SET-AUTOCOMMIT — Turn on or off autocommit for a database.
Function
valueA Boolean specifying the desired autocommit
            behaviour for database.
            
databaseA database object. This will default to the value of *default-database*.
resultThe previous autocommit value for
            database.
            
Turns autocommit off for database
      if value is NIL, and otherwise turns it
      on. Returns the old value of autocommit flag.
      
For RDBMS (such as Oracle) which don't automatically commit changes, turning autocommit on has the effect of explicitly committing changes made whenever SQL statements are executed.
Autocommit is turned on by default.