OCP-1Z0-053-V12.02-17题

17.The INV_HISTORY table is created using the command:

SQL>CREATE TABLE INV_HISTORY (inv_no NUMBER(3), inv_date DATE, inv_amt NUMBER(10,2))

partition by range (inv_date) interval (numtoyminterval(1,'month'))

 (partition p0 values less than (to_date('01-01-2005','dd-mm-yyyy')), 

partition p1 values less than (to_date('01-01-2006','dd-mm-yyyy')));

The following data has been inserted into the INV_HISTORY table :

INV_NO INV_DATE INV_AMT 

1 30-dec-2004 1000 

2 30-dec-2005 2000 

3 1-feb-2006 3000 

4 1-mar-2006 4000 

5 1-apr-2006 5000

You would like to store the data belonging to the year 2006 in a single partition and issue the command:

SQL> ALTER TABLE inv_history MERGE PARTITIONS

FOR(TO_DATE('15-feb-2006','dd-mon-yyyy')), FOR(TO_DATE('15-apr-2006')) INTO PARTITION sys_py;

What would be the outcome of this command?

A. It executes successfully, and the transition point is set to '1-apr-2006'.

B. It executes successfully, and the transition point is set to '15-apr-2006'.

C. It produces an error because the partitions specified for merging are not adjacent.

D. It produces an error because the date values specified in the merge do not match the date values

stored in the table.

Answer: C

答案解析：

参考实验：

sys@TEST1107> CREATE TABLE INV_HISTORY (inv_no NUMBER(3), inv_date DATE, inv_amt NUMBER(10,2))

  2  partition by range (inv_date) interval (numtoyminterval(1,'month'))

  3  (partition p0 values less than (to_date('01-01-2005','dd-mm-yyyy')),

  4  partition p1 values less than (to_date('01-01-2006','dd-mm-yyyy')));

Table created.

sys@TEST1107> insert into INV_HISTORY values (1,'30-dec-2004',1000);  

1 row created.

sys@TEST1107> insert into INV_HISTORY values (2,'30-dec-2005',2000);

1 row created.

sys@TEST1107> insert into INV_HISTORY values (3,'1-feb-2006',3000);

1 row created.

sys@TEST1107> insert into INV_HISTORY values (4,'1-mar-2006',4000);

1 row created.

sys@TEST1107> insert into INV_HISTORY values (5,'1-apr-2006',5000);

1 row created.

sys@TEST1107> select * from INV_HISTORY;

    INV_NO INV_DATE              INV_AMT

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

         1 30-DEC-04                1000

         2 30-DEC-05                2000

         3 01-FEB-06                3000

         4 01-MAR-06                4000

         5 01-APR-06                5000

sys@TEST1107> select * from INV_HISTORY partition(p0);

    INV_NO INV_DATE              INV_AMT

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

         1 30-DEC-04                1000

sys@TEST1107> select * from INV_HISTORY partition(p1);

    INV_NO INV_DATE              INV_AMT

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

         2 30-DEC-05                2000

sys@TEST1107> ALTER TABLE inv_history MERGE PARTITIONS

  2  FOR(TO_DATE('15-feb-2006','dd-mon-yyyy')), FOR(TO_DATE('15-apr-2006')) INTO PARTITION sys_py;

ALTER TABLE inv_history MERGE PARTITIONS

*

ERROR at line 1:

ORA-14274: partitions being merged are not adjacent

INTERVAL Clause

Use this clause to establish interval partitioning for the table. Interval partitions are partitions based on a numeric range or datetime interval. They extend range partitioning by instructing the database to create partitions of the specified range or interval automatically when data inserted into the table exceeds all of the range partitions.