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ORA-12229: TNS:Interchange has no more free connections ORACLE 报错 故障修复 远程处理

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ORA-12229: TNS:Interchange has no more free connections ORACLE 报错 故障修复 远程处理

文档解释

ORA-12229: TNS:Interchange has no more free connections

Cause: One or more Interchanges along the path to the destination desired has no more free connections available to be used for this call.

Action: Try again later when the Interchanges are less busy, or contact your network administrator to have him determine which interchange it is, and increase the number of connections available on that interchange.

ORA-12229错误是指TNS(Transparent Network Substrate)交换器没有可用的连接。

官方解释

ORA-12229错误不是数据库错误,而是TNS错误。TNS交换器用于处理进程之间的连接,当TNS交换器的可用连接不足时,就会出现ORA-12229错误。

常见案例

在当前ORACLE SESSION中,如果有大量的连接请求,可能会触发ORA-12229错误。这种情况通常会发生在集群环境,如RAC(Real Application Cluster),特别是当节点之间的连接请求比较多的时候。

正常处理方法及步骤

1. 检查参数“PROCESSES”值是否设置正确。可以通过命令“show parameter process”来查看其设置值。

2. 检查已经打开的连接,关闭不再需要的连接和线程,来释放可用连接数量。

3. 检查添加了新的实例,是否需要增加“PROCESSES”属性。

4. 如果没有重启数据库,也可以尝试重新分配等待队列和连接队列,使连接分配更加公平,来避免该错误的出现。可以使用命令“alter system anc_PNRESET”来重置等待队列和连接队列。

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ORA-12229: TNS:Interchange has no more free connections ORACLE 报错 故障修复 远程处理

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