf/em_agent/core/12.1.0.3.0 -agentDir /users/ncgf/em_agent -pluginIdsInfoFile /users/ncgf/em_agent/plugins.txt -action configure -emStateDir /users/ncgf/em_agent/agent_inst
INFO: oracle.sysman.top.agent:
INFO: oracle.sysman.top.agent:
INFO: oracle.sysman.top.agent:The Agent emStateDir location passed is /users/ncgf/em_agent/agent_inst
INFO: oracle.sysman.top.agent: The log file is /users/ncgf/em_agent/agent_inst/install/logs/agentplugindeploy_2013_10_16_15_08_11.log
INFO: oracle.sysman.top.agent: The temp file created to check R/W permissions in Oraclehome: /users/ncgf/em_agent/core/12.1.0.3.0 is /users/ncgf/em_agent/core/12.1.0.3.0/rwFile
INFO: oracle.sysman.top.agent:Plugin command completed with status=0
INFO: oracle.sysman.top.agent:Executing command :/users/ncgf/em_agent/agent_inst/bin/emctl listplugins agent -type all
INFO: oracle.sysman.top.agent:Oracle Enterprise Manager Cloud Control 12c Release 3
INFO: oracle.sysman.top.agent:Oracle Enterprise Manager Cloud Control 12c Release 3
INFO: oracle.sysman.top.agent:Copyright (c) 1996, 2013 Oracle Corporation. All rights reserved.
INFO: oracle.sysman.top.agent:Copyright (c) 1996, 2013 Oracle Corporation. All rights reserved.
INFO: oracle.sysman.top.agent:---------------------------------------------------------------
INFO: oracle.sysman.top.agent:---------------------------------------------------------------
SEVERE: oracle.sysman.top.agent:ERROR: The Management Agent configuration failed. The plug-in configuration for the oracle.sysman.oh monitoring plug-in may have failed, or this plug-in may not be present in the Management Agent software. Ensure that the Management Agent software has the oracle.sysman.oh monitoring plug-in, if not then retry the operation. If the agent software has the oracle.sysman.oh monitoring plug-in, view the plug-in deployment log /users/ncgf/em_agent/agent_inst/install/logs to check if the plug-in configuration for the oracle.sysman.oh monitoring plug-in failed.
SEVERE: oracle.sysman.top.agent:Agent configuration has failed
INFO: oracle.sysman.top.agent:AgentConfiguration:agent configuration finished with status = false
INFO: oracle.sysman.top.agent:AgentConfiguration:agent configuration finished with status = false
INFO: oracle.sysman.top.agent:The plug-in Agent Configuration Assistant has failed its perform method
INFO: Cfm.save() was called
INFO: Cfm.save(): 2 aggregate instances saved
INFO: done waiting for Action from 15:08:10.272
Thank you for your help AkankshaSheoranKaler. I have executed the following command based on your request. If there is any issue, please let me know. Thanks!
"Can you run this command to make sure that the agents bits were downloaded correctly : oms home /bin /emcli verify_updates
Share the output of the command. I am suspecting this is a know issue (Bug 17300008) but i will wait for your output. Also if you can open an SR with oracle support to track this issue and its resolution. "
[ncgf@nsn175-105 bin]$ ./emcli setup -url=https://nsn175-105.us.oracle.com:7803/em -u sername=SYSMAN
Oracle Enterprise Manager 12c 3.
Copyright (c) 1996, 2013 Oracle Corporation and/or its affiliates. All rights reserve d.
The configuration directory "/users/ncgf" may not be local. See the "dir" option in t he help for the setup command.
Do you want to continue using this directory? [yes/no] yes
Enter password
Emcli setup successful
[ncgf@nsn175-105 bin]$ ./emcli verify_updates
Verifying updates. Starting validation...
Type       : Plug-in
Description: Demo Hostsample Test Plugin
Attributes
        Version: 1201000100
        Revision: 0
        OS Platform: Generic Platform
        Plug-in Name: Demo Host Sample Plugin
Archives are missing from the Software Library. Unable to determine the URL for downloading the update. The update might not have come from Oracle Enterprise Manager Store.
For each update with missing archives, emcli import_update can be used with a -force option to re-upload the archives to the Software Library.

