Save changes (transactional).
  
  Syntax:
COMMIT [WORK] [COMMENT 'comment_text'] COMMIT [WORK] [FORCE 'force_text' [,int] ]
FORCE - will manually commit an in-doubt distributed 
  transaction
  force_text - transaction identifier (see the DBA_2PC_PENDING 
  view)
  int - sets a specific SCN
  
  If a network or machine failure prevents a distributed transaction from committing 
  properly, Oracle will store any commit comment in the data dictionary along 
  with the transaction ID.
Commit comments will be deprecated in a future version of Oracle.
Oracle strongly recommends that you use transaction names:   SET TRANSACTION … NAME 
“The difference between eggs and bacon: the chicken is involved, the pig is committed” - Anon
Related Oracle Commands:
LOCK TABLE
SAVEPOINT - Save changes to a point
ROLLBACK - undo changes 
SET TRANSACTION
Related Views:
DBA_2PC_PENDING V$TRANSACTION V$TRANSACTION_ENQUEUE