Oracle之索引监控脚本大全
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select table_name, count(*) cnt
from user_indexes
group by table_name
having count(*) >= 5
order by cnt desc ;
2.当前用户下,哪些组合索引组合列超过4个的
select table_name, index_name, count(*)
from user_ind_columns
group by table_name, index_name
having count(*) >= 4
order by count(*) desc;
3.--当前用户下,哪些索引的聚合因子特别大。数据越大说明聚合因子数量多
select a.table_name,
a.index_name,
a.blevel,
a.leaf_blocks,
b.num_rows,
b.blocks,
a.clustering_factor,
trunc(a.clustering_factor / b.num_rows,2) cluster_rate
from user_indexes a, user_tables b
where a.table_name = b.table_name
and b.num_rows!=0--有待考究!(自己加的)
and a.clustering_factor is not null
and a.clustering_factor / b.num_rows>0.9
order by cluster_rate desc ;
4.当前用户下,哪些表的组合索引与单列索引存在交叉的情况。(个人感觉统计有问题有待考究)
重复率
select table_name, trunc(count(distinct(column_name)) / count(*),2) cross_idx_rate
from user_ind_columns
group by table_name
having count(distinct(column_name)) / count(*) < 1
order by cross_idx_rate desc;
---------例子
drop table t purge;
drop table t1 purge;
create table t1 as select * from dba_objects where object_id is not null;
create index idx_t1_objid_owner on t1(object_id ,owner);
create index idx_t1_object_id on t1(object_id );
drop table t2 purge;
create table t2 as select * from dba_objects where object_id is not null;
create index idx_t2_objid_owner on t2(object_id,owner);
create index idx_t2_object_id on t2(object_id);
create index idx_t2_owner on t2(owner);
drop table t3 purge;
create table t3 as select * from dba_objects where object_id is not null;
create index idx_t3_objid_owner on t3(object_id,owner);
create index idx_t3_owner_objid on t3(owner,object_id);
create index idx_t3_object_id on t3(object_id);
create index idx_t3_owner on t3(owner);
---执行如下语句,发现当前用户下,T3,T2,T1表存在索引单列组合有交叉,最严重的是T3
select table_name, trunc(count(distinct(column_name)) / count(*),2) cross_idx_rate
from user_ind_columns
group by table_name
having count(distinct(column_name)) / count(*) < 1
order by cross_idx_rate ;
TABLE_NAME CROSS_IDX_RATE
------------------------------ --------------
T3 .33
T2 .5
T1 .66
5.失效-普通索引
select t.index_name,
t.table_name,
blevel,
t.num_rows,
t.leaf_blocks,
t.distinct_keys
from user_indexes t
where status = 'UNUSABLE' ;
6.失效-分区索引
select t1.blevel,
t1.leaf_blocks,
t1.INDEX_NAME,
t2.table_name,
t1.PARTITION_NAME,
t1.STATUS
from user_ind_partitions t1, user_indexes t2
where t1.index_name = t2.index_name
and t1.STATUS = 'UNUSABLE';
7.哪些数据大表没有建索引
--针对普通表(大于2GB的表未建任何索引)
select segment_name, bytes/1024/1024/1024 "GB", blocks, tablespace_name
from user_segments
where segment_type = 'TABLE'
and segment_name not in (select table_name from user_indexes)
and bytes / 1024 / 1024 / 1024 >= 2
order by GB desc;
--针对分区表(大于2GB的分区表未建任何索引)
--无论是建了局部索引还是全局索引,在user_indexes都可以查到,只是status不一样。
select segment_name, sum(bytes)/1024/1024/1024 "GB", sum(blocks)
from user_segments
where segment_type = 'TABLE PARTITION'
and segment_name not in (select table_name from user_indexes)
group by segment_name
having sum(bytes)/1024/1024/1024>=2
order by GB desc;
--注:无论是建了局部索引还是全局索引,在user_indexes都可以查到,只是status不一样。
8.将外键未建索引的情况列出
select table_name,
constraint_name,
cname1 || nvl2(cname2, ',' || cname2, null) ||
nvl2(cname3, ',' || cname3, null) ||
nvl2(cname4, ',' || cname4, null) ||
nvl2(cname5, ',' || cname5, null) ||
nvl2(cname6, ',' || cname6, null) ||
nvl2(cname7, ',' || cname7, null) ||
nvl2(cname8, ',' || cname8, null) columns
from (select b.table_name,
b.constraint_name,
max(decode(position, 1, column_name, null)) cname1,
max(decode(position, 2, column_name, null)) cname2,
max(decode(position, 3, column_name, null)) cname3,
max(decode(position, 4, column_name, null)) cname4,
max(decode(position, 5, column_name, null)) cname5,
max(decode(position, 6, column_name, null)) cname6,
max(decode(position, 7, column_name, null)) cname7,
max(decode(position, 8, column_name, null)) cname8,
count(*) col_cnt
from (select substr(table_name, 1, 30) table_name,
substr(constraint_name, 1, 30) constraint_name,
substr(column_name, 1, 30) column_name,
position
from user_cons_columns) a,
user_constraints b
where a.constraint_name = b.constraint_name
and b.constraint_type = 'R'
group by b.table_name, b.constraint_name) cons
where col_cnt > ALL
(select count(*)
from user_ind_columns i
where i.table_name = cons.table_name
and i.column_name in (cname1, cname2, cname3, cname4, cname5,
cname6, cname7, cname8)
and i.column_position <= cons.col_cnt
group by i.index_name);
9.当前用户下,哪些索引的高度比较高,大于5层(LEVEL=4)
select table_name,
index_name,
blevel,
leaf_blocks,
num_rows,
last_analyzed,
degree,
status
from user_indexes
where blevel>=4;
10.当前用户下,哪些外键的约束失效了。
SELECT TABLE_NAME,
CONSTRAINT_NAME,
STATUS,
CONSTRAINT_TYPE,
R_CONSTRAINT_NAME
FROM USER_CONSTRAINTS
WHERE STATUS='DISABLED';
11.当前用户下,哪些索引被设置了并行。
select table_name,
index_name,
blevel,
leaf_blocks,
num_rows,
last_analyzed,
degree,
status
from user_indexes
where degree>1;
12.--普通索引(从未收集过统计信息或者是最近10天内未收集过统计信息的表)
select index_name, table_name, last_analyzed, num_rows, temporary, status
from user_indexes
where status <> 'N/A'
and (last_analyzed is null or last_analyzed < sysdate - 10);
--分区索引(从未收集过统计信息或者是最近10天内未收集过统计信息的分区)
select t2.table_name,
t1.INDEX_NAME,
t1.PARTITION_NAME,
t1.last_analyzed,
t1.blevel,
t1.leaf_blocks,
t1.STATUS
from user_ind_partitions t1, user_indexes t2
where t1.index_name = t2.index_name
and (t1.last_analyzed is null or t1.last_analyzed < sysdate - 10);
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