Oracle 参数 LOG_ARCHIVE_DEST_STATE_n 官方解释,作用,如何配置最优化建议
本站中文解释
参数
LOG_ARCHIVE_DEST_STATE_n参数用于设置Archive log模式下指定Archive log的目标状态,即指定使用哪些Archive log目标(destination),以及当前目标的状态及错误处理方式,每个Archive log目标(LOG_ARCHIVE_DEST_n)需要配一个对应的状态参数(LOG_ARCHIVE_DEST_STATE_n)。
LOG_ARCHIVE_DEST_STATE_n参数可以设置为下列三个可选值:
-ENABLE:启用状态,即当前Archive log目标将启用,Archiver进程可以将Archive log file写入该目标;
-DEFER:挂起状态,即当前Archive log目标将挂起,Archiver进程将不会写入该目标,直到被重启为ENABLE状态;
-DEFUNCT:被废弃状态,即当前Archive log目标已失效,Archiver进程不再将Archive log file写入该目标,必须重新配置该参数为ENABLE或DEFER状态,并设置一个新的Archive log目标参数(LOG_ARCHIVE_DEST_n),才能重新开始将Archive log写入新的目标。
正确设置LOG_ARCHIVE_DEST_STATE_n参数的方法:
1.计划好需要启用的Archive log目标,并在tnsnames.ora文件中完成网络配置。
2.在Oracle的init.ora参数文件或spfile.ora文件中,设置LOG_ARCHIVE_DEST_n参数,并指定LOG_ARCHIVE_DEST_STATE_n参数值为ENABLE。
3.完成参数配置后,重启Oracle数据库实例,以使其生效。
官方英文解释
The LOG_ARCHIVE_DEST_STATE_
n
parameters (where n
= 1, 2, 3, … 31) specify the availability state of the corresponding destination.
Property | Description |
---|---|
Parameter type |
String |
Syntax |
|
Default value |
|
Modifiable |
|
Modifiable in a PDB |
No |
Basic |
Yes |
The parameter suffix (1 through 31) specifies one of the corresponding LOG_ARCHIVE_DEST_
n
destination parameters.
Values
-
enable
Specifies that a valid log archive destination can be used for a subsequent archiving operation (automatic or manual). This is the default.
-
defer
Specifies that valid destination information and attributes are preserved, but the destination is excluded from archiving operations until reenabled.
-
alternate
Specifies that a log archive destination is not enabled but will become enabled if communications to another destination fail.
-
reset
Functions the same as
defer
, but clears any error messages for the destination if it had previously failed.
The LOG_ARCHIVE_DEST_STATE_
n
parameters have no effect on the ENABLE
state for the LOG_ARCHIVE_DEST
or LOG_ARCHIVE_DUPLEX_DEST
parameters.
The V$ARCHIVE_DEST
dynamic performance view shows values in use for the current session. The DEST_ID
column of that view corresponds to the archive destination suffix n
.
See Also:
-
Oracle Data Guard Concepts
and Administration for more information about this parameter -
“V$ARCHIVE_DEST”