redo log is used for redo committed transaction after DB crash. However, updates of committed transaction are written to disk when commit. why does DBMS use redo log? What actually a DBMS does when a transaction commits? Thanks!
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Not exactly; Redo is performed on a redoable action only if none of these 3 conditions applies: (quoted straight from Ramakrishnan and Gehrke)
If none of those are true, that basically means the action was successfully commited.