oracle 索引建立小计

SQL> create index idx_test on test(id1)tablespace IDX nologging online parallel 4;Index created.SQL> alter index idx_test noparallel;Index altered.SQL> select degree from dba_indexes where index_name='IDX_TEST';DEGREE----------------------------------------1

在一个24*7的应用上，需要把一个访问量很大的1000万以上数据级别的表的普通索引(a,b)修改成唯一约束(a,b,c)create index idx_test on test(a,b,c) online;alter table test add constraint cons_test unique (a,b,c) using index idx_test;

先移动表的表空间：SQL> alter table test move tablespace LLC;Table altered.再移动索引的表空间：SQL> alter index idx_test rebuild tablespace LLC;Index altered.

查询索引（或者表）在数据文件上的分布：SELECT DISTINCT (b.file_name), a.owner, a.segment_name  FROM dba_extents a, dba_data_files b WHERE a.file_id = b.file_id   AND a.segment_name = 'IDX_LOTHISTORY_MODULEID'   AND a.owner = 'RPT'

重建索引，关注临时表空间的使用：

SELECT round((f.bytes_free + f.bytes_used) / 1024 / 1024, 2) "total MB",       round(((f.bytes_free + f.bytes_used) - nvl(p.bytes_used, 0)) / 1024 / 1024,             2) "Free MB",       d.file_name "Datafile name",       round(nvl(p.bytes_used, 0) / 1024 / 1024, 2) "Used MB",       round((f.bytes_free + f.bytes_used) / 1024, 2) "total KB",       round(((f.bytes_free + f.bytes_used) - nvl(p.bytes_used, 0)) / 1024,             2) "Free KB",       round(nvl(p.bytes_used, 0) / 1024, 2) "Used KB",       0 "Fragmentation Index"  FROM sys.v_$temp_space_header f,       dba_temp_files           d,       sys.v_$temp_extent_pool  p WHERE f.tablespace_name(+) = d.tablespace_name   AND f.file_id(+) = d.file_id   AND p.file_id(+) = d.file_id