快照会话数查询

SELECT A.SNAP_ID,

       TO_CHAR(B.END_INTERVAL_TIME, 'mm-dd_hh34:mi') SNAP_TIME,

       SUM(DECODE(A.STAT_NAME, 'logons current', A.VALUE, 0)) LOGON_CURRENT

  FROM DBA_HIST_SYSSTAT A, DBA_HIST_SNAPSHOT B

 WHERE A.DBID = B.DBID

   AND A.INSTANCE_NUMBER = B.INSTANCE_NUMBER

   AND A.SNAP_ID = B.SNAP_ID

   AND B.END_INTERVAL_TIME >= TRUNC(SYSDATE - 7)

   AND B.END_INTERVAL_TIME <= TRUNC(SYSDATE)

   AND A.STAT_NAME = 'logons current'

 GROUP BY A.SNAP_ID, B.END_INTERVAL_TIME

 ORDER BY 1