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ORA-12806: could not get background process to hold enqueue ORACLE 报错 故障修复 远程处理

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ORA-12806: could not get background process to hold enqueue ORACLE 报错 故障修复 远程处理

文档解释

ORA-12806: could not get background process to hold enqueue

Cause: Internal error.

Action: This error should not normally occur. If it persists, contact Oracle Support Services.

ORA-12806错误是一种通用编程错误,说明在尝试使用enqueue过程时,工具未能获得一个能够作为保持enqueue的后台进程。

Oracle官方对于ORA-12806错误的解释是:检查并增加特定数据库上可获得的后台进程数量,以确保能够获得enqueue。

触发ORA-12806错误的常见案例有:

(1)Oracle在尝试获取enqueue时,后台进程不足;

(2)有数据库异常活动(包括逻辑备份运行或其他已知进程消耗)占用大量后台进程;

(3)在尝试获取enqueue时,enqueue正在被另一进程占有;

正常处理方法及步骤

(1)检查init.ora文件确定enqueue_processes参数是否低于运行中的数据库活动所需要的最小值,如果是,就需要增大该参数;

(2)挂起当前可能占有锁的进程,以释放enqueue;

(3)创建一个新的会话执行“Alter system set events”语句;

(4)用“Select status from v$lock”检查是否存在锁等待;

(5)把当前存在的enqueue跟踪到原始请求所在的会话;

(6)取消对原请求的执行,或者对现行的控制文件和日志文件进行备份?

(7)从数据库实例中关闭处于不活动状态的会话,避免继续占用enqueue;

(8)尝试关闭数据库实例并启动;

(9)重新连接到数据库,以确保enqueue在启动时被正确初始化;

(10)检查数据库实例是否正常,以确保可以使用enqueue功能。

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ORA-12806: could not get background process to hold enqueue ORACLE 报错 故障修复 远程处理

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