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Union vs Union All in sql server
In this article, I have mentioned what is difference between Union and Union All in SQL Server with example.
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Article
81 1
What difference does checkpointing makes in log based recovery?

This is more of a big data question(GFS related). I'm not getting how checkpointing help? Can you share 1 example(which could be DBMS example).

Say these are the operations on the database.

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Question

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