如何增加ORACLE连接数-Mysql Tutorial-php.cn

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如何增加ORACLE连接数

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Jun 07, 2016 pm 05:45 PM

nbspprocess

ORACLE的连接数(sessions)与其参数文件中的进程数(process)有关，它们的关系如下：

    sessions=(1.1*process+5)

     但是我们增加process数时，往往数据库不能启动了。这因为我们还漏调了一个unix系统参数：它是/etc/system/ 中semmns,这是unix系统的信号量参数。每个process会占用一个信号量。semmns调整后，
需要重新启动unix操作系统，参数才能生效。不过它的大小会受制于硬件的内存或ORACLE SGA。范围
可从200——2000不等。

   semmns的计算公式为：SEMMNS>processes+instance_processes+system

   processes=数据库参数processes的值 instance_processes=5(smon,pmon,dbwr,lgwr,arch)

   system=系统所占用信号量。系统所占用信号量可用下列命令查出：#ipcs -sb

   其中列NSEMS显示系统已占用信号量。

   其它一些跟连接有关的参数，如 licence_max_sessions, licence_sessions_warning 等默认设置都为
零，也就是没有限制。我们可以放心大胆地使用数据库了

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