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oracle 12c 数据归档 即Using In-Database Archiving feature

原创 Oracle 作者:paulyibinyi 时间:2016-03-17 13:16:02 0 删除 编辑
在oracle 12c 通过Using In-Database Archiving feature 特性,来启到分离在线数据和历史数据的作用,
即数据归档,应用可以有选择性的访问在线数据或者历史数据,要启用这个特性,在建表的时候启用ROW ARCHIVAL,
并操作ORA_ARCHIVE_STATE 这个隐藏字段,此外用户还可以指定会话级别的 ROW ARCHIVAL VISIBILITY为ACTIVE  或者ALL
active就是看到在线数据,ALL的话就是全部数据。
/* Set visibility to ACTIVE to display only active rows of a table.*/
ALTER SESSION SET ROW ARCHIVAL VISIBILITY = ACTIVE;

CREATE TABLE employees_indbarch 
 (employee_id NUMBER(6) NOT NULL, 
  first_name VARCHAR2(20), last_name VARCHAR2(25) NOT NULL, 
  email VARCHAR2(25) NOT NULL, phone_number VARCHAR2(20), 
  hire_date DATE NOT NULL, job_id VARCHAR2(10) NOT NULL, salary  NUMBER(8,2),
  commission_pct NUMBER(2,2), manager_id NUMBER(6), department_id NUMBER(4)) ROW ARCHIVAL;

INSERT INTO employees_indbarch(employee_id, first_name, last_name, email,
  hire_date, job_id, salary, manager_id, department_id) 
  VALUES (251, 'Scott', 'Tiger', 'scott.tiger@example.com', '21-MAY-2009',
 'IT_PROG', 50000, 103, 60);

INSERT INTO employees_indbarch(employee_id, first_name, last_name, email,
  hire_date, job_id, salary, manager_id, department_id) 
  VALUES (252, 'Jane', 'Lion', 'jane.lion@example.com', '11-JUN-2009', 
  'IT_PROG', 50000, 103, 60);

/* Show all the columns in the table, including hidden columns */
SELECT SUBSTR(COLUMN_NAME,1,22) NAME, SUBSTR(DATA_TYPE,1,20) DATA_TYPE, COLUMN_ID AS COL_ID,
  SEGMENT_COLUMN_ID AS SEG_COL_ID, INTERNAL_COLUMN_ID AS INT_COL_ID, HIDDEN_COLUMN, CHAR_LENGTH 
  FROM USER_TAB_COLS WHERE TABLE_NAME='EMPLOYEES_INDBARCH';

NAME                   DATA_TYPE                COL_ID SEG_COL_ID INT_COL_ID HID CHAR_LENGTH
---------------------- -------------------- ---------- ---------- ---------- --- -----------
ORA_ARCHIVE_STATE      VARCHAR2                                 1          1 YES        4000
EMPLOYEE_ID            NUMBER                        1          2          2 NO            0
FIRST_NAME             VARCHAR2                      2          3          3 NO           20
LAST_NAME              VARCHAR2                      3          4          4 NO           25
EMAIL                  VARCHAR2                      4          5          5 NO           25
PHONE_NUMBER           VARCHAR2                      5          6          6 NO           20
HIRE_DATE              DATE                          6          7          7 NO            0
JOB_ID                 VARCHAR2                      7          8          8 NO           10
SALARY                 NUMBER                        8          9          9 NO            0
COMMISSION_PCT         NUMBER                        9         10         10 NO            0
MANAGER_ID             NUMBER                       10         11         11 NO            0
DEPARTMENT_ID          NUMBER                       11         12         12 NO            0

/* Decrease the ORA_ARCHIVE_STATE column size to improve formatting in queries */
COLUMN ORA_ARCHIVE_STATE FORMAT a18;
/* The default value for ORA_ARCHIVE_STATE is '0', which means active */
SELECT employee_id, ORA_ARCHIVE_STATE FROM employees_indbarch;
 
EMPLOYEE_ID ORA_ARCHIVE_STATE
----------- ------------------
        251 0
        252 0

/* Insert a value into ORA_ARCHIVE_STATE to set inactive */
UPDATE employees_indbarch SET ORA_ARCHIVE_STATE = '20' WHERE employee_id = 252;

/* Only active records are in the following query */
SELECT employee_id, ORA_ARCHIVE_STATE FROM employees_indbarch;

EMPLOYEE_ID ORA_ARCHIVE_STATE
----------- ------------------
        251 0

/* Set visibility to ALL to display all records */
ALTER SESSION SET ROW ARCHIVAL VISIBILITY = ALL;

SELECT employee_id, ORA_ARCHIVE_STATE FROM employees_indbarch;

EMPLOYEE_ID ORA_ARCHIVE_STATE
----------- ------------------
        251 0
        252 20

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