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flashback之——挖掘SCN（DDL和DML操作示例）

發布時間：2020-05-21 13:52:55 來源：網絡 閱讀：749 作者：君落塵 欄目：關系型數據庫



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1、查詢當前日志組21:43:00 sys@TESTDB11>select * from v$log;

         1    1    36   52428800   512     1 NO  CURRENT     1349824

2、查詢日志文件 21:42:44 sys@TESTDB11>select * from v$logfile;

GROUP# STATUS  TYPE    MEMBER                                             IS_

---------- ------- ------- -------------------------------------------------- ---

         3         ONLINE  +DATA/testdb11/redo03.log                          NO

         2         ONLINE  +DATA/testdb11/redo02.log                          NO

         1         ONLINE  +DATA/testdb11/redo01.log                          NO

3、查詢歸檔日志文件21:42:28 sys@TESTDB11>select name from v$archived_log;

/home/oracle/archivelog_bak/TestDB111_31_846843855.dbf

/home/oracle/archivelog_bak/TestDB111_32_846843855.dbf

/home/oracle/archivelog_bak/TestDB111_33_846843855.dbf

/home/oracle/archivelog_bak/TestDB111_34_846843855.dbf

/home/oracle/archivelog_bak/TestDB111_35_846843855.dbf

/home/oracle/archivelog_bak/TestDB111_36_846843855.dbf


DML操作 挖scn和時間點

依次在sqlplus中執行 NEW當前的日志組多個加逗號隔開，ADDFILE最后一次歸檔文件

EXECUTE DBMS_LOGMNR.ADD_LOGFILE( -      

   LOGFILENAME => '+DATA/testdb11/redo01.log', -             

   OPTIONS => DBMS_LOGMNR.NEW);


EXECUTE DBMS_LOGMNR.ADD_LOGFILE( -

   LOGFILENAME => '/home/oracle/archivelog_bak/TestDB111_36_846843855.dbf', -

   OPTIONS => DBMS_LOGMNR.ADDFILE);

   

EXECUTE DBMS_LOGMNR.START_LOGMNR(OPTIONS => -

   DBMS_LOGMNR.DICT_FROM_ONLINE_CATALOG);


EXECUTE DBMS_LOGMNR.END_LOGMNR;


alter session set nls_date_format='yyyy-mm-dd hh34:mi:ss';

col username for a10

col sql_redo for a50

select username,scn,timestamp,sql_redo from v$logmnr_contents where seg_name='t1' order by scn;


1363373 2014-05-20 20:15:41   


倆種閃回

flashback table scott.t1 to scn 1363373;

flashback table scott.t1 to timestmp to_timestmp('2014-05-20 20:15:41','yyyy-mm-dd hh34:mi:ss');






例：DML 操作閃回表

SQL> create table t1 as select * from scott.dept;


Table created.


SQL> select * from t1;


    DEPTNO DNAME          LOC

---------- -------------- -------------

        10 ACCOUNTING     NEW YORK

        20 RESEARCH       DALLAS

        30 SALES          CHICAGO

        40 OPERATIONS     BOSTON

SQL> delete t1;


4 rows deleted.


SQL> insert into t1 select * from scott.dept where deptno=10;


1 row created.


SQL> select * from t1;


    DEPTNO DNAME          LOC

---------- -------------- -------------

        10 ACCOUNTING     NEW YORK


SQL> commit;


Commit complete.


SQL> select * from v$log;


    GROUP#    THREAD#  SEQUENCE#      BYTES    MEMBERS ARC STATUS           FIRST_CHANGE# FIRST_TIME

---------- ---------- ---------- ---------- ---------- --- ---------------- ------------- -------------------

         1          1         86   52428800          2 YES INACTIVE                862829 2014-07-22 16:00:01

         2          1         87   52428800          2 YES INACTIVE                862850 2014-07-22 16:00:03

         3          1         88   52428800          2 NO  CURRENT                 862976 2014-07-22 16:02:18


首先

開啟database補充日志

alter database add supplemental log data;


當前日志組

EXECUTE DBMS_LOGMNR.ADD_LOGFILE( -      

   LOGFILENAME => '/prod_log/prod/redo13.log', -             

   OPTIONS => DBMS_LOGMNR.NEW);


