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标题：ORA-01052: required destination LOG_ARCHIVE_DUPLEX_DEST is not specified 恢复思路

作者：惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]

今天一网友找到我,说数据库恢复在推scn的过程中遇到了ORA-01052: required destination LOG_ARCHIVE_DUPLEX_DEST is not specified错误无法解决,让我给予支持.这不禁让我想起,现在由于数据库bug和dblink原因导致了很多数据库scn很大,距离天花板非常近,从而使得数据库恢复过程中无法直接简单的推scn,这里正好结合该例子,简单说明下ORA-01052故障的处理.类似文档以前也写过:ORA-01052发生原因的类似文章

由于坏块导致数据库进行实例恢复无法进行

Beginning crash recovery of 1 threads
Started redo scan
Completed redo scan
 read 1901 KB redo, 276 data blocks need recovery
Started redo application at
 Thread 1: logseq 1004, block 172771
Recovery of Online Redo Log: Thread 1 Group 2 Seq 1004 Reading mem 0
  Mem# 0: F:\APP\ADMINISTRATOR\ORADATA\XFF\REDO02.LOG
Fri May 29 10:59:56 2015
RECOVERY OF THREAD 1 STUCK AT BLOCK 439938 OF FILE 19
Fri May 29 11:00:00 2015
Exception [type: ACCESS_VIOLATION, UNABLE_TO_READ] [ADDR:0x2048] [PC:0x6215134, __intel_new_memcpy()+260]
Fri May 29 11:00:12 2015
Trace dumping is performing id=[cdmp_20150529110012]
Fri May 29 11:00:12 2015
Slave exiting with ORA-1172 exception
Errors in file f:\app\administrator\diag\rdbms\XFF\XFF\trace\XFF_p007_1612.trc:
ORA-01172: 线程 1 的恢复停止在块 439938 (在文件 19 中)
ORA-01151: 如果需要, 请使用介质恢复以恢复块和还原备份
Fri May 29 11:00:27 2015
ORA-01578: ORACLE 数据块损坏 (文件号 19, 块号 450245)
ORA-01110: 数据文件 19: 'F:\APP\ADMINISTRATOR\ORADATA\XFF\PSTORE_02.DBF'
ORA-10564: tablespace PSTORE
ORA-01110: 数据文件 19: 'F:\APP\ADMINISTRATOR\ORADATA\XFF\PSTORE_02.DBF'
ORA-10561: block type 'TRANSACTION MANAGED INDEX BLOCK', data object# 91642
ORA-00607: 当更改数据块时出现内部错误
ORA-00602: 内部编程异常错误
ORA-07445: 出现异常错误: 核心转储 [_intel_new_memcpy()+260] [ACCESS_VIOLATION] [ADDR:0x2048] 
[PC:0x6215134] [UNABLE_TO_READ] []
Fri May 29 11:00:27 2015
Aborting crash recovery due to slave death, attempting serial crash recovery
RECOVERY OF THREAD 1 STUCK AT BLOCK 439938 OF FILE 19
Fri May 29 11:00:45 2015
Trace dumping is performing id=[cdmp_20150529110045]
Aborting crash recovery due to error 1172
ORA-1172 signalled during: alter database open...

