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丸趣 TV 小编给大家分享一下 Oracle 中如何找出有哪些索引从来没有被使用过，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！
数据库经过 N 手后，索引乱建，下面的 SQL 就找出一点时间范围内哪些索引从来没被使用过，亲测好用，注意一点，生成的 SQL 你要是执行了，就会从脚本中消失了，
SELECT X.OWNER,
X.TABLE_NAME,
X.INDEX_NAME,
C.COLUMN_POSITION,
C.COLUMN_NAME,
S.BYTES / 1024 / 1024 M,
q [select count(*),count(distinct ] || C.COLUMN_NAME ||
q [) from ] || X.OWNER || . || X.TABLE_NAME || q ] AS QUERY_Q
FROM (SELECT A.OWNER, A.TABLE_NAME, A.INDEX_NAME
FROM DBA_INDEXES A
WHERE A.OWNER IN (SELECT USERNAME
FROM DBA_USERS
WHERE CREATED DATE 2018-10-30 )
AND (A.OWNER, A.INDEX_NAME) NOT IN
(SELECT /*+unnest*/
B.OBJECT_OWNER, B.OBJECT_NAME
FROM GV$SQL A, GV$SQL_PLAN B
WHERE A.SQL_ID = B.SQL_ID
AND A.CHILD_NUMBER = B.CHILD_NUMBER
AND B.OBJECT_OWNER IN
(SELECT USERNAME
FROM DBA_USERS
WHERE CREATED DATE 2018-10-30 )
AND B.OBJECT_TYPE LIKE %INDEX%
AND B.TIMESTAMP DATE 2018-10-10 )
AND A.TABLE_NAME NOT LIKE SYS%
AND A.UNIQUENESS UNIQUE ) X
INNER JOIN DBA_IND_COLUMNS C
ON C.INDEX_OWNER = X.OWNER
AND C.INDEX_NAME = X.INDEX_NAME
AND C.TABLE_NAME = X.TABLE_NAME
INNER JOIN DBA_SEGMENTS S
ON S.SEGMENT_NAME = C.TABLE_NAME
AND S.OWNER = C.INDEX_OWNER
AND S.BYTES / 1024 / 1024 10
ORDER BY 1, 2, 3, 4;以上是“Oracle 中如何找出有哪些索引从来没有被使用过”这篇文章的所有内容，感谢各位的阅读！相信大家都有了一定的了解，希望分享的内容对大家有所帮助，如果还想学习更多知识，欢迎关注丸趣 TV 行业资讯频道！
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