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C20.0046: Database Management Systems Lecture #1 - page 18 / 40

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M.P. Johnson, DBMS, Stern/NYU, Sp2004

18

Isolation

Concurrent execution is essential for performance.

Frequent, slow disk accesses

don’t waste CPU – keep running

Interleaving actions of different user programs

can lead to inconsistency:

e.g., two programs simultaneously withdraw from the same account

DBMS ensures such problems don’t arise:

users can pretend they are using a single-user system.

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