设置_allow_resetlogs_corruption并resetlogs尝试打开数据库

Assigning activation ID 4272042346 (0xfea2316a)
Thread 1 opened at log sequence 1
  Current log# 1 seq# 1 mem# 0: F:\APP\ADMINISTRATOR\ORADATA\XFF\REDO01.LOG
Successful open of redo thread 1
MTTR advisory is disabled because FAST_START_MTTR_TARGET is not set
Fri May 29 11:30:47 2015
SMON: enabling cache recovery
Fri May 29 11:30:47 2015
Errors in file f:\app\administrator\diag\rdbms\XFF\XFF\trace\XFF_ora_3004.trc  (incident=181236):
ORA-00600: ??????, ??: [2662], [3360], [2233437186], [3360], [2235447064], [4194545], [], [], [], [], [], []
Incident details in: f:\app\administrator\diag\rdbms\XFF\XFF\incident\incdir_181236\XFF_ora_3004_i181236.trc
Errors in file f:\app\administrator\diag\rdbms\XFF\XFF\trace\XFF_ora_3004.trc:
ORA-00704: ????????
ORA-00704: ????????
ORA-00600: ??????, ??: [2662], [3360], [2233437186], [3360], [2235447064], [4194545], [], [], [], [], [], []
Errors in file f:\app\administrator\diag\rdbms\XFF\XFF\trace\XFF_ora_3004.trc:
ORA-00704: ????????
ORA-00704: ????????
ORA-00600: ??????, ??: [2662], [3360], [2233437186], [3360], [2235447064], [4194545], [], [], [], [], [], []
Error 704 happened during db open, shutting down database
USER (ospid: 3004): terminating the instance due to error 704
Instance terminated by USER, pid = 3004
ORA-1092 signalled during: alter database open resetlogs...
opiodr aborting process unknown ospid (3004) as a result of ORA-1092

这里可以看到数据库通过设置_allow_resetlogs_corruption参数，进行不完全恢复,跳过数据库启动的实例恢复,然后强制拉库,然后遭遇大家熟悉的ORA-600[2662]错误,使得恢复失败,根据经验,通过推scn来绕过该错误

使用_minimum_giga_scn尝试推SCN

SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
 
--------------------------------
*._minimum_giga_scn=13443
--------------------------------
 
SQL> startup pfile='/tmp/pfile'
ORACLE instance started.
 
Total System Global Area  236000356 bytes
Fixed Size                   451684 bytes
Variable Size             201326592 bytes
Database Buffers           33554432 bytes
Redo Buffers                 667648 bytes
Database mounted.
ORA-01052: required destination LOG_ARCHIVE_DUPLEX_DEST is not specified

通过运行Oracle Database Recovery Check检查发现数据库的scn已经非常大,距离天花板较近

这里最大允许的推进的scn为13442.7,但是常规的最小的推scn的方法最小值为1024*1024*1024的倍数,因此这里遇到麻烦.
这里数据库遭遇了ORA-01052错误,导致推scn不成功,数据库无法正常启动.出现这类情况,由于scn可以增加的空间非常小,因此可以使用使用oradebug修改数据库scn或者直接修改控制文件scn的方式来精确控制推scn的值(可以实现任何值的scn增加,只要不超过天花板),也可以通过方法修改数据库scn距离天花板的距离,从而实现大幅度使用_minimum_giga_scn来推scn.另外还有一种解决方法:由于ORA-01052是由于scn过大导致(超过了数据库现在的天花板scn),因此出现了ORA-01052.所以另外一种变通的方法,就是通过调整数据库的天花板scn,从而使得_minimum_giga_scn可以继续推scn.在本次恢复中使用最为简单的增加天花板scn的方式来恢复(不过该方法恢复之后需要重建库,其实已经使用了隐含参数屏蔽redo恢复,本身就建议重建库保证数据字典一致性)

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标题：ORA-01052: required destination LOG_ARCHIVE_DUPLEX_DEST is not specified

作者：惜分飞©版权所有[未经本人同意,不得以任何形式转载,否则有进一步追究法律责任的权利.]

