前台反应响应时间很长,
首先，看看Oracle正在做些什么。
找到问题SQL的sql_id，然后查看执行计划
分析这个SQL
执行顺序应该是 8,7,6,5,4,9,3,10,2,1,0
关于执行计划顺序的纠正:
参考:
http://www.askmaclean.com/archives/read-sql-execution-plan.html
首先，看看Oracle正在做些什么。
-
SELECT a.username, b.sql_id, b.SQL_TEXT, b.SQL_FULLTEXT
-
FROM v$session a, v$sqlarea b
-
WHERE a.sql_address = b.address
- AND a.SQL_HASH_VALUE = b.HASH_VALUE
- select * from table(dbms_xplan.display_awr('2k55nnc3y1xw4'));
分析这个SQL
执行顺序应该是 8,7,6,5,4,9,3,10,2,1,0
-
SELECT opus_type, a.opus_id, opus_name, a.userid, nickname
-
, performer, visit_num,
-
to_char(a.createtime, 'yyyy-mm-dd') AS createtime,
-
file_domain, upload_domain
-
, file_url, round(file_size / 1024000, 2) AS file_size
-
FROM (
-
SELECT rid
-
FROM (
-
SELECT rownum AS rn, rid
-
FROM (
-
SELECT rowid AS rid
-
FROM music_video a
-
WHERE 1 = 1
-
AND opus_stat = 1
-
AND auditing = 1
-
AND convert_mark = 1
-
ORDER BY a.createtime DESC
-
)
-
WHERE rownum <= :1
-
)
-
WHERE rn >= :2
-
) t, music_video a, space_user b
-
WHERE t.rid = a.ROWID
-
AND a.userid = b.userid
- ORDER BY a.createtime DESC
参考:
http://www.askmaclean.com/archives/read-sql-execution-plan.html
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