卸载SQL SERVER 数据库可能很多人都做过，但是我们需要注意，有时候可能没有完全卸载干净。当然SQL SERVER不像ORACLE数据库，卸载不干净也完全可以重新安装，可能会出现安装不成功的情况，那么如何完全卸载数据库呢？下面的操作环境以WIN2008 + SQL SERVER 2
卸载SQL SERVER 数据库可能很多人都做过，但是我们需要注意，有时候可能没有完全卸载干净。当然SQL SERVER不像ORACLE数据库，卸载不干净也完全可以重新安装，可能会出现安装不成功的情况，那么如何完全卸载数据库呢？下面的操作环境以WIN2008 + SQL SERVER 2008 R2为例来实验一下：
步骤1： 关闭SQL SERVER的所有服务。
步骤2： 若要开始卸载过程，请从“开始”菜单单击“控制面板”，然后双击“程序和功能”。选择要卸载的 SQL Server 组件，然后单击“卸载”。
步骤3： 此时将启动 SQL Server 安装向导，点击Remove按钮，即可开始卸载SQL SERVER 2008了。
步骤4: 如图所示，点击下一步(Next)即可，如果在服务器上有多个实例，你可以在下拉列表中选择需要卸载的数据库实例。
步骤5： 选择要卸载的组件。一般默认选择全部。这样你就可以删除所有组件。
步骤6： 点击下一步。
步骤7： 在“准备卸载”页上查看要卸载的组件和功能的列表。接下来“安装进度”页将显示安装状态。最后在“完成安装”页上单击“关闭”退出安装向导。
步骤8： 删除成功，重复步骤 2-7，直到删除所有 SQL Server 2008 组件。
执行上面步骤后，你需要在控制面板查看是否还有没有删除的SQL SERVER组件，然后手工卸载下面一些目录：
C:\Program Files\Microsoft SQL Server
C:\Program Files (x86)\Microsoft SQL Server
然后是清除注册表信息
（1） 删除以下注册表子项：
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSSQLServer
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\ Microsoft SQL Server
（在我的操作中，注册表中没有看到下面信息，应该是卸载时，已经被清除了）
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSSQLServer
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SQLSERVER AGENT
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\SQLBrowser
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\MSSQLServerADHelper100
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\services\MSSQLServerOLAPService
在系统为WIN7的SQL SERVER 2008下，我们还可以看到下面一些注册表的信息，如果你看到它的存在，也要清除这些注册表信息。
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server 2005 Redist
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server 2008 Redist
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server Compact Edition
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server Native Client 10.0
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Sync Framework
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Sync Services
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft Sync Services ADO
（2） 如果有安装Microsoft Search 服务，还需要删除：
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Search
（3） 卸载Microsoft 全文查询（没有安装则不需要），虚拟主机，虚拟主机，还需要删除：
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSFTPSVC
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSSCNTRS
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSSEARCH
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSSGATHERVER
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSSGTHRSVC
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSSINDEX
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