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  • 【练习】flashback基于scn的闪回查询

    1.创建表dept1:

    13:01:03 SCOTT@ORA11GR2>create table dept1 as select * from dept;
    
    Table created.
    
    13:01:40 SCOTT@ORA11GR2>select * from dept1;
    
        DEPTNO DNAME          LOC
    ---------- -------------- -------------
            10 ACCOUNTING     NEW YORK
            20 RESEARCH       DALLAS
            30 SALES          CHICAGO
            40 OPERATIONS     BOSTON
    13:02:22 SCOTT@ORA11GR2>insert into dept1 values(50,'xxx','xxxx');
    
    1 row created.

    2.查看当前的scn:

    13:04:12 SYS@ORA11GR2>select current_scn from v$database;
    
    CURRENT_SCN
    -----------
        1006836

    3.删除表dept1:

    13:07:51 SCOTT@ORA11GR2>delete from dept1;
    
    4 rows deleted.
    
    13:08:03 SCOTT@ORA11GR2>select * from dept1;
    
    no rows selected

    4.基于scn的查询:

    13:08:15 SCOTT@ORA11GR2>select * from dept1 as of scn 1006836;
    
        DEPTNO DNAME          LOC
    ---------- -------------- -------------
            20 RESEARCH       DALLAS
            30 SALES          CHICAGO
            40 OPERATIONS     BOSTON
            50 xxx            xxxx
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  • 原文地址:https://www.cnblogs.com/tomatoes-/p/6159434.html
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