ORA-19812: cannot use string without DB_RECOVERY_FILE_DEST

文档解释

ORA-19812: cannot use string without DB_RECOVERY_FILE_DEST

Cause: There are three possible cause for this error: 1) The indicated parameter was in use when no DB_RECOVERY_FILE_DEST parameter was encountered while fetching the initialization parameter. 2) An attempt was made to set indicated the parameter with the ALTER SYSTEM command when no DB_RECOVERY_FILE_DEST was in use. 3) An attempt was made to clear DB_RECOVERY_FILE_DEST with the ALTER SYSTEM command when the indicated parameter was in use.

Action: Eliminate any incompatible parameter definitions.

ORA-19812:cannot use string without DB_RECOVERY_FILE_DEST 是一个错误文件,指的是尝试在未设置 DB_RECOVERY_FILE_DEST 环境变量时进行自动恢复操作,而此操作在无 DB_RECOVERY_FILE_DEST 的情况下是不可行的。

官方解释

本错误表明尝试在 Oracle 数据库中进行自动恢复操作,而 DB_RECOVERY_FILE_DEST 环境变量未设置或未指定正确值。如果 DB_RECOVERY_FILE_DEST 变量未设置,则无法进行自动恢复操作,将会抛出此错误。

常见案例

当使用 RMAN 备份数据库时,如果 Oracle 进程没有正确设置 DB_RECOVERY_FILE_DEST 环境变量,则在尝试备份时会抛出 ORA-19812 错误。

一般处理方法及步骤

1. 确认参数 NC_DVP_ENABLED, DB_RECOVERY_FILE_DEST 及 DB_RECOVERY_FILE_DEST_SIZE 是否正确配置,具体配置步骤可参考 Oracle 文档: Manage Automatic Undo Management with RMAN。

2. 正确设置 RMAN 备份策略及数据恢复策略,具体步骤可参考 Oracle 文档:Manage Automatic Undo Management with RMAN。

3. 使用 RMAN 全备及是否允许增量备份,可参考 Oracle 文档:Manage Automatic Undo Management with RMAN。

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