SQL SERVER 慢查询日志以及数据库内存占用情况_sql server 慢日志解析-优快云博客

本文链接：https://blog.youkuaiyun.com/sanpi199274/article/details/117263700

这篇博客关注SQL查询的性能，展示了如何通过查询系统视图获取执行时间、CPU使用、读写操作等信息，用于诊断和优化。同时，提供了查询数据库内存占用的方法，包括每个数据库的大小和SQL Server整体内存使用情况。

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SELECT
(total_elapsed_time / execution_count)/1000 N'平均时间ms'
,total_elapsed_time/1000 N'总花费时间ms'
,total_worker_time/1000 N'所用的CPU总时间ms'
,total_physical_reads N'物理读取总次数'
,total_logical_reads/execution_count N'每次逻辑读次数'
,total_logical_reads N'逻辑读取总次数'
,total_logical_writes N'逻辑写入总次数'
,execution_count N'执行次数'
,SUBSTRING(st.text, (qs.statement_start_offset/2) + 1,
((CASE statement_end_offset
WHEN -1 THEN DATALENGTH(st.text)
ELSE qs.statement_end_offset END
- qs.statement_start_offset)/2) + 1) N'执行语句'
,creation_time N'语句编译时间'
,last_execution_time N'上次执行时间'
FROM
sys.dm_exec_query_stats AS qs CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as st
WHERE
SUBSTRING(st.text, (qs.statement_start_offset/2) + 1,
((CASE statement_end_offset
WHEN -1 THEN DATALENGTH(st.text)
ELSE qs.statement_end_offset END
- qs.statement_start_offset)/2) + 1) not like '%fetch%'
and creation_time between '2012-05-07 01:35:00.000' and '2020-05-07 01:35:00.000'
ORDER BY
-- last_execution_time DESC
total_elapsed_time / execution_count DESC;

查看每个数据库对内存的占用

SELECT
ISNULL(DB_NAME(DATABASE_ID),'RESOURCEDB') AS DATABASENAME,
CAST(COUNT(ROW_COUNT) * 8.0 /(1024.0) AS DECIMAL(28,2)) AS 'SIZE(MB)'
FROM SYS.dm_os_buffer_descriptors
GROUP BY database_id
ORDER BY DATABASENAME

整个sql服务占用的总内存

SELECT SUM(single_pages_kb)+SUM(MULTI_PAGES_KB) FROM
(
SELECT
SUM(single_pages_kb) AS single_pages_kb
,SUM(MULTI_PAGES_KB) AS MULTI_PAGES_KB
FROM SYS.dm_os_memory_clerks
GROUP BY [TYPE]

) AS A
UNION
SELECT COUNT(ROW_COUNT) * 8.0 FROM SYS.dm_os_buffer_descriptors