select * from user_constraints; select * from all_constraints; select * from dba_constraints; 三、索引及其操作 1、创建索引 create [unique] index 索引名 on 表名(列名1 ASC|DESC,列名2 ASC|DESC,...,列名n ASC|DESC) [tablespace 表空间名]; 注:基表中的列名,一个索引最多有16列,long列、long...
在任何数据库系统中,有时都需要修改表的逻辑或物理结构以提高查询或 DML 的性能、适应应用程序更改或管理存储。您可以使用DBMS_REDEFINITION 该软件包在线重新定义表。 Oracle 数据库提供了一种机制来修改表结构,而不会显着影响表的可用性。该机制称为在线表重新定义。与重新定义表格的传统方法相比,在线重新定义表格可...
where table_name='LST_RNG_LIST'; 依照设定的子分区创建range子分区 3.3、两个List一个Range測试 3.3.1、创建分区 drop table LST_RNG_LIST cascade constraints; /*===*/ /* Table: LST_RNG_LIST */ /*===*/ create table LST_RNG_LIST ( AUTO_ID VARCHAR2(36) not null, SALE_NO VARCHAR2(36...
Finally, the process of normalization includes the creation of foreign key relationships and other data constraints. These relationships build a level of data integrity directly into your database design. Figure 4-3 shows a simple list of attributes grouped into entities and linked by a foreign key...
SQL> desc dba_constraints 查看约束 SQL> desc dba_cons_columns 查看列约束 SQL> show parameter log_archive_dest; 查看archive log所在位置 SQL> archive log list; 查看归档目录以及log sequence SQL> select * from V$FLASH_RECOVERY_AREA_USAGE; 查看flash_recovery_area 使用情况。
ECIALIST_JOB Has Author privileges Associated Application Roles Functional Area Author CX Service OA4F_CX_SERV ICE_REQUEST_ ANALYSIS_DUT Y OA4F_CX_SERV ICE_REQUEST_ CUSTOM_DATA OA4F_CX_SERV ICE_REQUEST_ ALL_DATA Author CX Subscription OA4F_CX_SUBC RIPTIONS_ANAL YSIS_DUTY OA4F_CX_SUBS ...
选择OBE_TASKS 表,然后单击 Constraints 选项卡。 3. 单击Create。 4. 为Constraint Type 选择 Foreign Key。为 Foreign Key Column 选择 ASSIGNED_TO,为 Reference Table Name 选择 OBE_EMPLOYEES,以及为 Reference Table Column List 选择 EMPLOYEE_ID。然后,单击 Next >。 5. 单击Finish。 6. 约束创建成功。
Here’s the list of statements aimed at index t1_pk. Note that t1_pk(id) is a unique index on a primary key constraint, t1_uk(col3) is a non-unique index covering a unique constraints, t2_col3(col3) is a single column non-unique index. 1 2 3 4 5 6 7 8 9 10 11 12 ...
and finally creates all constraints. This avoids problems. It is possible to migrate the database to an Oracle database in stages. For example, you can first create the users and their tables, then create the constraints, and finally load the data. However, doing this might cause problems ...
Use real-time resource availability and work orders to create feasible schedules that take the latest material, capacity, and calendar constraints into account. Increase factory throughput and reduce work in process inventory, waste, and expedites. Optimize changeovers to minimize downtime Increase thro...