Hi Baziel, I think the problem here is a column overflow as sometimes happens with for example the statistic "redo size" in v$sesstat, when the number are getting really big, above 4294967296 (32 bit border), the number wents to negative. Regards, Gerwin 2010/10/6 Baziel de Leeuw <baziel@xxxxxxxxxx> > Hi, > > What does the statistic_name='space used' column in v$segment_statistics > show? > > I get results i don't understand at all, e.g. > > SQL> select owner, object_name, statistic_name, value from > v$segment_statistics where owner='SYS' and > object_name='WRI$_OPTSTAT_HISTGRM_HISTORY' and statistic_name='space used'; > > OWNER OBJECT_NAME STATISTIC_NAME > VALUE > ---------- ------------------------------ --------------- > ------------------ > SYS WRI$_OPTSTAT_HISTGRM_HISTORY space used > -554110 > > Yes, that is a negative value. > > I expected beforehand that space_used would be something like bytes in > memory or something like that. > > Does anyone know what it actually is? > > Baziel > > >