LOG_ARCHIVE_MIN_SUCCEED_DEST


LOG_ARCHIVE_MIN_SUCCEED_DEST

defines the minimum number of destinations that must succeed in order for the online logfile to be available for reuse.

• If you are using the
  
LOG_ARCHIVE_DEST_



n


  parameters and automatic archiving is enabled, the value of this parameter cannot exceed either of the following:

  – The total number of destinations

  – The number of enabled, valid destinations specified as
  
MANDATORY

  plus the number of enabled, valid non-standby destinations specified as
  
OPTIONAL


• If you are using
  
LOG_ARCHIVE_DEST

  and
  
LOG_ARCHIVE_DUPLEX_DEST

  and automatic archiving is enabled, a value of
  
1

  specifies that the destination specified in
  
LOG_ARCHIVE_DEST

  must succeed. A value of
  
2

  specifies that the destinations specified in both parameters must succeed.

If the value of this parameter is less than the number of enabled, valid

MANDATORY

destinations, this parameter is ignored in favor of the

MANDATORY

destination count. If the value is more than the number of enabled, valid

MANDATORY

destinations, some of the enabled, valid

OPTIONAL

non-standby destinations are treated as

MANDATORY

.

You can switch dynamically from using the older parameters to the

LOG_ARCHIVE_DEST_



n


parameter using

ALTER SYSTEM

, as follows:

1. Set
   
LOG_ARCHIVE_MIN_SUCCEED_DEST

   to
   
1

   .

2. Set the value of
   
LOG_ARCHIVE_DEST

   and
   
LOG_ARCHIVE_DUPLEX_DEST

   to the null string.

3. Set the desired number of destinations for the
   
LOG_ARCHIVE_DEST_



n


   parameters.

4. Reset
   
LOG_ARCHIVE_MIN_SUCCEED_DEST

   to the desired value.

boson总在http://www.itpub.net/thread-912877-1-1.html上说：

如归档路径参数设置为：

log_archive_dest_1=”LOCATION=/archive MANDATORY REOPEN”

log_archive_dest_2=”SERVICE=standby_db1 OPTIONAL”

log_archive_dest_3=”LOCATION=/archive2 OPTIONAL”

则log_archive_dest_1必须归档成功（MANDATORY），log_archive_dest_2、 log_archive_dest_3中必须有一个归档成功（log_archive_min_succeed_dest=2）后才能覆写联机日志文件。 同样，如果log_archive_dest_n中的MANDATORY关键字个数大于log_archive_min_succeed_dest，则 log_archive_min_succeed_dest的设置不起作用。

[@more@]

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