oracle巡检脚本备份

重做日志生成情况，一天生成日志大小：select round(sum(blocks*block_size)/1024/1024/1024,2) BLOCK from v$archived_log where completion_time<sysdate-1;

 日志切换频率

alter session set nls_date_format='yyyy-mm-dd hh24:mi:ss';
SELECT sum(MINATES)/count(*) TIMES FROM (SELECT B.RECID,
B.FIRST_TIME,
A.FIRST_TIME LAST_TIME,
ROUND((A.FIRST_TIME - B.FIRST_TIME) * 24 * 60, 2) MINATES
FROM V$LOG_HISTORY A, V$LOG_HISTORY B
WHERE A.RECID = B.RECID + 1
ORDER BY A.FIRST_TIME DESC)
WHERE ROWNUM < 120;

非空闲等待事件：select count(sid) NUM from v$session_wait where event not in (select name from v$event_name where wait_class='Idle');