了解表是如何分区的

Question

有什么办法可以查明Oracle中的表是按Hash、Range还是List分区的？ 我在元数据表中找不到此类信息。

感谢您的帮助。

Answer 1

你没有足够的搜索元数据表。

Connected to Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 
Connected as xxx@yyy

SQL> select owner, table_name, partitioning_type, subpartitioning_type
SQL> from all_part_tables
SQL> where owner = 'SYS'
SQL>     and rownum <= 10
SQL> ;

OWNER                                                                            TABLE_NAME                                                                       PARTITIONING_TYPE SUBPARTITIONING_TYPE
-------------------------------------------------------------------------------- -------------------------------------------------------------------------------- ----------------- --------------------
SYS                                                                              AQ$_SUBSCRIBER_LWM                                                               HASH              NONE
SYS                                                                              WRH$_FILESTATXS                                                                  RANGE             NONE
SYS                                                                              WRH$_SQLSTAT                                                                     RANGE             NONE
SYS                                                                              WRH$_SYSTEM_EVENT                                                                RANGE             NONE
SYS                                                                              WRH$_WAITSTAT                                                                    RANGE             NONE
SYS                                                                              WRH$_LATCH                                                                       RANGE             NONE
SYS                                                                              WRH$_LATCH_CHILDREN                                                              RANGE             NONE
SYS                                                                              WRH$_LATCH_PARENT                                                                RANGE             NONE
SYS                                                                              WRH$_LATCH_MISSES_SUMMARY                                                        RANGE             NONE
SYS                                                                              WRH$_EVENT_HISTOGRAM                                                             RANGE             NONE
10 rows selected

SQL> 

最好使用user_part_tables 而不是all_part_tables，然后请在where 子句中省略owner = 'SYS' 谓词。