说明

本文将包含如下内容：

ORACLE 19.5 测试ALTER TABLE ... MODIFY转换非分区表为分区表

创建测试表

CREATE TABLE TEST_MODIFY(ID NUMBER,NAME VARCHAR2(30),STATUS VARCHAR2(10));

插入30万数据

declare
v1 number;
begin
for i in 1..300000
loop
execute immediate 'insert into test_modify values(:v1,''czh'',''Y'')' using i;
end loop;
commit;
end;
/

添加主键约束与索引

ALTER TABLE TEST_MODIFY ADD CONSTRAINT PK_TEST_MODIFY PRIMARY KEY(ID);
CREATE INDEX IDX_TEST_MODIFY ON TEST_MODIFY(CASE STATUS WHEN 'N' THEN 'N' END);

收集统计信息

exec dbms_stats.gather_table_stats(OWNNAME=>'CZH',TABNAME=>'TEST_MODIFY',cascade=>TRUE);

查询索引状态

14:56:06 CZH@czhpdb > select INDEX_NAME,NUM_ROWS,LEAF_BLOCKS,status from user_indexes where index_name in ('IDX_TEST_MODIFY','PK_TEST_MODIFY');
INDEX_NAME                                           NUM_ROWS                              LEAF_BLOCKS STATUS
-------------------- ---------------------------------------- ---------------------------------------- ----------
IDX_TEST_MODIFY                                             0                                        0 VALID
PK_TEST_MODIFY                                         300000                                      626 VALID

转换ALTER TABLE ... MODIFY

ALTER TABLE TEST_MODIFY MODIFY
PARTITION BY RANGE (ID)
( PARTITION P1 VALUES LESS THAN (100000),
PARTITION P2 VALUES LESS THAN (200000),
PARTITION P3 values less than (maxvalue)
) ONLINE
UPDATE INDEXES;

查询索引状态

14:57:11 CZH@czhpdb > select INDEX_NAME,NUM_ROWS,LEAF_BLOCKS,status from user_indexes where index_name in ('IDX_TEST_MODIFY','PK_TEST_MODIFY');
INDEX_NAME                                           NUM_ROWS                              LEAF_BLOCKS STATUS
-------------------- ---------------------------------------- ---------------------------------------- ----------
IDX_TEST_MODIFY                                             0                                        0 VALID
PK_TEST_MODIFY                                         300000                                      626 N/A
/* PK_TEST_MODIFY状态N/A说明有索引子分区，说明pk索引转换成了local，普通索引转换成了global index */

索引转换官方文档说明

If you do not specify the INDEXES clause or the INDEXES clause does not specify all

the indexes on the original non-partitioned table, then the following default

behavior applies for all unspecified indexes.

– Global partitioned indexes remain the same and retain the original partitioning

shape.

– Non-prefixed indexes become global nonpartitioned indexes.

Prefixed indexes are converted to local partitioned indexes.

Prefixed means that the partition key columns are included in the index

definition, but the index definition is not limited to including the partitioning

keys only.

– Bitmap indexes become local partitioned indexes, regardless whether they are

prefixed or not.

Bitmap indexes must always be local partitioned indexes.

• The conversion operation cannot be performed if there are domain indexes

参考文档：

Oracle® Database VLDB and Partitioning Guide