最后一次歸檔可寫多個，倒序寫

EXECUTE DBMS_LOGMNR.ADD_LOGFILE( -

   LOGFILENAME => '/arch/1_87_853529715.dbf', -

   OPTIONS => DBMS_LOGMNR.ADDFILE);

   

EXECUTE DBMS_LOGMNR.ADD_LOGFILE( -

   LOGFILENAME => '/arch/1_86_853529715.dbf', -

   OPTIONS => DBMS_LOGMNR.ADDFILE);

 

EXECUTE DBMS_LOGMNR.ADD_LOGFILE( -

   LOGFILENAME => '/arch/1_85_853529715.dbf', -

   OPTIONS => DBMS_LOGMNR.ADDFILE);

      

EXECUTE DBMS_LOGMNR.START_LOGMNR(OPTIONS => -

   DBMS_LOGMNR.DICT_FROM_ONLINE_CATALOG);


EXECUTE DBMS_LOGMNR.END_LOGMNR;


alter session set nls_date_format='yyyy-mm-dd hh34:mi:ss';

col username for a10

col sql_redo for a50

select username,scn,timestamp,sql_redo from v$logmnr_contents where seg_name='T1' order by scn;


USERNAME          SCN TIMESTAMP           SQL_REDO

---------- ---------- ------------------- --------------------------------------------------


SYS            863211 2014-07-22 16:10:20 insert into "SYS"."T1"("DEPTNO","DNAME","LOC") val

                                          ues ('40','OPERATIONS','BOSTON');


SYS            863228 2014-07-22 16:10:51 delete from "SYS"."T1" where "DEPTNO" = '10' and "

                                          DNAME" = 'ACCOUNTING' and "LOC" = 'NEW YORK' and R

                                          OWID = 'AAAM4GAABAAAO2iAAA';


SYS            863228 2014-07-22 16:10:51 delete from "SYS"."T1" where "DEPTNO" = '20' and "

                                          DNAME" = 'RESEARCH' and "LOC" = 'DALLAS' and ROWID

                                           = 'AAAM4GAABAAAO2iAAB';


開啟行遷移

alter table t1 enable row movement;

基于scn

flashback table t1 to scn 863227;

基于時間點

flashback table t1 to timestamp to_timestamp('2014-07-22 16:10:50','yyyy-mm-dd hh34:mi:ss');

閃回查詢

select * from t1 as of timestamp to_timestamp('2014-07-22 16:10:50','yyyy-mm-dd hh34:mi:ss');


sys用戶不能使用flashback，用閃回查詢創建

create table t2 as select * from t1 as of timestamp to_timestamp('2014-07-22 16:10:50','yyyy-mm-dd hh34:mi:ss');




注：可能出現的報錯信息

SQL> select * from t1 as of timestamp to_timestamp('2014-07-22 16:10:20','yyyy-mm-dd hh34:mi:ss');

select * from t1 as of timestamp to_timestamp('2014-07-22 16:10:20','yyyy-mm-dd hh34:mi:ss')

              *

ERROR at line 1:

ORA-01466: unable to read data - table definition has changed

時間點找的不對，應該找delete刪除之前的幾秒鐘


SQL> flashback table t1 to timestamp to_timestamp('2014-07-22 16:10:30','yyyy-mm-dd hh34:mi:ss');

flashback table t1 to timestamp to_timestamp('2014-07-22 16:10:30','yyyy-mm-dd hh34:mi:ss')

                *

ERROR at line 1:

ORA-08185: Flashback not supported for user SYS








DDL操作 閃回數據庫  ***注：最好在備庫上做閃回數據庫操作，再邏輯導入到主庫中

SQL> create table t2 as select * from dept;


Table created.


SQL> select * from t2;


    DEPTNO DNAME          LOC

---------- -------------- -------------

        10 ACCOUNTING     NEW YORK

        20 RESEARCH       DALLAS

        30 SALES          CHICAGO

        40 OPERATIONS     BOSTON


SQL> drop table t2 purge;


Table dropped.


