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Advantages of Rational ClearCase over other SCM tool i.e Microsoft Visual Source Safe

1. In ClearCase Check-in's are atomic.
2. Directories are first-class controlled entities in 
Clearcase. Even supports controlling of symbolic/hard links.

As with the ClearCase Bridge, you are continuing to use ClearCase for versioning, and are using RTC for change request management, task management, and planning.   With the Clearcase importer (either the Version Importer or the Baseline Importer), you are using RTC for versioning as well, and only using Clearcase for occasional access to archived versioned information that was not imported into RTC. In Clearcase performance is better supports more data size.


VSS Performance is poor and supports less data size.Directories are first-class controlled entities in clearcase. Even supports controlling of symbolic/hard links and The multisite is the best part of clearcase than any other 
tool.

In CLearcase performance is better supports more data size..

VSS Performance is poor and supports less data size.....

how to start the albd_server in windows if it is stopped? #clearcase

u can use below commands in command promt.
c:\>>>> net start albd.

and another way is 
Click Start > Control Panel
Double-click > Administrative Tools folder
Double-click >the Services icon
Double-click >Atria Location Broker service
and start albd.

one more is in conrol panel.there u can see the clearcase 
icon and double click on that icon.
click on services start up.
there u can see the albd status if albd service is stop
start albd service.

The troubleshooting steps below for each error are the culmination of different approaches that have been taken to solve the particular problem. The error is generic but the solutions are specific to the environment from which the problem occurs, therefore the steps below span multiple environments.

How to synchronise two vobs?

First, the ClearCase administrator at the site that has the needed data must create and export a synchronization packet to the site that needs that data. Here is an example of the command that does this action. Keep in mind that this command must be run on the VOB server that hosts the VOB, as the VOB owner, and the destination VOB replica must be known. 
 

/usr/atria/bin/multitool syncreplica –export –nc –fship 
replica:VOB_REPLICA@vob:VOB_TAG

This command will create a synchronization packet file in the outgoing shipping bay; by default, this directory is located here: /usr/atria/shipping/ms_ship/outgoing/. Then this synchronization packet will be shipped to the remote replica's VOB server, and then the packet file will be deleted. 

If the Vob is already replicated (meaning with ClearCase multisite), then it mostly is a matter of running multitool syncreplica: host1: multitool syncreplica -export -fship replica:@\aPVob host2: cd /opt/rational/clearcase/shipping/ms_ship/incoming sudo -u vobadm /opt/rational/clearcase/bin/multitool syncreplica -import /opt/rational/clearcase/shipping/ms_ship/incoming/sync_*_2015-07-16T07*

How to register a View in clear case

When you create or update a snapshot view or click a view shortcut in Rational ClearCase Explorer, the snapshot view is registered in your computer registry. The Rational ClearCase integration with Windows Explorer (running in Rational ClearCase Explorer and Windows Explorer) recognizes as Rational ClearCase objects files and directories below a registered snapshot view. If a snapshot view is not registered on your computer and you access files and directories under the view root directory through Network Neighborhood, the Rational ClearCase integration with Windows Explorer does not recognize the files or directories as Rational ClearCase objects. For example, if you use Windows Explorer to navigate to a team member's snapshot view on a different computer and right-click a file in the view, Rational ClearCase options are not available. Also, if you try to perform Rational ClearCase operations from an unregistered snapshot view, the view cannot be found.

When you create a snapshot view, it is registered in the file .ccase_svreg in your home directory. When a snapshot view needs to be accessed, that file in your home directory is searched to find the path for the snapshot view root directory. If you did not create or have not updated the view that is being accessed, you must explicitly register the view.

What are Dynamic views? #Clearcase

To use a ClearCase dynamic view in the Rational ClearTeam Explorer:

  1. In the ClearTeam Navigator, create a new view by selecting ClearCase -> Create View or join a ClearCase UCM project by selecting ClearCase -> Join Project.
  2. If you are creating a new view, specify the View Type as Dynamic on the Create a ClearCase view page. If you are joining a ClearCase UCM project, in the Join Project wizard, specify the View Type as Web on the Set up a ClearCase UCM development environment page.
  3. Finish the process of creating a new ClearCase view or joining a ClearCase UCM project.

