- begin: There is a transaction. Any
updates have to be kept private until the commit succeeds.
- where ...: A query. What is the
fastest way to find qualifying rows?
- update: Rows that have been read
will be updated. (There may be 0, 1 or 2 rows updated.)
- commit: Guarantee ACID properties.
- Is the state of the database correct?
(Consistent)
- Are there reads or writes that are incompatible
with the transaction's isolation level? If so, abort
the transaction — discard all updates.
(Isolated)
- Write the row updates to disk.
(Durable)
- Make all of the updates public.
(Atomic)