mulgara - semantic store

set

Sets a property in the interpreter. The general syntax is:

set option [on | off];

Where option is one of the following:

• time

  Prints the time a command takes to execute (in seconds). For example:

  set time on ;
  Command timing on
  Command execution time - 0.019 seconds
  alias <http://www.w3.org/1999/02/22-rdf-syntax-ns#> as rdfns ;
  Successfully aliased http://www.w3.org/1999/02/22-rdf-syntax-ns# as rdfns
  Command execution time - 0.0050 seconds
  set time off ;
  Command timing off
  alias <http://www.w3.org/1999/02/22-rdf-syntax-ns#> as rdfns ;
  Successfully aliased http://www.w3.org/1999/02/22-rdf-syntax-ns# as rdfns

• autocommit

  The default setting is on. Setting this option off specifies that all subsequent iTQL^TM commands that modify the database are isolated in a logical unit of work. That is, modifications are not visible to other iTQL sessions until either autocommit is set back on or a commit command is performed. For example:

  set autocommit off ;
  insert <ns:subject> <ns:predicate1> 'object' into <rmi://mysite.com/server1#model> ;
  insert <ns:subject> <ns:predicate2> 'object2' into <rmi://mysite.com/server1#model> ;
  set autocommit on ;

If a session with autocommit set off is idle for a period greater than three minutes, and a second session attempts a write, then a rollback of the first session's uncommitted transactions occurs. The first session's next iTQL command then reports an error indicating that the transactions were lost.