oracle索引重建并行,记一次Oracle分区表全局索引重建的过程

1、查询数据库各个表空间利用率：

SELECT Upper(F.TABLESPACE_NAME) "表空间名",

D.TOT_GROOTTE_MB "表空间大小(M)",

D.TOT_GROOTTE_MB - F.TOTAL_BYTES "已使用空间(M)",

To_char(Round((D.TOT_GROOTTE_MB - F.TOTAL_BYTES) / D.TOT_GROOTTE_MB * 100,

2),

'990.99') || '%' "使用比",

F.TOTAL_BYTES "空闲空间(M)",

F.MAX_BYTES "最大块(M)"

FROM (SELECT TABLESPACE_NAME,

Round(Sum(BYTES) / (1024 * 1024), 2) TOTAL_BYTES,

Round(Max(BYTES) / (1024 * 1024), 2) MAX_BYTES

FROM SYS.DBA_FREE_SPACE

GROUP BY TABLESPACE_NAME) F,

(SELECT DD.TABLESPACE_NAME,

Round(Sum(DD.BYTES) / (1024 * 1024), 2) TOT_GROOTTE_MB

FROM SYS.DBA_DATA_FILES DD

GROUP BY DD.TABLESPACE_NAME) D

WHERE D.TABLESPACE_NAME = F.TABLESPACE_NAME

ORDER BY 1;

2、根据表空间名称查询表的大小：

select SEGMENT_NAME, TABLESPACE_NAME,SEGMENT_TYPE, sum(BYTES / 1024 / 1024 ) || 'M'

from dba_segments

where /*SEGMENT_TYPE = 'TABLE'

AND */TABLESPACE_NAME='TEST'

group by SEGMENT_NAME, TABLESPACE_NAME,SEGMENT_TYPE

ORDER BY sum(BYTES / 1024 / 1024) DESC;

3、根据索引查询所属表：

select col.table_owner "table_owner",

idx.table_name "table_name",

col.index_owner "index_owner",

idx.index_name "index_name",

uniqueness "uniqueness",

status,

column_name "column_name",

column_position

from dba_ind_columns col, dba_indexes idx

where col.index_name = idx.index_name

and col.table_name = idx.table_name

and col.table_owner = idx.table_owner

/*and col.table_owner = '&owner'

and col.table_name = '&table_name'*/

and idx.index_name='index1'

order by idx.table_type,

idx.table_name,

idx.index_name,

col.table_owner,

column_position;

4、表索引重建,通过并行方式重建表索引，其中10可以根据Oracle物理机cpu个数更改：

alter index INDEX123456 rebuild online parallel 10;