SCN说明
1、Oracle的SCN在每秒16384次commit的情况下可以维持534年，每秒16384次commit是Oracle早先认为的任何系统的极限commit强度；
2、Oracle里SCN的起点是1988年1月1日；
3、_minimum_giga_scn=n的含义是把SCN往前推进到nG，但请注意，只有在SCN小于nG的时候才会用到这个隐含参数，反之则Oracle会置这个隐含参数于不顾。

求模拟_minimum_giga_scn值
这里通过时间差，大概的模拟_minimum_giga_scn小于当前时间和1988年1月1日的scn最大值(300>290)

SQL> select to_char(sysdate,'yyyy-mm-dd hh24:mi:ss')from dual;

TO_CHAR(SYSDATE,'YYYY-MM-DDHH24:MI:SS'
--------------------------------------
2012-03-18 04:27:50


SQL> select months_between(sysdate,to_date('19880101','yyyymmdd')) from dual;

MONTHS_BETWEEN(SYSDATE,TO_DATE('19880101','YYYYMMDD'))
------------------------------------------------------
                                             290.55443

SQL> select 16384*60*60*24*31*300/(1024*1024*1024) SCN from dual;

       SCN
----------
12260.7422

启动数据库测试

SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.

--------------------------------
*._minimum_giga_scn=12260
--------------------------------

SQL> startup pfile='/tmp/pfile'
ORACLE instance started.

Total System Global Area  236000356 bytes
Fixed Size                   451684 bytes
Variable Size             201326592 bytes
Database Buffers           33554432 bytes
Redo Buffers                 667648 bytes
Database mounted.
ORA-01052: required destination LOG_ARCHIVE_DUPLEX_DEST is not specified

分析ORA-01052

SQL> !oerr ora 1052
01052, 00000, "required destination LOG_ARCHIVE_DUPLEX_DEST is not specified"
// *Cause:  A valid destination for parameter LOG_ARCHIVE_DUPLEX_DEST was not
//          specified when parameter LOG_ARCHIVE_MIN_SUCCEED_DEST was set to
//          two.
// *Action: Either specify a value for parameter LOG_ARCHIVE_DUPLEX_DEST, or
//          reduce the value for parameter LOG_ARCHIVE_MIN_SUCCEED_DEST to one.

SQL> show parameter LOG_ARCHIVE_DUPLEX_DEST;

NAME                                 TYPE       VALUE
------------------------------------ ---------- ------------------------------
log_archive_duplex_dest              string
SQL> show parameter LOG_ARCHIVE_MIN_SUCCEED_DEST

NAME                                 TYPE       VALUE
------------------------------------ ---------- ------------------------------
log_archive_min_succeed_dest         integer    1

这里可以看出，不是以为我上面的两个参数设置错误导致ORA-01052，而是因为推进scn过大导致ORA-01052的错误

减小_minimum_giga_scn测试
这里选择_minimum_giga_scn小于当前时间和1988年1月1日的scn最大值(280<290)

SQL>  select 16384*60*60*24*31*280/(1024*1024*1024) SCN from dual;

       SCN
———-
11443.3594

SQL> shutdown immediate
ORA-01109: database not open


Database dismounted.
ORACLE instance shut down.

—————————–
*._minimum_giga_scn=11443
—————————–


SQL> startup pfile=’/tmp/pfile’
ORACLE instance started.

Total System Global Area  236000356 bytes
Fixed Size                   451684 bytes
Variable Size             201326592 bytes
Database Buffers           33554432 bytes
Redo Buffers                 667648 bytes
Database mounted.
Database opened.

SQL> select to_char(dbms_flashback.get_system_change_number(),
2    ’9999999999999999′) from dual;

TO_CHAR(DBMS_FLASHBACK.GET_SYSTEM_
———————————-
   12286827692251

SQL> select dbms_flashback.get_system_change_number()/(1024*1024*1024) from dual;

DBMS_FLASHBACK.GET_SYSTEM_CHANGE_NUMBER()/(1024*1024*1024)
———————————————————-
                                                     11443

通过试验可以发现，在我们的数据库遇到异常，需要恢复通过推进scn来恢复的时候，不是推进的越大越好；如果推进的太大可能导致ORA-01052错误，一般建议是比当前不一致的scn稍微大一点
参考:http://www.dbsnake.net/two-scn-internal-points.html