設置參數，存放數據字典

mkdir /home/oracle/logmnr

SQL> show parameter utl


NAME                                 TYPE        VALUE

------------------------------------ ----------- ------------------------------

create_stored_outlines               string

utl_file_dir                         string

SQL> alter system set utl_file_dir='/home/oracle/logmnr' scope=spfile;


System altered.

SQL> startup force;

ORACLE instance started.


Total System Global Area  570425344 bytes

Fixed Size                  2022480 bytes

Variable Size             209716144 bytes

Database Buffers          352321536 bytes

Redo Buffers                6365184 bytes

Database mounted.

Database opened.


建立數據字典文件dict.ora

execute dbms_logmnr_d.build('dict.ora','/home/oracle/logmnr',dbms_logmnr_d.store_in_flat_file);


添加日志分析

EXECUTE DBMS_LOGMNR.ADD_LOGFILE( -      

   LOGFILENAME => '/arch/1_110_853529715.dbf', -             

   OPTIONS => DBMS_LOGMNR.NEW);


EXECUTE DBMS_LOGMNR.ADD_LOGFILE( -

   LOGFILENAME => '/arch/1_109_853529715.dbf', -

   OPTIONS => DBMS_LOGMNR.ADDFILE);

   

EXECUTE DBMS_LOGMNR.ADD_LOGFILE( -

   LOGFILENAME => '/arch/1_108_853529715.dbf', -

   OPTIONS => DBMS_LOGMNR.ADDFILE);

 

EXECUTE DBMS_LOGMNR.ADD_LOGFILE( -

   LOGFILENAME => '/arch/1_107_853529715.dbf', -

   OPTIONS => DBMS_LOGMNR.ADDFILE);


execute dbms_logmnr.end_logmnr;


執行分析

execute dbms_logmnr.start_logmnr(dictfilename=>'/home/oracle/logmnr/dict.ora',options=>dbms_logmnr.ddl_dict_tracking);


查看分析結果

alter session set nls_date_format='yyyy-mm-dd hh34:mi:ss';

col username for a10

col sql_redo for a50

select username,scn,timestamp,sql_redo from v$logmnr_contents where username='SCOTT' and lower(sql_redo) like '%table%';


SQL> select username,scn,timestamp,sql_redo from v$logmnr_contents where username='SCOTT' and lower(sql_redo) like '%table%';


USERNAME          SCN TIMESTAMP           SQL_REDO

---------- ---------- ------------------- --------------------------------------------------

SCOTT          898096 2014-07-22 17:54:04 drop table t1 purge;

SCOTT          898346 2014-07-22 17:55:27 create table t2 as select * from dept;

SCOTT          899047 2014-07-22 17:56:24 drop table t2 purge;



flashback database to scn 898096;

flashback database to timestamp to_timestamp('2014-07-22 17:55:45','yyyy-mm-dd hh34:mi:ss');


關庫到mount 閃回

SQL> shutdown immediate;

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL> startup mount;

ORACLE instance started.


Total System Global Area  570425344 bytes

Fixed Size                  2022480 bytes

Variable Size             218104752 bytes

Database Buffers          343932928 bytes

Redo Buffers                6365184 bytes

Database mounted.

SQL> flashback database to timestamp to_timestamp('2014-07-22 17:55:45','yyyy-mm-dd hh34:mi:ss');


Flashback complete.


只讀

SQL> alter database open read only;


Database altered.


SQL> select * from scott.t2;


    DEPTNO DNAME          LOC

---------- -------------- -------------

        10 ACCOUNTING     NEW YORK

        20 RESEARCH       DALLAS

        30 SALES          CHICAGO

        40 OPERATIONS     BOSTON


SQL> shutdown immediate;

SQL> startup mount;

ORACLE instance started.


Total System Global Area  570425344 bytes

Fixed Size                  2022480 bytes

Variable Size             218104752 bytes

Database Buffers          343932928 bytes

Redo Buffers                6365184 bytes

Database mounted.

SQL> alter database open resetlogs;


Database altered.


SQL> select * from scott.t2;


    DEPTNO DNAME          LOC

---------- -------------- -------------

        10 ACCOUNTING     NEW YORK

        20 RESEARCH       DALLAS

        30 SALES          CHICAGO

        40 OPERATIONS     BOSTON

















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