Oracle 查看性能 sql

1.执行最慢

select *
 from (select sa.SQL_TEXT,
        sa.SQL_FULLTEXT,
        sa.EXECUTIONS "执行次数",
        round(sa.ELAPSED_TIME / 1000000, 2) "总执行时间",
        round(sa.ELAPSED_TIME / 1000000 / sa.EXECUTIONS, 2) "平均执行时间",
        sa.COMMAND_TYPE,
        sa.PARSING_USER_ID "用户ID",
        u.username "用户名",
        sa.HASH_VALUE
     from v$sqlarea sa
     left join all_users u
      on sa.PARSING_USER_ID = u.user_id
     where sa.EXECUTIONS > 0
     order by (sa.ELAPSED_TIME / sa.EXECUTIONS) desc)
 where rownum <= 50;

2.查询次数最多

select *
 from (select s.SQL_TEXT,
        s.EXECUTIONS "执行次数",
        u.username "用户名",
        rank() over(order by EXECUTIONS desc) EXEC_RANK
     from v$sql s
     left join all_users u
      on u.USER_ID = s.PARSING_USER_ID) t
 where exec_rank <= 100;

3.总消耗时间最多

select *
from (select v.sql_id,
v.child_number,
v.sql_text,
last_load_time,
v.PARSING_USER_ID,
ROUND(v.ELAPSED_TIME / 1000000 / (CASE
               WHEN (EXECUTIONS = 0 OR NVL(EXECUTIONS, 1 ) = 1) THEN
                1
               ELSE
                EXECUTIONS
             END),
             2) "执行时间'S'",
 v.SQL_FULLTEXT,
v.cpu_time,
v.disk_reads,
rank() over(order by v.elapsed_time desc) elapsed_rank
from v$sql v  ) a
where elapsed_rank <= 100  and   last_load_time > to_char(sysdate - 1/24, 'YYYY-MM-DD/HH:MI:SS')    order by "执行时间'S'" desc

4.最近一小时内最慢

select executions, cpu_time/1e6 as cpu_sec, elapsed_time/1e6 as elapsed_sec, round(elapsed_time/sqrt(executions)) as important, v.* 
from v$sql v 
where executions > 10 and last_load_time > to_char(sysdate - 1/24, 'YYYY-MM-DD/HH:MI:SS')  
order by important desc

5.CPU消耗时间最多

select *
from (select v.sql_id,
v.child_number,
v.sql_text,
v.elapsed_time,
v.cpu_time,
v.disk_reads,
rank() over(order by v.cpu_time desc) elapsed_rank
from v$sql v) a
where elapsed_rank <= 10;

6.消耗磁盘读取最多

select *
from (select v.sql_id,
v.child_number,
v.sql_text,
v.elapsed_time,
v.cpu_time,
v.disk_reads,
rank() over(order by v.disk_reads desc) elapsed_rank
from v$sql v) a
where elapsed_rank <= 10;

7.最近一分钟内最消耗CPU

SELECT ASH.INST_ID,
        ASH.SQL_ID,
        (SELECT VS.SQL_TEXT
           FROM GV$SQLAREA VS
          WHERE VS.SQL_ID = ASH.SQL_ID
            AND ASH.INST_ID = VS.INST_ID) SQL_TEXT,
        ASH.SQL_CHILD_NUMBER,
        ASH.SQL_OPNAME,
        ASH.SESSION_INFO,
        COUNTS,
        PCTLOAD * 100 || '%' PCTLOAD
   FROM (SELECT ASH.INST_ID,
                ASH.SQL_ID,
                ASH.SQL_CHILD_NUMBER,
                ASH.SQL_OPNAME,
                (ASH.MODULE || '--' || ASH.ACTION || '--' || ASH.PROGRAM || '--' ||
                ASH.MACHINE || '--' || ASH.CLIENT_ID || '--' ||
                ASH.SESSION_TYPE) SESSION_INFO,
                COUNT(*) COUNTS,
                ROUND(COUNT(*) / SUM(COUNT(*)) OVER(), 2) PCTLOAD,
                DENSE_RANK() OVER(ORDER BY COUNT(*) DESC) RANK_ORDER
           FROM GV$ACTIVE_SESSION_HISTORY ASH
          WHERE  ASH.SESSION_TYPE <> 'BACKGROUND'
           AND ASH.SESSION_STATE = 'ON CPU'
AND SAMPLE_TIME > SYSDATE - 1 / (24 * 60)
          GROUP BY ASH.INST_ID,
                   ASH.SQL_ID,
                   ASH.SQL_CHILD_NUMBER,
                   ASH.SQL_OPNAME,
                   (ASH.MODULE || '--' || ASH.ACTION || '--' || ASH.PROGRAM || '--' ||
                   ASH.MACHINE || '--' || ASH.CLIENT_ID || '--' ||
                   ASH.SESSION_TYPE)) ASH
  WHERE RANK_ORDER <= 10
  ORDER BY COUNTS DESC;

8.最近一分钟内最消耗CPU的会话

SELECT SESSION_ID,
       COUNT(*)
FROM   V$ACTIVE_SESSION_HISTORY V
WHERE  V.SESSION_STATE = 'ON CPU'
AND    V.SAMPLE_TIME > SYSDATE - 10/ (24 * 60)
GROUP  BY SESSION_ID
ORDER  BY COUNT(*) DESC;

9.最近一分钟内最消耗I/O

SELECT ASH.INST_ID,
        ASH.SQL_ID,
        (SELECT VS.SQL_TEXT
           FROM GV$SQLAREA VS
          WHERE VS.SQL_ID = ASH.SQL_ID
            AND ASH.INST_ID = VS.INST_ID) SQL_TEXT,
        ASH.SQL_CHILD_NUMBER,
        ASH.SQL_OPNAME,
        ASH.SESSION_INFO,
        COUNTS,
        PCTLOAD * 100 || '%' PCTLOAD
   FROM (SELECT ASH.INST_ID,
                ASH.SQL_ID,
                ASH.SQL_CHILD_NUMBER,
                ASH.SQL_OPNAME,
                (ASH.MODULE || '--' || ASH.ACTION || '--' || ASH.PROGRAM || '--' ||
                ASH.MACHINE || '--' || ASH.CLIENT_ID || '--' ||
                ASH.SESSION_TYPE) SESSION_INFO,
                COUNT(*) COUNTS,
                ROUND(COUNT(*) / SUM(COUNT(*)) OVER(), 2) PCTLOAD,
                DENSE_RANK() OVER(ORDER BY COUNT(*) DESC) RANK_ORDER
           FROM GV$ACTIVE_SESSION_HISTORY ASH
          WHERE ASH.SESSION_TYPE <> 'BACKGROUND'
            AND ASH.SESSION_STATE = 'WAITING'
            AND ASH.SAMPLE_TIME > SYSDATE - 1 / (24 * 60)
            AND ASH.WAIT_CLASS = 'USER I/O'
          GROUP BY ASH.INST_ID,
                   ASH.SQL_ID,
                   ASH.SQL_CHILD_NUMBER,
                   ASH.SQL_OPNAME,
                   (ASH.MODULE || '--' || ASH.ACTION || '--' || ASH.PROGRAM || '--' ||
                   ASH.MACHINE || '--' || ASH.CLIENT_ID || '--' ||
                   ASH.SESSION_TYPE)) ASH
  WHERE RANK_ORDER <= 10
  ORDER BY COUNTS DESC;