Dynamic views are based on network content: they represent the dynamic (as in "always refreshed") view of a network content (the remote VOB versions selected by the config spec).Dynamic views are great for quickly testing config specs, but accessing many files from the dynamic view is slow. And if you are trying to access them via ssh for rsync for example you run into many permission and other problems.

What is a clearcase trigger and How to apply them?

There are two general categories of ClearCase triggers:

  • Preoperation triggers fire before the designated ClearCase command is executed. For example, preoperation trigger on checkin can prompt you to add an appropriate comment.
  • Postoperation triggers fire after a ClearCase operation has completed and can take advantage of the operation's completion status. For example, a postoperation trigger on checkin can send an e-mail message indicating that a particular developer modified a particular element.

ClearCase is a big, complex and powerful tool.  It is likely that a smaller lighter weight tool (eg: CVSNT, Perforce, TeamSystem) could save your organization a lot of money and make developers lives much easier - but you'll only get it through such a big organization by learning who the stakeholders are, and LISTENING TO THEM about what THEY need CM to deliver.

 All the triggers described in this document are delivered "as is." There is no official support offered by IBM for these scripts and triggers.Also, as described in the ClearCase manual, triggers are always launched on the client computer, using the identity of the user who initiated the ClearCase command.All my triggers were developed in one of three languages: either directly as shell / batch, in Perl, or using the ClearCase API (CAL).I am not a Perl expert, and you will immediately see that my Perl language knowledge is limited, but hopefully these scripts are easy to understand. Nor am I a Visual Basic expert, and after looking over my VB programs you may get the feeling that they could be rewritten in a more optimized way.In any case, feel free to contact me with either your comments or suggestions for improvements that you would like to see in these scripts.

What is the advantage of IBMs Rational Clearcase over other source control tools available ?

File-centric operations Centralized VCS Expensive Distributed VCS option Old and not user-friendly GUI
  1. In Clearcase performance is better supports more data size..
  2. VSS Performance is poor and supports less data size....
  3.  In Clearcase Check-in's are atomic.
  4.  Directories are first-class controlled entities in Clearcase. Even supports controlling of symbolic/hard links.

what is eclipsed file in clearcase? What is the solution? In what case it is called eclipsed file?

The definition of a ClearCase eclipse: 
A VOB object that is not visible because another object with the same name is currently selected 

A VOB object that is not visible because another object with the same name is currently selected by the view. 

Eclipsed elements 
 The objects that become eclipsed most frequently are elements. An eclipsed element is created when it is obscured by a view-private file.

How to restart clearcase services and processes?

Stop ClearCase from Command Line 

To stop the ALBD, Lock Manager, and Credentials Manager services, issue the following commands individually: 

NET STOP ALBD

NET STOP LOCKMGR

NET STOP CCCREDMGR 
 



Start ClearCase from Command Line 

To start the ALBD, LOCKMGR, and CCCREDMGR services, issue the following commands: 

NET START ALBD

NET START LOCKMGR

NET START CCCREDMGR 

Rational® ClearCase® is a distributed application. Many of its operations involve several host computers and several server processes on each host.

These servers do not usually need to be explicitly configured, started, stopped, or managed. The information in these topics is intended to help you understand status and error messages that these servers generate, to access server logs, and to understand the role each server process plays in a Rational ClearCase network.

Two server processes— albd_server and admin_server—run on every host that has been configured to support local VOBs and views, regardless of whether any VOBs or views have been created on the host. Other server processes are started as necessary to manage any VOBs and views that reside on the host.

What is virtual file system in clearcase?

MVFS (Multi-Version Filesystem) don't so much "create" a filesystem, but give you access to one.

M: (on Windows) or /view (on Unix) is a mounting point allowing to browse the content of any Vob (the ClearCase repositories) you mount (like a classic network mount, but made by ClearCase).

When you create a dynamic view, you will use MVFS to browse the "dynamic" filesystem, meaning you want load any file on your hard disk: you will remotely see any version you have selected through the config spec of the view.

The MVFS extends the host’s native operating system to provide file system support for dynamic views. A dynamic view is an MVFS directory that enables dynamic access to VOB elements. Dynamic views use the MVFS to present a selected combination of local and remote files as if they were stored in the native file system.