Oracle 對分區做調整記得加update global indexes

在對分區做ddl操作時，會使分區全局索引失效，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');

執行計劃

----------------------------------------------------------

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'))

統計信息

----------------------------------------------------------

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于不可用狀態

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');

執行計劃

----------------------------------------------------------

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'))

統計信息

----------------------------------------------------------

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;

總結

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