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Oracle XDB和XPT

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Release： 2016-06-07 17:32:24
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数据库在shutdown状态下，仅有PLSExtProc服务，且处于未知状态。数据库在nomount状态下，有SID、SIDXDB、SID_XPT、PLSExtProc服务

数据库在shutdown状态下，仅有PLSExtProc服务，且处于未知状态。

数据库在nomount状态下，有SID、SIDXDB、SID_XPT、PLSExtProc服务，其中，SID、SIDXDB、SID_XPT服务处于就绪/准备状态，PLSExtProc处于未知状态。

下面分别介绍各个服务的作用：

SID：启动数据库实例的服务

SIDXDB：高效处理XML数据的服务，，默认会占用8080端口。

SID_XPT：为DG准备的服务，DB BROKER会用到，如果不用DG可以删掉。

PLSExtProc：PL/SQL调用外部接口(C、JAVA编写的过程)的服务——容易受攻击

如何在监听启动时不再启动PLSExtProc服务：直接从listerner.ora中移除该项。

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