解决Performance Dashboard 两个datetime 列的差别导致了运行时溢出

原文出处：http://dbaonline.wordpress.com/2008/07/10/troubleshooting-sql-2005-performance-dashboard/

Joe.TJ翻译整理。

在使用SMSS Performance Dashboard 时，也许会出现一些问题。在MSDN上找到一些问题的解决方案。但是它们的思路不清晰，所以我就收集起来整理成一个清晰的描述。

注意：在尝试这些解决方案前请备份你的文件，并自负风险。

  问题一： 两个 datetime 列的差别导致了运行时溢出

   打开 C:\Program Files\Microsoft SQL Server\90\Tools\PerformanceDashboard\setup.sql.搜索以下代码：

sum(convert(bigint, datediff(ms, login_time, getdate()))) – sum(convert(bigint, s.total_elapsed_time)) as idle_connection_time,

并用以下代码行替代：

  sum(convert(bigint, CAST ( DATEDIFF ( minute, login_time, getdate()) AS BIGINT)*60000 + DATEDIFF ( millisecond, DATEADD ( minute, DATEDIFF ( minute, login_time, getdate() ), login_time ),getdate() ))) – sum(convert(bigint, s.total_elapsed_time)) as idle_connection_time,

  问题二：蓝色区域问题（当Server连续运行超过24天）

   打开C:\Program Files\Microsoft SQL Server\90\Tools\PerformanceDashboard\recent_cpu.rdl.

删除3271到3306行，并用下面的代码替代它们：

from (select s.session_id,
r.request_id,
s.login_time,
– s.host_name,
s.program_name,
s.login_name,
s.status as session_status,
s.last_request_start_time,
s.last_request_end_time,
s.cpu_time as session_cpu_time,
r.cpu_time as request_cpu_time,
– s.logical_reads as session_logical_reads,
– r.logical_reads as request_logical_reads,
r.start_time as request_start_time,
r.status as request_status,
r.command,
master.dbo.fn_varbintohexstr(r.sql_handle) as sql_handle,
master.dbo.fn_varbintohexstr(r.plan_handle) as plan_handle,
r.statement_start_offset,
r.statement_end_offset,
case
– Steve: Fixes begin here:
when convert(bigint, CAST ( DATEDIFF ( minute, start_time, getdate()) AS BIGINT)*60000 + DATEDIFF ( millisecond,
DATEADD ( minute,DATEDIFF ( minute, start_time, getdate() ), Start_time ),getdate() ))
> 0
then convert(float, r.cpu_time) / convert(bigint, CAST ( DATEDIFF ( minute, start_time, getdate()) AS BIGINT)*60000
+ DATEDIFF ( millisecond, DATEADD ( minute, DATEDIFF ( minute, start_time, getdate() ), Start_time ),getdate() )) else convert(float, 1.0) end
as avg_request_cpu_per_ms,
isnull (datediff(ms, case when r.start_time < @WithActivitySince then @WithActivitySince else r.start_time end, getdate()), 0)
as request_ms_in_window,
case when s.login_time > getdate() then convert(float, s.cpu_time) / (datediff(dd, s.login_time, getdate()) * cast(86400000 as bigint) + datediff(ms, dateadd(dd, datediff(dd, s.login_time, getdate()), s.login_time), getdate())) else convert(float, 1.0)
end as avg_session_cpu_per_ms,
convert(bigint,isnull(datediff(s, case when s.login_time < @WithActivitySince then @WithActivitySince else s.login_time end, case when r.request_id is null then s.last_request_end_time else getdate() end), 0) )* 1000
as session_ms_in_window
from sys.dm_exec_sessions s
left join sys.dm_exec_requests as r on s.session_id = r.session_id and s.session_id = 1
– Steve: Fixes end here
where (s.last_request_end_time > @WithActivitySince or r.request_id is not null)) as d
where (avg_request_cpu_per_ms * request_ms_in_window) + (avg_session_cpu_per_ms * session_ms_in_window) &gt; 1000.0</CommandText>
<QueryParameters>
<QueryParameter Name=”@WithActivitySince”>
<Value>=Parameters!WithActivitySince.Value</Value>
</QueryParameter>
</QueryParameters>
<DataSourceName>DataSource1</DataSourceName>
</Query>

  问题三：转换表达式的数据类型时出现算术溢出

    这个问题大多出现在点击蓝色CPU区域。打开 C:\Program Files\Microsoft SQL Server\90\Tools\PerformanceDashboard\recent_cpu.rdl.

  搜索WithActivitySince参数，并将它从String换成Datetime.