What is the difference between reserve checkout and un-reserved checkout in clearcase?
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pessimistic": reserved checkout doesn't actually prevent other people to do their own checkout, but they will have to wait for the person who has the file checked out as "reserved" to do the check in: nobody can check-in until that person does the first check-in (then each other user will have to merge his/her version with the latest checked-in file)
Note: a "reserved" checkout can release its lock and be made unreserved, either by the owner or the administrator;
"optimistic": unreserved checkout which means (if nobody use a reserved checkout on the same file): the first one to check-in can do it without any other operation, the other ones will have to merge their work with the latest checked-in file.
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pessimistic": reserved checkout doesn't actually prevent other people to do their own checkout, but they will have to wait for the person who has the file checked out as "reserved" to do the check in: nobody can check-in until that person does the first check-in (then each other user will have to merge his/her version with the latest checked-in file)
Note: a "reserved" checkout can release its lock and be made unreserved, either by the owner or the administrator;
"optimistic": unreserved checkout which means (if nobody use a reserved checkout on the same file): the first one to check-in can do it without any other operation, the other ones will have to merge their work with the latest checked-in file.
HOPE HELPS ✌️✌️
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