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Checkpointing in dbms

In general in a relational database a checkpoint is a point in time to which the database engine can recover after a crash as a baseline point from which transaction log records can be used to recover all committed data up to the point of the crash. As you can see from my description below and other answers, the mechanisms of a checkpoint and recovery after a crash differ from one RDBMS to another. Informix, as an example, supports two types of checkpoint.

Distribusi lognormal

In probability theory , a log-normal or lognormal distribution is a continuous probability distribution of a random variable whose logarithm is normally distributed. A random variable which is log-normally distributed takes only positive real values.


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