標籤：
在對分區做ddl操作時，會使分區全域索引失效，需要加上關鍵字update global indexes。
SQL> select * from v$version;
BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
PL/SQL Release 11.2.0.1.0 - Production
CORE 11.2.0.1.0 Production
TNS for 32-bit Windows: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production
drop table t_range purge;
create table t_range (id number not null PRIMARY KEY, test_date date)
partition by range (test_date)
(
partition p_2014_11 values less than (to_date(‘2014-11-01‘, ‘yyyy-mm-dd‘)),
partition p_2014_12 values less than (to_date(‘2014-12-01‘, ‘yyyy-mm-dd‘)),
partition p_2015_01 values less than (to_date(‘2015-01-01‘, ‘yyyy-mm-dd‘)),
partition p_2015_02 values less than (to_date(‘2015-02-01‘, ‘yyyy-mm-dd‘)),
partition p_2015_03 values less than (to_date(‘2015-03-01‘, ‘yyyy-mm-dd‘))
);
insert /*+append */ into t_range select rownum,
to_date(to_char(sysdate - 140, ‘J‘) +
trunc(dbms_random.value(0, 80)),
‘J‘)
from dual
connect by rownum <= 100000;
create index ind_t_range_date on t_range(test_date) nologging;
select * from t_range;
exec dbms_stats.gather_table_stats(user,‘t_range‘,cascade => true);
set autotrace traceonly
select /*+index(t_range ind_t_range_date)*/count(1) from t_range where
test_date = TO_DATE(‘2015-01-01 00:00:00‘, ‘yyyy-mm-dd hh24:mi:ss‘);
執行計畫
----------------------------------------------------------
Plan hash value: 2542800765
--------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 8 | 23 (0)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | 8 | | |
|* 2 | INDEX RANGE SCAN| IND_T_RANGE_DATE | 1243 | 9944 | 23 (0)| 00:00:01 |
--------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - access("TEST_DATE"=TO_DATE(‘ 2015-01-01 00:00:00‘, ‘syyyy-mm-dd hh24:mi:ss‘))
統計資訊
----------------------------------------------------------
1 recursive calls
0 db block gets
6 consistent gets
0 physical reads
0 redo size
424 bytes sent via SQL*Net to client
415 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
set autotrace off
alter table t_range drop partition p_2014_11;
set autotrace traceonly
select /*+index(t_range ind_t_range_date)*/count(1) from t_range where
test_date = TO_DATE(‘2015-01-01 00:00:00‘, ‘yyyy-mm-dd hh24:mi:ss‘);
select /*+index(t_range ind_t_range_date)*/count(1) from t_range where
*
第 1 行出現錯誤:
ORA-01502: 索引 ‘TEST.IND_T_RANGE_DATE‘ 或這類索引的分區處於不可用狀態
set autotrace off;
alter index ind_t_range_date rebuild nologging;
alter table t_range drop partition p_2014_12
update global indexes;
set autotrace traceonly
select /*+index(t_range ind_t_range_date)*/count(1) from t_range where
test_date = TO_DATE(‘2015-01-01 00:00:00‘, ‘yyyy-mm-dd hh24:mi:ss‘);
執行計畫
----------------------------------------------------------
Plan hash value: 2542800765
--------------------------------------------------------------------------------------
| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |
--------------------------------------------------------------------------------------
| 0 | SELECT STATEMENT | | 1 | 8 | 13 (0)| 00:00:01 |
| 1 | SORT AGGREGATE | | 1 | 8 | | |
|* 2 | INDEX RANGE SCAN| IND_T_RANGE_DATE | 1243 | 9944 | 13 (0)| 00:00:01 |
--------------------------------------------------------------------------------------
Predicate Information (identified by operation id):
---------------------------------------------------
2 - access("TEST_DATE"=TO_DATE(‘ 2015-01-01 00:00:00‘, ‘syyyy-mm-dd hh24:mi:ss‘))
統計資訊
----------------------------------------------------------
1 recursive calls
0 db block gets
6 consistent gets
0 physical reads
0 redo size
424 bytes sent via SQL*Net to client
415 bytes received via SQL*Net from client
2 SQL*Net roundtrips to/from client
0 sorts (memory)
0 sorts (disk)
1 rows processed
set autotrace off;
Oracle 對分區做調整記得加update global indexes
