X hits on this document

Powerpoint document

C20.0046: Database Management Systems Lecture #1 - page 17 / 40

128 views

0 shares

0 downloads

0 comments

17 / 40

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

17

Atomicity & Durability

Saw how George lost $100 with makeshift DBMS

DBMS prevents this outcome

xacts are all or nothing

One idea: Keep a log (history) of all actions in set of xacts

Durability: Use log to redo or undo certain ops in crash recovery

Atomicity: don’t really commit changes until end

Then, all at once

Document info
Document views128
Page views128
Page last viewedTue Jan 17 16:05:56 UTC 2017
Pages40
Paragraphs688
Words2138

Comments