On 11 Sep 2012, at 12:55am, Keith Chew <keith.c...@gmail.com> wrote:
> Durability means a transaction cannot be lost When is a transaction a transaction. Under the definition of ACID a transaction is a transaction as soon is your COMMIT returns with a non-error result code. > , and I know FULL (1) > will provide that. The question is why NORMAL (1) cannot provide the > same. Because NORMAL doesn't flush changes to disk after every single transaction. It queues a few of them up and flushes them all in one go. This makes things far faster because it's the flushing to disk which takes a lot of time. So your payoff equation is this: NORMAL) Faster but if you lose power more transactions are lost, but the database is still not corrupt. FULL) Every COMMIT will take more time, but a power-failure can lose a maximum of one transaction. Just to remind you, all this depends on your hardware supporting ACID. Which almost no hard disks do. Simon. _______________________________________________ sqlite-users mailing list sqlite-users@sqlite.org http://sqlite.org:8080/cgi-bin/mailman/listinfo/sqlite-users
