alter database recover managed standby database cancel;
ALTER SYSTEM SET db_recovery_file_dest_size=1024G SCOPE=BOTH;
ALTER SYSTEM SET db_recovery_file_dest=‘/xxxx/实际情况选择路径‘ SCOPE=BOTH;
alter system set db_flashback_retention_target=9000 scope=both;
alter database flashback on;
create restore point flashback_dzswrac GUARANTEE flashback database;

#确认grant point已创建完毕之后，在进行dg角色更换
SQL> select * from v$restore_point;

#如下操作，切换备库角色为主库角色

alter database activate standby database;
alter database open;
alter system set job_queue_processes=0;
exit

1）选择抓取，日志切换频率最高的时间节点，明确所需要挖掘的日志时间节点

SQL>select to_char(completion_time,‘YYYYMMDD HH24‘),dest_id,thread#,name
   from v$archived_Log
   where dest_id=1 and completion_time between to_date(‘20190104 14‘,‘yyyymmdd hh24‘) and to_date(‘20190104 19‘,‘yyyymmdd hh24‘)
TO_CHAR(COM    DEST_ID    THREAD# NAME
----------- ---------- ---------- --------------------
20190104 16          1          2
20190104 16          1          2
20190104 16          1          1
20190104 16          1          2
20190104 16          1          2
20190104 16          1          2
6 rows selected.
上述查询，得到04日，一个小时，日志切换了6次
COMPLETION_TIME 归档完成的时间

2）查询日志挖掘的文件名称

select to_char(completion_time,‘YYYYMMDD HH24:mi‘),dest_id,thread#,name,deleted,status

from v$archived_Log
where dest_id=1 and completion_time between to_date(‘20190104 14‘,‘yyyymmdd hh24‘) and to_date(‘20190104 22‘,‘yyyymmdd hh24‘)
order by 1;
TO_CHAR(COMPLE DEST_ID THREAD# NAME DEL S
-------------- ---------- ---------- -------------------------------------------------- --- -
20190104 14:03 1 1 xxxx NO A
20190104 14:03 1 2 xxxx NO A
20190104 14:30 1 2 xxxx NO A
20190104 14:45 1 2 xxxx NO A
20190104 14:49 1 1 xxxx NO A
20190104 14:49 1 2 xxxx NO A
20190104 14:50 1 2 xxxx NO A

--如下忽略
20190104 15:03 1 2 xxxx NO A

3）logminer前提准备

添加存储过程

@?/rdbms/admin/dbmslmd.sql
@?/rdbms/admin/dbmslm.sql
@?/rdbms/admin/dbmslms.sql
@?/rdbms/admin/prvtlm.plb

开启最小补充日志

select SUPPLEMENTAL_LOG_DATA_MIN,SUPPLEMENTAL_LOG_DATA_PK,SUPPLEMENTAL_LOG_DATA_UI from v$database;

SQL> alter database add supplemental log data;

Database altered.

SQL> select SUPPLEMENTAL_LOG_DATA_MIN,SUPPLEMENTAL_LOG_DATA_PK,SUPPLEMENTAL_LOG_DATA_UI from v$database;

SUPPLEME SUP SUP
-------- --- ---
YES NO NO

LOGMNR 分析日志，需要创建一个数据字典，这个数据字典可以存储在外部文件（external file) 或者redo log 中。 如果要存储在外部文件中，数据库参数utl_file_dir 需要配置，并重启数据库。

SQL> alter system set utl_file_dir=‘*‘ scope=spfile;
SQL> shutdown immediate;
SQL> startup

SQL> show parameter utl_file

NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
utl_file_dir string *
SQL> execute dbms_logmnr_d.build(dictionary_filename=>‘dict.ora‘,dictionary_location=>‘/data/newdg/logminer_ctr_directory/‘);

PL/SQL procedure successfully completed.

 #或者使用redo log 存储数据字典

create table logmnr_04_14_one_date as select * from v$logmnr_contents;

结束

EXECUTE dbms_logmnr.end_logmnr;

5）SQL查询结果

startup mount;
flashback database to restore point flashback_dzswrac;
alter database convert to physical standby;
shutdown immediate;
startup mount;
alter database recover managed standby database disconnect from session;
--根据日志等信息，mgr确认已使用，且已恢复之后，在删除闪回日志，一定要确认完毕

DROP RESTORE POINT flashback_dzswrac;
alter database flashback off;
ALTER SYSTEM SET db_recovery_file_dest=‘‘ SCOPE=BOTH;
exit