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If you use PuTTY to connect to your instance and get either of the following errors, Error: Server refused our key or Error: No supported authentication methods available, verify that you are connecting with the appropriate user name for your AMI. Enter the user name in the User name box in the PuTTY Configuration window.

The appropriate user names are as follows:


  • For an Amazon Linux AMI, the user name is ec2-user.
  • For a RHEL AMI, the user name is ec2-user or root.
  • For an Ubuntu AMI, the user name is ubuntu or root.
  • For a Centos AMI, the user name is centos.
  • For a Fedora AMI, the user name is ec2-user.
  • For SUSE, the user name is ec2-user or root.
  • Otherwise, if ec2-user and root don't work, check with the AMI provider.

Thanks
Osama
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SQL> startup mount ;
ORA-27102: out of memory
SVR4 Error: 12: Not enough space
Additional information: 1671
Additional information: 16106127360
Additional information: 64424509440

The Above error appeared When trying to start Oracle 12c on Solaris 11.3, this is published bug 

Bug:20635316 - 12C DATABASE INSTANCE STARTUP FAILS WITH ORA-27102: OUT OF MEMORY

Solaris using something called OSM , Optimized Shared memory You can know more about it here 

To avoid this error as workaround just set the parameter

_use_osm=FALSE


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Osama
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In this lesson i will show you how to configure AWS command line, and how to start working with your AWS account thru command line with very simple and basic steps :-


  • First of i will assume that you don't have any user or group in your AWS console
  • from the AWS Console :-


  • From IAM ( Identity access management ) Choose Group Create Group with permission Administrator access and then hit create.

  • create user and add that user to the group in my case the group name shown above, save the secret key and access ID as CSV.
  • Now from this link here, Download AWS Command Line Interface depend on your operating system and open cmd , terminal ... etc.
  • Now from Dos enter AWS configure and fill the information like the below:-

  • Open the command line and test if it's connected to AWS now.

You can learn more about the command line from AWS documentation , if you recive the following error 

"Could not connect to the endpoint URL: "https://s3.london.amazonaws.com/"

Then make sure you are on the right Region.

Thanks
Osama




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Once you create AWS you should activate "Activate MFA on your root account" 



and do that you should use your phone (Iphone, Android) download google authenticator app from the app store/Google Play once the installation is done Scan the QR and Enter the code, the code will be change automatically, if the first try not working and you receive this error " failed to associate the token" uninstall the app and try again.
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Osama
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Upon my colleague Mohammad Altraimat i am publishing this article

 let me gives you a brief  about him , he is currently working with as Siebel Freelance , ensure the functionality of systems, support and train clients to use the systems and collect the requirements from the client and ensure it reflected during his career he developed this document to help people to understand more about Siebel.

You Can Share it But please mention the source of the article or you ask me to share the article with you.

You can find the article here.
Thank you
Cheers
Osama 
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if you want to learn more about web-logic, Register now "Weblogic 101 for DBA"

i will cover different topic during the webinar to give you a better idea about the weblogic concept

Register now here
Thank you 
Osama
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The Data Uploaded to the Cloud Vendor Amazon web services ( AWS ) But the client decided to move their data on-premises for the first sight you will think this is hard and needs  a lot of work but thank you SQL Developer and Jeff Smith and he is the product manage for SQL Developer amazing man by the way and crossfitter  at the same time :P

However Lets start :-


  •  Open SQL developer
  • Choose Database copy option from tools menu.


  • Select source database should be AWS
    • Provide hostname only for the AWS
    • Listener Port
    • DB Name
    • Username/Password 
    • Test your connection.
  • Select destination database should be Oracle 

  • Provide hostname only for the AWS.
      • Provide hostname/IP for the server.
      • Listener Port
      • DB Name
      • Username/Password 
      • Test your connection.



    • Press Next Button, if the migration done before on the same schema press replace and next.

                                        

    • Press Next after choose what you want to move, Data, Functions , Or trigger ... etc

    • Check Proceed to summary and Press the finish button the migration will start after this,  it will take some time depend on internet connection and data size.
    Enjoy the migration
    Osama Mustafa






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    Today i received an email for the official publish for Penetration testing tutorial videos , this is another achievement will be added to my security list.

    If you want to have alook on the video here
    Thank you PackIT for this opportunity
    Thank you
    Osama 
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    Are you running Vmware or KVM solution in your infrastructure and you are afraid to move your infrastructure to the cloud, Oracle provide and gives one simple solution without losing anything Now you can now easily move your virtual machines to the Oracle cloud using Ravello

    and you don't have to change anything from network, storage or anything you did on your local infrastructure to know more about this product.

    You can request a free trial account to experience the Ravello’s unique features and
    capabilities. For any questions please contact your local Oracle Cloud Infrastructure and
    Platform Sales Executive. The following is the URL for requesting the Free Trail
    account.

    https://www.ravellosystems.com/.
    Thank you
    Osama 
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    You can use DBaaS Monitor to plug/Unplug in a pluggable database.


    • Open Dbaas Monitor like usual 


    • Once you did this the, you will redirected to new page, in my case i have 2 PDB let's choose one of them and try to unplug it then Plug it again.

    • From the Right Panel press on the Unplug new screen will be open, As you see from the below picture you should the XML path in your mind in case you need to Plug the database again , put the password same as you use it when you create PDB.



    The output should be "PDB unplugged successfully"..


    Let's Plug again.

    • Press on Plug PDB on the right new screen will be opened.




    Enter the following ;-

      • Name of the new PDB You want.
      • The XML file should be saved under directory you choose it



    Output should be successfully done.

    Cheers

    Osama Mustafa






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