了解如何分区表

Question

有没有办法找出，是否在Oracle中使用哈希，范围或列表对表进行了分区？ 我在元数据表中找不到这样的信息。

感谢您的帮助。

Answer 1

您尚未充分搜索元数据表。

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> 

使用user_part_tables代替all_part_tables应该会更好，然后请忽略owner = 'SYS'子句中的where谓词。