How is MSSQL using memory?
How is MSSQL using memory?
http://www.sqlhacks.com/Administration/Memory-Usage
Memory is one the most important factor affecting MSSQL performance.
As an administrator, you should be monitoring the memory
regularly. When Microsoft SQL Server runs out of memory, it will use
virtual memory: ie: disk paging, which will grind MSSQL to a halt.
You can keep track of the memory with dbcc memorystatus
.
Applies to:
Microsoft SQL Server 2005
Microsoft SQL Server 2008
Memorystatus
DBCC
MEMORYSTATUS
Memory Manager KB
------------------------------ --------------------
VM Reserved 538308
VM Committed 129888
AWE Allocated 0
Reserved Memory 1024
Reserved Memory In Use 0
(5 row(s) affected)
Memory node Id = 0 KB
------------------------------ --------------------
VM Reserved 534148
VM Committed 125880
AWE Allocated 0
MultiPage Allocator 7688
SinglePage Allocator 21808
(5 row(s) affected)
MEMORYCLERK_SQLGENERAL (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 0
VM Committed 0
AWE Allocated 0
SM Reserved 0
SM Commited 0
SinglePage Allocator 952
MultiPage Allocator 1544
(7 row(s) affected)
MEMORYCLERK_SQLBUFFERPOOL (Total) KB
---------------------------------------------------------------- --------------------
VM Reserved 523596
VM Co
相关文档：
基本原理
FreeTDS为Linux系统提供了TDS协议的开源客户端。由于MS SQL和Sybase使用的恰是TDS协议，所以在Linux中可以用FreeTDS连接MS SQL。
我们可以利用OpenOffice.Org Base及Linux ODBC实现可视化的数据库查看方式。方便个人用户使用Linux远程管理自己的数据库系统。
命令行方式使用方法简介
安装FreeTDS和sqsh
首先� ......
Ms sql 2000
drivername=com.microsoft.jdbc.sqlserver.SQLServerDriver
url=jdbc:microsoft:sqlserver://localhost:1433;DatabaseName=books
username=sa
password=sa
MySQL
drivername=com.mysql.jdbc.Driver
url=jdbc:mysql://localhost/books
username=root
password=root
Oracle
drivername=orac ......
--字段添加说明
EXEC sp_addextendedproperty 'MS_Description', '要添加的说明', 'user', dbo, 'table', 表名, 'column', 列名
--删除字段说明
EXEC sp_dropextendedproperty 'MS_Description', 'user', dbo, 'table', 表名, 'column', 字段名
--查看字段说明
SELECT
[Table Name] = i_s.TAB ......
锁机制
NOLOCK和READPAST的区别。
1. 开启一个事务执行插入数据的操作。
BEGIN TRAN t
INSERT INTO Customer
SELECT 'a','a'
2. 执行一条查询语句。
SELECT * from Customer WITH (NOLOCK)
结果中显示"a"和"a"。当1中事务回滚后，那么a将成为脏数据。(注:1中的事务未提交) 。NOLOCK表明没有对数据表添加共� ......
