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  • 延迟段创建的学习-实验

    SQL> CREATE TABLE part_time_employees (
      2      empno NUMBER(8),
      3      name VARCHAR2(30),
      4      hourly_rate NUMBER (7,2)
      5      )  
      6      SEGMENT CREATION DEFERRED;

    Table created.

    SQL> CREATE TABLE hourly_employees (
      2      empno NUMBER(8),
      3      name VARCHAR2(30),
      4      hourly_rate NUMBER (7,2)
      5      )
      6     SEGMENT CREATION IMMEDIATE
      7     PARTITION BY RANGE(empno)
      8      (PARTITION empno_to_100 VALUES LESS THAN (100),
      9      PARTITION empno_to_200 VALUES LESS THAN (200));

    Table created.


    sql> select segment_name,partition_name from user_segments
    rows will be truncated

    SQL> col segment_name format a30
    SQL> /

    SEGMENT_NAME                   PARTITION_NAME
    ------------------------------ ------------------------------
    REGIONS
    LOCATIONS
    DEPARTMENTS
    JOBS
    EMPLOYEES
    JOB_HISTORY
    DIGITS
    HOURLY_EMPLOYEES               EMPNO_TO_100
    HOURLY_EMPLOYEES               EMPNO_TO_200
    REG_ID_PK
    COUNTRY_C_ID_PK

    SEGMENT_NAME                   PARTITION_NAME
    ------------------------------ ------------------------------
    LOC_ID_PK
    LOC_CITY_IX
    LOC_STATE_PROVINCE_IX
    LOC_COUNTRY_IX
    DEPT_ID_PK
    DEPT_LOCATION_IX
    JOB_ID_PK
    EMP_EMAIL_UK
    EMP_EMP_ID_PK
    EMP_DEPARTMENT_IX
    EMP_JOB_IX

    SEGMENT_NAME                   PARTITION_NAME
    ------------------------------ ------------------------------
    EMP_MANAGER_IX
    EMP_NAME_IX
    JHIST_EMP_ID_ST_DATE_PK
    JHIST_JOB_IX
    JHIST_EMPLOYEE_IX
    JHIST_DEPARTMENT_IX

    28 rows selected.

    SQL>  select segment_name,partition_name from user_segments where segment_name like 'HOURLY%';

    SEGMENT_NAME                   PARTITION_NAME
    ------------------------------ ------------------------------
    HOURLY_EMPLOYEES               EMPNO_TO_100
    HOURLY_EMPLOYEES               EMPNO_TO_200

    SQL>  select segment_name,partition_name from user_segments where segment_name like 'PART%';

    no rows selected

    SQL>
    SQL>
    SQL>
    SQL> SELECT TABLE_NAME, SEGMENT_CREATED FROM USER_TABLES;

    TABLE_NAME       SEG
    ---------------- ---
    LOCATIONS        YES
    PART_TIME_EMPLOY NO
    HOURLY_EMPLOYEES N/A
    COUNTRIES        YES
    ADMIN_WORK_AREA  YES
    EMPLOYEES        YES
    REGIONS          YES
    DEPARTMENTS      YES
    JOB_HISTORY      YES
    JOBS             YES
    DIGITS           YES

    11 rows selected.

    SQL> SELECT table_name, segment_created, partition_name
      2   FROM user_tab_partitions;

    TABLE_NAME       SEG PARTITION_NAME
    ---------------- --- ------------------------------
    HOURLY_EMPLOYEES YES EMPNO_TO_200
    HOURLY_EMPLOYEES YES EMPNO_TO_100

    SQL> INSERT INTO hourly_employees VALUES (99, 'FRose', 20.00);
    INSERT INTO hourly_employees VALUES (150, 'LRose', 25.00);
    1 row created.


    SQL> INSERT INTO hourly_employees VALUES (150, 'LRose', 25.00);
    INSERT INTO hourly_employees VALUES (150, 'LRose', 25.00);INSERT INTO hourly_employees VALUES (150, 'LRose', 25.00)
                                                             *
    ERROR at line 1:
    ORA-00911: invalid character


    SQL> INSERT INTO hourly_employees VALUES (150, 'LRose', 25.00);

    1 row created.

    SQL> INSERT INTO hourly_employees VALUES (150, 'LRose', 25.00);

    1 row created.

    SQL> select count(*) from hourly_empaloyees;
    select count(*) from hourly_empaloyees
                         *
    ERROR at line 1:
    ORA-00942: table or view does not exist


    SQL> c/hourly_empaloyees/hourly_employees;
      1* select count(*) from hourly_employees
    SQL> r
      1* select count(*) from hourly_employees

      COUNT(*)
    ----------
             3

    SQL>
    SQL> select * from hourly_employees;

         EMPNO NAME                           HOURLY_RATE
    ---------- ------------------------------ -----------
            99 FRose                                   20
           150 LRose                                   25
           150 LRose                                   25

    SQL>
    SQL>
    SQL> INSERT INTO part_time_employees VALUES (50, 'KReilly', 10.00);

    1 row created.

    SQL> INSERT INTO part_time_employees VALUES (50, 'KReilly', 10.00);

    1 row created.

    SQL> INSERT INTO part_time_employees VALUES (50, 'KReilly', 10.00);

    1 row created.

    SQL> SELECT segment_name, partition_name FROM user_segments;

    SEGMENT_NAME                   PARTITION_NAME
    ------------------------------ ------------------------------
    REGIONS
    LOCATIONS
    DEPARTMENTS
    JOBS
    EMPLOYEES
    JOB_HISTORY
    DIGITS
    PART_TIME_EMPLOYEES
    HOURLY_EMPLOYEES               EMPNO_TO_100
    HOURLY_EMPLOYEES               EMPNO_TO_200
    REG_ID_PK

    SEGMENT_NAME                   PARTITION_NAME
    ------------------------------ ------------------------------
    COUNTRY_C_ID_PK
    LOC_ID_PK
    LOC_CITY_IX
    LOC_STATE_PROVINCE_IX
    LOC_COUNTRY_IX
    DEPT_ID_PK
    DEPT_LOCATION_IX
    JOB_ID_PK
    EMP_EMAIL_UK
    EMP_EMP_ID_PK
    EMP_DEPARTMENT_IX

    SEGMENT_NAME                   PARTITION_NAME
    ------------------------------ ------------------------------
    EMP_JOB_IX
    EMP_MANAGER_IX
    EMP_NAME_IX
    JHIST_EMP_ID_ST_DATE_PK
    JHIST_JOB_IX
    JHIST_EMPLOYEE_IX
    JHIST_DEPARTMENT_IX

    29 rows selected.

    SQL>

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  • 原文地址:https://www.cnblogs.com/snake-hand/p/3161624.html
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