   Hello AkankshaSheoranKaler
We have done the following, but we aren't able to resolve this issue. Thank you for your help!
lf
“This happen if the software library is not accessible, readable or unmounted (if it is in shared file system).”
On Enterprise Manager server [nsn175-105], we did the following:
1. we modified /etc/exports to include this line: /export *(rw,no_root_squash,sync)
we start nfs service by executing command “service nfs start”.
On Management Agent server (nsn175-89), we verified that we are able to mount /export directory of EM server.
On Management Agent server, we started firefox browser and were able to run successfully https://nsn175-105.us.oracle.com:4904/empbs/genwallet
After making this change, we ran agent deployment again. We encountered the same error as shown above.
“You can fix the software library or you can download the agent bits in offline mode.”
For fixing the software library, select Setup->Provision and Patching->Offline Patching, then select Offline Patching radio button, download: https://updates.oracle.com/download/em_catalog.zip. Next upload this zip file.
“Try downloading the bits again”
We are not sure what agent bits are. Would you please explain this and provide procedure how we can download this?
(Here I have attempted to fix the software library, but I am new to Enterprise Manager and not sure how to interpret this).

Oracle Enterprise Manager "Performance" tab (Oracle 10g)

Hi,
How to I make a report based on Performance TAB.
View Data -> Historical
Sessions
Runnable Process
Active Sessions
Instance Disk i/o
Instance throughput
Explain : What is (example :*what is session for?* ) , What is X and Y (example :*what is X = Y= Time and date*)
Please reply.. I need it by today.. :(

The help file explains it a lot better than I can... therefore:
Interpreting the Host: Average Runnable Processes Chart
If you have opted to show both the CPU cores and CPU threads,
consistent values somewhere between the two line values may
indicate that too many users are waiting in line for CPU time.
Compare the values with those of CPU Used in the Average Active
Sessions chart. If the sessions value is low and the run queue
length value is high, this indicates that something else on the host
other than your database is consuming the CPU.
If you have selected Memory Access mode, the Host chart does
not initially display historical data, except when the screen was
loaded recently and cached historical data is still available. Host data
is cached starting from the time the screen was first accessed,
and gradually fills the history on the Host chart.
Interpreting the Average Active Sessions Chart
The Session Count is computed by categorizing the time
that all active sessions consumed in the last sampling interval
into different wait classes, summing the amount in each wait class,
and dividing it by the sampling interval. For example, If there
are 3 active sessions in the last 15-second sampling interval, and
each session spent half of the time (7.5 seconds each) on CPU
and half of the time idling, then 3 x 7.5 / 15 = 1.5 active sessions
on CPU appear for that sampling interval.
Compare the peaks on the Average Active Sessions chart with those
on the Instance Throughput charts. If the Average Active Sessions
chart displays a large number of sessions waiting, indicating internal
contention, but throughput is high, then the situation may be
acceptable. The database is probably also performing efficiently if
internal contention is low but throughput is high. However, if internal
contention is high but throughput is low, then consider tuning the database. Selecting Memory Access Mode for Slow or Hung Systems
You can click the Monitor In Memory Access Mode link in the Related Links section to enable Memory Access Mode. The Database Performance page reappears with a Disable Memory Access Mode button and a Switch to SQL Access Mode button in the upper right corner.
You can temporarily disable Memory Access Mode by clicking this button, upon which the Database Performance page reappears in SQL Access Mode. To reactivate Memory Access Mode, click the Monitor In Memory Access Mode link again, then click Enable Memory Access Mode when the Database Performance page reappears.
In Memory Access Mode, performance statistics are retrieved directly from the Shared Global Area (SGA) using optimized/lightweight system-level calls as an alternative to SQL. Memory Access mode avoids the computation associated with parsing and executing SQL statements, thereby making it ideal for severe cases of library cache contention that can prevent the instance from being monitored in SQL Mode. You should switch to Memory Access Mode for slow or hung systems.
Pages in Memory Access Mode contain data sampled at a higher frequency than pages in SQL Mode. (Charts may appear to be slightly different from SQL mode for this reason.) Consequently, Enterprise Manager provides better information about where events begin and end, and can also handle short-duration events that might otherwise be missed.
>
It basically tells you how much of a given resource was used at a point in time.
John

Missing Enterprise Manager on Fedora Core 2

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