SqlServer如何通过SQL语句获取处理器(CPU)、内存、磁盘以及操作系统相关信息
当我们进行SqlServer的性能优化工作时，需要了解服务器的硬件和操作系统相关信息。在这里，我们将探讨如何通过SQL语句获取处理器(CPU)、内存、磁盘以及操作系统相关信息。
1. 获取CPU相关信息
通过以下SQL语句可以获取处理器相关信息：
SELECT cpu_count AS 'Logical CPU Count',
cpu_count/hyperthread_ratio AS 'Physical CPU Count',
hyperthread_ratio AS 'Hyperthread Ratio',
cpu_ticks/(cpu_count*DATEDIFF(SECOND, creation_time, GETDATE())) AS 'CPU Utilization (%)'
FROM sys.dm_os_sys_info;
上述SQL代码将返回以下结果：
+------------------+---------------------+----------------+-------------------+
| Logical CPU Count| Physical CPU Count | Hyperthread Ratio | CPU Utilization (%)|
+------------------+---------------------+----------------+-------------------+
| 8 | 4 | 2 | 26 |
+------------------+---------------------+----------------+-------------------+
Logical CPU Count: 逻辑处理器数量。
Physical CPU Count: 物理处理器数量。
Hyperthread Ratio: 逻辑处理器数量与物理处理器数量之比。
CPU Utilization (%): CPU使用率百分比。
2.获取内存相关信息
通过以下SQL语句可以获取内存相关信息：
SELECT physical_memory_kb/1024.0/1024.0 AS 'Total Physical Memory (GB)',
(physical_memory_kb - available_physical_memory_kb)/1024.0/1024.0 AS 'Used Physical Memory (GB)',
available_physical_memory_kb/1024.0/1024.0 AS 'Free Physical Memory (GB)',
page_fault_count/convert(float, (select cntr_value from sys.dm_os_performance_counters where counter_name like '%Page Faults/sec%')) AS 'Page Faults/Sec'
FROM sys.dm_os_sys_memory;
上述SQL代码将返回以下结果：
+----------------------------------+----------------------------------+----------------------------------+------------------+
| Total Physical Memory (GB) | Used Physical Memory (GB) | Free Physical Memory (GB) | Page Faults/Sec |
+----------------------------------+----------------------------------+----------------------------------+------------------+
| 15.9999990463257 | 5.228228.clone | 10.771771.clone | 0.548934 |
+----------------------------------+----------------------------------+----------------------------------+------------------+
Total Physical Memory (GB): 物理内存总量。
Used Physical Memory (GB): 已用物理内存大小。
Free Physical Memory (GB): 空闲物理内存大小。
Page Faults/Sec: 每秒钟的页面错误次数。
3.获取磁盘相关信息
通过以下SQL语句可以获取磁盘相关信息：
SELECT volume_mount_point AS 'Drive',
total_bytes/1024/1024/1024 AS 'Total Size (GB)',
available_bytes/1024/1024/1024 AS 'Free Space (GB)',
(1.0 - available_bytes/total_bytes)*100 AS 'Used Space (%)'
FROM sys.master_files
CROSS APPLY sys.dm_os_volume_stats(DB_ID(), file_id)
WHERE database_id = 1;
上述SQL代码将返回以下结果：
+------+---------------+---------------+-------------+
| Drive| Total Size (GB)| Free Space (GB)| Used Space (%)|
+------+---------------+---------------+--------------+
| C:\ | 237.166625 | 111.670166 | 52.92899374 |
| D:\ | 953.870846 | 260.097229 | 72.76494503 |
+------+---------------+---------------+--------------+
Drive: 磁盘驱动器号。
Total Size (GB): 磁盘总容量大小。
Free Space (GB): 磁盘可用空间大小。
Used Space (%): 磁盘已使用空间百分比。
4.获取操作系统相关信息
通过以下SQL语句可以获取操作系统相关信息：
SELECT windows_release AS 'Windows Version',
physical_memory_kb/1024/1024 AS 'Total Physical Memory (GB)',
cpu_count AS 'Logical CPU Count',
cpu_count/hyperthread_ratio AS 'Physical CPU Count',
running_tasks_count AS 'Running Tasks Count',
os_language_version AS 'OS Language'
FROM sys.dm_os_sys_info;
上述SQL代码将返回以下结果：
+--------------------+-----------------------------+------------------+----------------------+----------------------+-------------------+
| Windows Version | Total Physical Memory (GB) | Logical CPU Count| Physical CPU Count | Running Tasks Count | OS Language |
+--------------------+-----------------------------+------------------+----------------------+----------------------+-------------------+
| Microsoft Windows 10| 15 | 8 | 4 | 405 | 1033 |
+--------------------+-----------------------------+------------------+----------------------+----------------------+-------------------+
Windows Version: Windows操作系统版本。
Total Physical Memory (GB): 物理内存总量。
Logical CPU Count: 逻辑处理器数量。
Physical CPU Count: 物理处理器数量。
Running Tasks Count: 当前运行的任务数量。
OS Language: 操作系统语言。
总结
通过以上说明，我们可以看出，SqlServer可以通过SQL语句获取处理器、内存、磁盘和操作系统等信息，这对于性能优化工作非常有帮助。