从视图查询表分区的相关信息

分区表的分区键和分区类型都可以通过获取创建该分区表的DDL定义语句来了解，那么可不可以直接查询字典视图来获取这些信息呢？常用的dba_tab_partitions视图并没有包含我们想要的分区属性信息；这里我们可以用到dba_part_key_columns(describes the partitioning key columns for all partitioned objects in the database. Its columns are the same as those in

ALL_PART_KEY_COLUMNS)和

dba_part_tables(displays the object-level partitioning information for all partitioned tables in the database. Its columns are the same as those in

ALL_PART_TABLES

)这2个视图:

SQL> select * from v$version;
BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
PL/SQL Release 11.2.0.2.0 - Production
CORE    11.2.0.2.0      Production
TNS for Linux: Version 11.2.0.2.0 - Production
NLSRTL Version 11.2.0.2.0 - Production

SQL> desc dba_part_tables;
Name                                      Null?    Type
----------------------------------------- -------- ----------------------------
OWNER                                              VARCHAR2(30)
TABLE_NAME                                         VARCHAR2(30)
PARTITIONING_TYPE                                  VARCHAR2(9)
SUBPARTITIONING_TYPE                               VARCHAR2(9)
PARTITION_COUNT                                    NUMBER
DEF_SUBPARTITION_COUNT                             NUMBER
PARTITIONING_KEY_COUNT                             NUMBER
SUBPARTITIONING_KEY_COUNT                          NUMBER
STATUS                                             VARCHAR2(8)
DEF_TABLESPACE_NAME                                VARCHAR2(30)
DEF_PCT_FREE                                       NUMBER
DEF_PCT_USED                                       NUMBER
DEF_INI_TRANS                                      NUMBER
DEF_MAX_TRANS                                      NUMBER
DEF_INITIAL_EXTENT                                 VARCHAR2(40)
DEF_NEXT_EXTENT                                    VARCHAR2(40)
DEF_MIN_EXTENTS                                    VARCHAR2(40)
DEF_MAX_EXTENTS                                    VARCHAR2(40)
DEF_MAX_SIZE                                       VARCHAR2(40)
DEF_PCT_INCREASE                                   VARCHAR2(40)
DEF_FREELISTS                                      NUMBER
DEF_FREELIST_GROUPS                                NUMBER
DEF_LOGGING                                        VARCHAR2(7)
DEF_COMPRESSION                                    VARCHAR2(8)
DEF_COMPRESS_FOR                                   VARCHAR2(12)
DEF_BUFFER_POOL                                    VARCHAR2(7)
DEF_FLASH_CACHE                                    VARCHAR2(7)
DEF_CELL_FLASH_CACHE                               VARCHAR2(7)
REF_PTN_CONSTRAINT_NAME                            VARCHAR2(30)
INTERVAL                                           VARCHAR2(1000)
IS_NESTED                                          VARCHAR2(3)
DEF_SEGMENT_CREATION                               VARCHAR2(4)

SQL> desc dba_part_key_columns;
Name                                      Null?    Type
----------------------------------------- -------- ----------------------------
OWNER                                              VARCHAR2(30)
NAME                                               VARCHAR2(30)
OBJECT_TYPE                                        CHAR(5)
COLUMN_NAME                                        VARCHAR2(4000)
COLUMN_POSITION                                    NUMBER

SQL> col table_name for a20
SQL> col column_name for a20
SQL> col partition for a20

SQL> select t.table_name, kc.column_name, t.partitioning_type
2    from dba_part_key_columns kc, dba_part_tables t
3   where kc.owner = t.owner
4     and kc.name = t.table_name
5     and t.table_name='COSTS';

TABLE_NAME           COLUMN_NAME          PARTITION
-------------------- -------------------- ---------
COSTS                TIME_ID              RANGE

/* 针对存在子分区的表，需要用到dba_subpart_key_columns视图 */

SQL> select t.table_name, kc.column_name, t.partitioning_type
2    from dba_part_key_columns kc, dba_part_tables t
3   where kc.owner = t.owner
4     and kc.name = t.table_name
5     and t.table_name='PRODUCTS'
6   union all
7  select u.table_name,skc.column_name,u.subpartitioning_type
8    from dba_subpart_key_columns skc,dba_part_tables u
9   where skc.owner=u.owner
10   and skc.name=u.table_name
11   and u.subpartitioning_type!='NONE'
12   and u.table_name='PRODUCTS';

TABLE_NAME           COLUMN_NAME          PARTITION
-------------------- -------------------- ---------
PRODUCTS             T1                   RANGE
PRODUCTS             T2                   HASH

Script:

select t.table_name, kc.column_name, t.partitioning_type
from dba_part_key_columns kc, dba_part_tables t
where kc.owner = t.owner
and kc.name = t.table_name
and t.table_name = '&TABNAME'
and t.owner = '&OWNAME'
union all
select u.table_name, skc.column_name, u.subpartitioning_type
from dba_subpart_key_columns skc, dba_part_tables u
where skc.owner = u.owner
and skc.name = u.table_name
and u.subpartitioning_type != 'NONE'
and u.table_name = '&TABNAME'
and u.owner = '&OWNAME';

本文出自 “Ask Maclean Liu Oracle” 博客，请务必保留此出处http://maclean.blog.51cto.com/2923249/1277567