IBM DevOps Code ClearCase vs. Mercurial

IBM Rational ClearCase might be better suited for a smaller / simpler code base. Larger code bases really slow it down... but then again there are better alternatives out there for source control

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If you generally think that to develop software you have to choose one repository, then in my opinion you have to choose between Mercurial and Git, there is not other solution. Mercurial also has a good merge tool which i can recommend. This gives you the flexibility to push just the "part of the feature", and is much better suited in the case where the "part of feature" and some other "part of the feature" both contain changes to the same file.

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• Rational ClearCase is excellent for handling versioning and branching. No other tool I've used has the depth that ClearCase has when it comes to handling complex branching scenarios and identifying where certain versions of particular files are within a particular configuration.
• Rational ClearCase handles parallel development of many dependent applications really well.
• The use of ClearCase Views to switch between projects and configurations is extremely convenient as opposed to the local workstation model of the competitors.

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• Branch
• Distributed architecture
• Stable
• Platform independent

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• Extremely buggy.
• Sometimes the repository gets locked for no reason.
• Slow.

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• Integration with visual studio
• More integrated tools
• When I install Mercurial I always have to do a hard restart of my computer.

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If development is centrallized to one location and your company releases hundreds of customized versions of your software per year, then ClearCase is the best tool for managing the complexity of multiple versions of customized software. If your company has globally distributed development, then I'd recommend Team Foundation Server over ClearCase. If your organization uses Agile Methodologies, then I'd recommend TFS with GIT.

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When we chose Mercurial it was more popular from perspectives than Git and we have too many problems with the Microsoft team foundation solution. We also want to move from a centralized version of source control to a distributed one. We also were working more and more via the Internet with our source control so distributed version was only solution.

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• Managed code versioning for many years.
• Only one person can edit code at a time - slows processing down.
• IBM is an expensive product to support.

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• Improve time in merging
• Branching enables us to keep separate version per customer
• Good tool for programmers is sometimes a reason to stay

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A de minimis incentive was given to thank the reviewer for their time. The incentive was not used to bias or drive a particular response, nor was the incentive contingent on a positive endorsement. More Info