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ORA-15239: allocation unit size higher than string requires RDBMS compatibility string ORACLE 报错 故障修

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ORA-15239: allocation unit size higher than string requires RDBMS compatibility string ORACLE 报错 故障修

文档解释

ORA-15239: allocation unit size higher than string requires RDBMS compatibility string

Cause: The allocation unit size requested exceeded the limit imposed by the RDBMS compatibility setting.

Action: Use a smaller allocation unit size or specify a higher RDBMS compatibility setting.

错误:ORA-15239: allocation unit size higher than string requires RDBMS compatibility string

官方解释

备份恢复完成后,当从兼容级别较高的 Oracle 数据库(如9.2.0.4)转移到先前兼容级别低的 Oracle 数据库(如8.1.7)环境时,可能会收到此错误消息(ORA-15239)。

原因:当在 Oracle 数据库环境中运行 RMAN 备份时,可能会返回错误 ORA-15239,并且备份将不完整。此错误通常表明,存储块的分派单元的大小超过了 ORA_RDBMS_COMPATIBILITY 参数所允许的最大分配单元大小。.

常见案例

一般处理方法及步骤

1. 检查备份恢复目标数据库上的 ORA_RDBMS_COMPATIBILITY 数据库参数设置并更改它们,以符合该分配单元大小。

2. 用于集成分拆或数据转移的 RMAN DUPLEX 命令:DUPLEX 命令从源库备份文件中创建分拆或转移到目标库的恢复任务。

3. 我们可以运行以下语句以更改参数:ALTER SYSTEM SET ORA_RDBMS_COMPATIBILITY=”string1″ scope=spfile;

4. 在数据库上运行重启命令(SHUTDOWN IMMEDIATE 和 STARTUP)来应用更改。

5. 再次备份数据并备份之后,尝试恢复,以便检查是否可以恢复成功。

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ORA-15239: allocation unit size higher than string requires RDBMS compatibility string ORACLE 报错 故障修

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