关于分区表与唯一索引的测试记录

关于分区表与唯一索引，以下是一点测试记录。

非分区字段不能创建Local Unique索引：

SQL> connect eygle/eygle
Connected.
SQL> CREATE TABLE docinfo(
  2  docid    NUMBER ,
  3  docsz    NUMBER ,
  4  CONSTRAINT uk_docid UNIQUE(docid) USING INDEX LOCAL)
  5  PARTITION BY RANGE(docsz)
  6  (PARTITION p1 VALUES LESS THAN (100),
  7  PARTITION p2 VALUES LESS THAN(MAXVALUE));
CREATE TABLE docinfo(
*
ERROR at line 1:
ORA-14039: partitioning columns must form a subset of key columns of a UNIQUE index

当然此时可以创建全局Unique索引：

SQL> CREATE TABLE docinfo(
  2  docid    NUMBER ,
  3  docsz    NUMBER ,
  4  CONSTRAINT uk_docid UNIQUE(docid) USING  INDEX )
  5  PARTITION BY RANGE(docsz)
  6  (PARTITION p1 VALUES LESS THAN (100),
  7  PARTITION p2 VALUES LESS THAN(MAXVALUE));

Table created.

可以在分区字段上创建Local Unique索引：

SQL> CREATE TABLE docinfo(
  2  docid    NUMBER ,
  3  docsz    NUMBER ,
  4  CONSTRAINT uk_docsz UNIQUE(docsz) USING  INDEX LOCAL)
  5  PARTITION BY RANGE(docsz)
  6  (PARTITION p1 VALUES LESS THAN (100),
  7  PARTITION p2 VALUES LESS THAN(MAXVALUE));

Table created.

SQL> drop table docinfo;

Table dropped.

或者可以创建包含分区字段的联合Unique索引：

SQL> CREATE TABLE docinfo(
  2  docid    NUMBER ,
  3  docsz    NUMBER ,
  4  CONSTRAINT uk_docsz UNIQUE(docid,docsz) USING  INDEX LOCAL)
  5  PARTITION BY RANGE(docsz)
  6  (PARTITION p1 VALUES LESS THAN (100),
  7  PARTITION p2 VALUES LESS THAN(MAXVALUE));

Table created.

SQL> drop table docinfo;

Table dropped.