Oracle 参数 LOG_ARCHIVE_CONFIG 官方解释,作用,如何配置最优化建议

本站中文解释

LOG_ARCHIVE_CONFIG参数是一个多重分类的参数,用于设置Oracle的归档模式。它主要由DESTINATION、ARCHIVELOG模式和归档选项组成。

DESTINATION:

DESTINATION参数决定Oracle归档日志文件存储位置,其可设定值是一个以逗号分隔开的多个字符串或路径,每一个代表一个归档日志文件存储目录。

ARCHIVELOG模式:

ARCHIVELOG模式决定Oracle归档模式的开关状态,它的可设定值有两个:ENABLE和DISABLE,ENABLE参数启动归档模式,DISABLE参数关闭归档模式。

归档选项:

归档选项是一组特定条件,系统根据这些条件决定归档日志文件到何处存储,参数可设定值有:MANDATORY、OPTIONAL、ALWAYS和NONE,MANDATORY参数表明该文件必须归档,OPTIONAL参数表明该文件应当根据业务情况归档,ALWAYS参数表明该文件必须归档,NONE参数表明该文件不归档。

设置正确的LOG_ARCHIVE_CONFIG参数:

要正确设置LOG_ARCHIVE_CONFIG,需要根据实际的业务需求配合ARCHIVELOG模式设定DESTINATION及归档选项,以确保Oracle系统中可用的所有日志文件都可以安全且方便地归档。

官方英文解释

LOG_ARCHIVE_CONFIG enables or disables the sending of redo logs to remote destinations and the receipt of remote redo logs, and specifies the unique database names (DB_UNIQUE_NAME) for each database in the Data Guard configuration.

Property Description

Parameter type

String

Syntax

LOG_ARCHIVE_CONFIG =

{ [ SEND | NOSEND ] [ RECEIVE | NORECEIVE ] [ DG_CONFIG=(remote_db_unique_name1 [, ... remote_db_unique_name30) | NODG_CONFIG ] }

Default value

NULL

Modifiable

ALTER SYSTEM

Modifiable in a PDB

No

Basic

No

Values

  • SEND

    Enables the sending of redo logs to remote destinations

  • NOSEND

    Disables the sending of redo logs to remote destinations

  • RECEIVE

    Enables the receipt of remotely archived redo logs

  • NORECEIVE

    Disables the receipt of remotely archived redo logs

  • DG_CONFIG

    Specifies a list of up to 30 unique database names (defined with the DB_UNIQUE_NAME initialization parameter) for all of the databases in the Data Guard configuration.

  • NODG_CONFIG

    Eliminates the list of service provider names previously specified with the DG_CONFIG option.

When this parameter has not been set, its default value is NULL. However, the NULL value is treated as if the parameter has been set to ‘SEND, RECEIVE, NODG_CONFIG’.


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