Raj At least on Linux (but probably everywhere *nix) the times come from the gettimeofday system call. Last time I looked on Windows it was time since last boot (but that was no later than 9i and might have been 8i). gettimeofday should be documented but from memory is Jan 1 1970 On Aug 22, 2013 1:50 PM, "rjamya" <rjamya@xxxxxxxxx> wrote: > Anyone know how/from where this value is sourced? is it from v$timer? it is > time in microseconds since when? > Plus i suspect it is platform dependent ... > Thanks for your answers in advance > Raj > > > -- > //www.freelists.org/webpage/oracle-l > > > -- //www.freelists.org/webpage/oracle-l