select
  ses.osuser,
  ses.sid,
  ses.serial#,
--trx.addr          trx_addr,
--ses.saddr,
  trx.ses_addr,
--This mm/dd/yy is probably the worst possible formats...
  to_char(to_date(trx.start_time, 'mm/dd/yy hh24:mi:ss'), 'dd.mm.yyyy hh24:mi:ss') start_time,
  trx.used_ublk,
  trx.used_urec
from
  v$session     ses join
--v$transaction trx on ses.taddr = trx.addr
  v$transaction trx on ses.saddr = trx.ses_addr;