Oracle 监控索引使用率脚本分享(2)
a、上面的结果列出了当前数据库中schema为GOEX_ADMIN且索引大小大于100MB的索引的使用频率。 b、由于当前的数据库为标准版，没有分区表功能，所以可以看到
a、上面的结果列出了当前数据库中schema为GOEX_ADMIN且索引大小大于100MB的索引的使用频率。
b、由于当前的数据库为标准版，没有分区表功能，所以可以看到很多arc结尾的表，且索引很大，如ACC_POS_STOCK_TBL_ARC上索引达到19G。
c、表ACC_POS_CASH_PL_TBL_ARC上的主键PK_ACC_POS_CASH_PL_ARCH_TBL上范围扫描最多，总计被使用次数为112次。
d、对于上述列出的被使用的次数为0的那些索引，应考虑索引的设置是否合理。
e、过大的索引应考虑能否使用索引压缩。
f、最后列出的是报告的schema名称以及索引大小的过滤条件、索引被收集的日期。注，索引列的大小sum求和有些不准确。
3、获得索引使用频率脚本
--该脚本作者为Damir Vadas，感谢Damir Vadas的贡献
robin@SZDB:~/dba_scripts/custom/sql> more idx_usage_detail.sql
/* ---------------------------------------------------------------------------
CR/TR# :
Purpose : Shows index usage by execution (find problematic indexes)
Date : 22.01.2008.
Author : Damir Vadas, damir.vadas@gmail.com
Remarks : run as privileged user
Must have AWR run because sql joins data from there
works on 10g >
@index_usage SCHEMA MIN_INDEX_SIZE
Changes (DD.MM.YYYY, Name, CR/TR#):
25.11.2010, Damir Vadas
added index size as parameter
30.11.2010, Damir Vadas
fixed bug in query
--------------------------------------------------------------------------- */
set linesize 140
set pagesize 160
clear breaks
clear computes
break on TABLE_NAME skip 2 ON INDEX_NAME ON INDEX_TYPE ON MB
compute sum of NR_EXEC on TABLE_NAME SKIP 2
compute sum of MB on TABLE_NAME SKIP 2
SET TIMI OFF
set linesize 140
set pagesize 10000
set verify off
col OWNER noprint
col TABLE_NAME for a30 heading 'Table name'
col INDEX_NAME for a30 heading 'Index name'
col INDEX_TYPE for a15 heading 'Index type'
col INDEX_OPERATION for a21 Heading 'Index operation'
col NR_EXEC for 9G999G990 heading 'Executions'
col MB for 999G990D90 Heading 'Index|Size MB' justify right
WITH Q AS (
SELECT
S.OWNER A_OWNER,
TABLE_NAME A_TABLE_NAME,
INDEX_NAME A_INDEX_NAME,
INDEX_TYPE A_INDEX_TYPE,
SUM(S.bytes) / 1048576 A_MB
FROM DBA_SEGMENTS S,
DBA_INDEXES I
WHERE S.OWNER = '&&1'
AND I.OWNER = '&&1'
AND INDEX_NAME = SEGMENT_NAME
GROUP BY S.OWNER, TABLE_NAME, INDEX_NAME, INDEX_TYPE
HAVING SUM(S.BYTES) > 1048576 * &&2
)
SELECT /*+ NO_QUERY_TRANSFORMATION(S) */
A_OWNER OWNER,
A_TABLE_NAME TABLE_NAME,
A_INDEX_NAME INDEX_NAME,
A_INDEX_TYPE INDEX_TYPE,
A_MB MB,
DECODE (OPTIONS, null, ' -',OPTIONS) INDEX_OPERATION,
COUNT(OPERATION) NR_EXEC
FROM Q,
DBA_HIST_SQL_PLAN d
WHERE
D.OBJECT_OWNER(+)= q.A_OWNER AND
D.OBJECT_NAME(+) = q.A_INDEX_NAME
GROUP BY
A_OWNER,
A_TABLE_NAME,
A_INDEX_NAME,
A_INDEX_TYPE,
A_MB,
DECODE (OPTIONS, null, ' -',OPTIONS)
ORDER BY
A_OWNER,
A_TABLE_NAME,
A_INDEX_NAME,
A_INDEX_TYPE,
A_MB DESC,
NR_EXEC DESC
;
PROMPT "Showed only indexes in &&1 schema whose size > &&2 MB in period:"
SET HEAD OFF;
select to_char (min(BEGIN_INTERVAL_TIME), 'DD.MM.YYYY')
|| '-' ||
to_char (max(END_INTERVAL_TIME), 'DD.MM.YYYY')
from dba_hist_snapshot;
SET HEAD ON
SET TIMI ON
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