MSSQL数据库占用内存过大造成服务器死机问题的解决方法
使用MSSQL的站长朋友都会被MSSQL数据库吃内存的能力佩服得五体投地,一个小小的网站,运行若干天之后,MSSQL就会把服务器上所有的内存都吃光,此时你不得不重新启动一下服务器或MSSQL来释放内存,有人认为是MSSQL有内存泄露问题,其实不然,微软给我们了明确说明:
使用MSSQL的站长朋友都会被MSSQL数据库吃内存的能力佩服得五体投地,一个小小的网站,运行若干天之后,MSSQL就会把服务器上所有的内存都吃光,此时你不得不重新启动一下服务器或MSSQL来释放内存,有人认为是MSSQL有内存泄露问题,其实不然,微软给我们了明确说明:
在您启动 SQL Server 之后，SQL Server 内存使用量将会持续稳定上升，即使当服务器上活动很少时也不会下降。另外，任务管理器和性能监视器将显示计算机上可用的物理内存稳定下降，直到可用内存降到 4 至 10 MB 为止。
仅仅出现这种状态不表示内存泄漏。此行为是正常的，并且是 SQL Server 缓冲池的预期行为。
默认情况下，SQL Server 根据操作系统报告的物理内存加载动态增大和收缩其缓冲池(缓存)的大小。只要有足够的内存可用于防止内存页面交换(在 4 至 10 MB 之间)，SQL Server 缓冲池就会继续增大。像在与 SQL Server 分配内存位于相同计算机上的其他进程一样，SQL Server 缓冲区管理器将在需要的时候释放内存。SQL Server 每秒可以释放和获取几兆字节的内存，从而使它可以快速适应内存分配变化。
更多信息
您可以通过服务器内存最小值和服务器内存最大值配置选项设置 SQL Server 数据库引擎使用的内存(缓冲池)量的上下限。在设置服务器内存最小值和服务器内存最大值选项之前，请查阅以下 Microsoft 知识库文章中标题为"内存"一节中的参考信息：
319942 HOW TO：Determine Proper SQL Server Configuration Settings(确定正确的 SQL Server 配置设置)
请注意，服务器内存最大值选项只限制 SQL Server 缓冲池的大小。服务器内存最大值选项不限制剩余的未保留内存区域，SQL Server 准备将该区域分配给其他组件，例如扩展存储过程、COM 对象、以及非共享 DLL、EXE 和 MAPI 组件。由于前面的分配，SQL Server 专用字节超过服务器内存最大值配置是很正常的。有关此未保留内存区域中分配的其他信息，请单击下面的文章编号，，以查看 Microsoft 知识库中相应的文章：
316749 PRB：在使用大量数据库时可能没有足够的虚拟内存
参考
SQL Server 联机图书;主题："服务器内存最小值和最大值的影响";"内存体系结构";"服务器内存选项";"SQL Server 内存池"
下面我们就来实战如何限制MSSQL内存使用:
第一步:打开企业管理双击进入要修改的MSSQL.
第二步:在左侧MSSQL上点击右键,选择属性,弹出SQL Server属性(配置)对话框
第三步:点击内存选项卡.
在这里,你会看到MSSQL默认设置为使用最大内存,也就是你所有的内存,根据你的需要,设置它的最大值吧.
第五步:设置完毕，关闭MSSQL服务再重启，配置即可生效!
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