什么?有个 SQL 执行了 8 秒!
哪里出了问题?臣妾不知道啊,得找 DBA 啊。
DBA 人呢?离职了!!擦!!!
程序员在无处寻求帮助时,就得想办法自救,努力让自己变成 "伪 DBA"。
索引
- 获取存储过程 SP 执行次数排名
- 查看哪个 SP 执行的平均时间最长
- 查看哪个 SP 执行的平均时间最不稳定
- 查看哪个 SP 耗费了最多的 CPU 时间
- 查看哪个 SP 执行的逻辑读最多
- 查看哪个 SP 执行的物理读最多
- 查看哪个 SP 执行的逻辑写最多
获取存储过程 SP 执行次数排名
SELECT TOP (100) p.[name] AS [SP Name]
,qs.execution_count
,ISNULL(qs.execution_count / DATEDIFF(Minute, qs.cached_time, GETDATE()), 0) AS [Calls/Minute]
,qs.total_worker_time / qs.execution_count AS [AvgWorkerTime]
,qs.total_worker_time AS [TotalWorkerTime]
,qs.total_elapsed_time
,qs.total_elapsed_time / qs.execution_count AS [avg_elapsed_time]
,qs.cached_time
FROM sys.procedures AS p WITH (NOLOCK)
INNER JOIN sys.dm_exec_procedure_stats AS qs WITH (NOLOCK) ON p.[object_id] = qs.[object_id]
WHERE qs.database_id = DB_ID()
ORDER BY qs.execution_count DESC
OPTION (RECOMPILE);
查看哪个 SP 执行的平均时间最长
SELECT TOP (25) p.[name] AS [SP Name]
,qs.total_elapsed_time / qs.execution_count AS [avg_elapsed_time]
,qs.total_elapsed_time
,qs.execution_count
,ISNULL(qs.execution_count / DATEDIFF(Minute, qs.cached_time, GETDATE()), 0) AS [Calls/Minute]
,qs.total_worker_time / qs.execution_count AS [AvgWorkerTime]
,qs.total_worker_time AS [TotalWorkerTime]
,qs.cached_time
FROM sys.procedures AS p WITH (NOLOCK)
INNER JOIN sys.dm_exec_procedure_stats AS qs WITH (NOLOCK) ON p.[object_id] = qs.[object_id]
WHERE qs.database_id = DB_ID()
ORDER BY avg_elapsed_time DESC
OPTION (RECOMPILE);
查看哪个 SP 执行的平均时间最不稳定
SELECT TOP (25) p.[name] AS [SP Name]
,qs.execution_count
,qs.min_elapsed_time
,qs.total_elapsed_time / qs.execution_count AS [avg_elapsed_time]
,qs.max_elapsed_time
,qs.last_elapsed_time
,qs.cached_time
FROM sys.procedures AS p WITH (NOLOCK)
INNER JOIN sys.dm_exec_procedure_stats AS qs WITH (NOLOCK) ON p.[object_id] = qs.[object_id]
WHERE qs.database_id = DB_ID()
ORDER BY avg_elapsed_time DESC
OPTION (RECOMPILE);
查看哪个 SP 耗费了最多的 CPU 时间
SELECT TOP (25) p.[name] AS [SP Name]
,qs.total_worker_time AS [TotalWorkerTime]
,qs.total_worker_time / qs.execution_count AS [AvgWorkerTime]
,qs.execution_count
,ISNULL(qs.execution_count / DATEDIFF(Minute, qs.cached_time, GETDATE()), 0) AS [Calls/Minute]
,qs.total_elapsed_time
,qs.total_elapsed_time / qs.execution_count AS [avg_elapsed_time]
,qs.cached_time
FROM sys.procedures AS p WITH (NOLOCK)
INNER JOIN sys.dm_exec_procedure_stats AS qs WITH (NOLOCK) ON p.[object_id] = qs.[object_id]
WHERE qs.database_id = DB_ID()
ORDER BY qs.total_worker_time DESC
OPTION (RECOMPILE);
查看哪个 SP 执行的逻辑读最多
SELECT TOP (25) p.[name] AS [SP Name]
,qs.total_logical_reads AS [TotalLogicalReads]
,qs.total_logical_reads / qs.execution_count AS [AvgLogicalReads]
,qs.execution_count
,ISNULL(qs.execution_count / DATEDIFF(Minute, qs.cached_time, GETDATE()), 0) AS [Calls/Minute]
,qs.total_elapsed_time
,qs.total_elapsed_time / qs.execution_count AS [avg_elapsed_time]
,qs.cached_time
FROM sys.procedures AS p WITH (NOLOCK)
INNER JOIN sys.dm_exec_procedure_stats AS qs WITH (NOLOCK) ON p.[object_id] = qs.[object_id]
WHERE qs.database_id = DB_ID()
ORDER BY qs.total_logical_reads DESC
OPTION (RECOMPILE);
逻辑读(Logical Read)主要是给 Memory 形成压力,可用于观察比较 Memory 运行情况。
查看哪个 SP 执行的物理读最多
SELECT TOP (25) p.[name] AS [SP Name]
,qs.total_physical_reads AS [TotalPhysicalReads]
,qs.total_physical_reads / qs.execution_count AS [AvgPhysicalReads]
,qs.execution_count
,qs.total_logical_reads
,qs.total_elapsed_time
,qs.total_elapsed_time / qs.execution_count AS [avg_elapsed_time]
,qs.cached_time
FROM sys.procedures AS p WITH (NOLOCK)
INNER JOIN sys.dm_exec_procedure_stats AS qs WITH (NOLOCK) ON p.[object_id] = qs.[object_id]
WHERE qs.database_id = DB_ID()
AND qs.total_physical_reads > 0
ORDER BY qs.total_physical_reads DESC
,qs.total_logical_reads DESC
OPTION (RECOMPILE);
物理读(Physical Read)主要是给磁盘 I/O 形成压力,可以用于观察比较 I/O 运行情况。
查看哪个 SP 执行的逻辑写最多
SELECT TOP (25) p.[name] AS [SP Name]
,qs.total_logical_writes AS [TotalLogicalWrites]
,qs.total_logical_writes / qs.execution_count AS [AvgLogicalWrites]
,qs.execution_count
,ISNULL(qs.execution_count / DATEDIFF(Minute, qs.cached_time, GETDATE()), 0) AS [Calls/Minute]
,qs.total_elapsed_time
,qs.total_elapsed_time / qs.execution_count AS [avg_elapsed_time]
,qs.cached_time
FROM sys.procedures AS p WITH (NOLOCK)
INNER JOIN sys.dm_exec_procedure_stats AS qs WITH (NOLOCK) ON p.[object_id] = qs.[object_id]
WHERE qs.database_id = DB_ID()
AND qs.total_logical_writes > 0
ORDER BY qs.total_logical_writes DESC
OPTION (RECOMPILE);
逻辑写(Logical Write)即与 Memory 相关,也与 Disk I/O 相关。通过数据可以判断出写 I/O 最昂贵的存储过程。
《人人都是 DBA》系列文章索引:
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本系列文章《人人都是 DBA》由 Dennis Gao 发表自博客园,未经作者本人同意禁止任何形式的转载,任何自动或人为的爬虫转载行为均为耍流氓。