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Need to tweak sql query

Posted on 2011-02-16
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Last Modified: 2012-05-11
Hi,

I have a query which populates a table called pcms_sql_cache - the definition is below for the table;
The table gets populated by the query i have below;
What i need to do is run the sql hourly to populate the table from a sql job then raise an alert if the
column avg_recent_duration is greater than 5sec;
How should the sql be changed to run and check the column avg_recent_duration;
Please help - the sql looks worse than it is !

thanks

CREATE TABLE [dbo].[pcms_sql_cache](
      [ID] [int] IDENTITY(1,1) NOT NULL,
      [Timestamp] [datetime] NULL,
      [database_name] [varchar](20) NOT NULL,
      [statement_text] [varchar](5000) NOT NULL,
      [cache_creation_time] [datetime] NOT NULL,
      [total_execution_count] [bigint] NOT NULL,
      [total_cpu_time] [bigint] NOT NULL,
      [total_elapsed_time] [bigint] NOT NULL,
      [total_recent_time] [bigint] NULL,
      [total_recent_executions] [bigint] NULL,
      [avg_recent_duration] [bigint] NULL
) ON [PRIMARY]

INSERT INTO pcms_sql_cache
SELECT TOP 1
   GETDATE() as timestamp
   ,   DB_Name(qp.dbid) as database_name
   , SUBSTRING(qt.text, (qs.statement_start_offset/2) + 1,
        ((CASE statement_end_offset
            WHEN -1 THEN DATALENGTH(qt.text)
            ELSE qs.statement_end_offset END
                - qs.statement_start_offset)/2) + 1) as statement_text    
                , qs.creation_time as cache_creation_time
                , qs.execution_count
    , qs.total_worker_time as total_cpu_time
    , qs.total_elapsed_time
    , CASE WHEN (qs.total_elapsed_time - (select total_elapsed_time from pcms_sql_cache where ID=(select max(ID)from pcms_sql_cache))) >=0
      THEN  (qs.total_elapsed_time - (select total_elapsed_time from pcms_sql_cache where ID=(select max(ID)from pcms_sql_cache))) ELSE NULL END as total_recent_time
    , (qs.execution_count - (select total_execution_count from pcms_sql_cache where ID=(select max(ID) from pcms_sql_cache))) as

total_recent_executions
   , (qs.total_elapsed_time - (select total_elapsed_time from pcms_sql_cache where ID=(select max(ID)from pcms_sql_cache)))/    
   NULLIF((qs.execution_count - (select total_execution_count from pcms_sql_cache where ID=(select max(ID)from pcms_sql_cache))),0) as

avg_recent_duration
    FROM sys.dm_exec_query_stats as qs
    CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) as qp
    CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qt
     Where DB_Name(qp.dbid) = 'Autopart'
     and (SUBSTRING(qt.text, (qs.statement_start_offset/2) + 1,
        ((CASE statement_end_offset
            WHEN -1 THEN DATALENGTH(qt.text)
            ELSE qs.statement_end_offset END
                -qs.statement_start_offset)/2) + 1)) LIKE 'Select top 100%';
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Question by:hraja77
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3 Comments
 
LVL 7

Accepted Solution

by:
tlovie earned 500 total points
ID: 34908419
you could create a stored procedure that would do something like this and run it in a job:

create procedure spPCMS_SQL_CACHE as

declare @timestamp datetime
select @timestamp=getdate()

INSERT INTO pcms_sql_cache
SELECT TOP 1
   @timestamp
   ,   DB_Name(qp.dbid) as database_name
   , SUBSTRING(qt.text, (qs.statement_start_offset/2) + 1,
        ((CASE statement_end_offset
            WHEN -1 THEN DATALENGTH(qt.text)
            ELSE qs.statement_end_offset END
                - qs.statement_start_offset)/2) + 1) as statement_text    
                , qs.creation_time as cache_creation_time
                , qs.execution_count
    , qs.total_worker_time as total_cpu_time
    , qs.total_elapsed_time
    , CASE WHEN (qs.total_elapsed_time - (select total_elapsed_time from pcms_sql_cache where ID=(select max(ID)from pcms_sql_cache))) >=0
      THEN  (qs.total_elapsed_time - (select total_elapsed_time from pcms_sql_cache where ID=(select max(ID)from pcms_sql_cache))) ELSE NULL END as total_recent_time
    , (qs.execution_count - (select total_execution_count from pcms_sql_cache where ID=(select max(ID) from pcms_sql_cache))) as

total_recent_executions
   , (qs.total_elapsed_time - (select total_elapsed_time from pcms_sql_cache where ID=(select max(ID)from pcms_sql_cache)))/    
   NULLIF((qs.execution_count - (select total_execution_count from pcms_sql_cache where ID=(select max(ID)from pcms_sql_cache))),0) as

avg_recent_duration
    FROM sys.dm_exec_query_stats as qs
    CROSS APPLY sys.dm_exec_query_plan(qs.plan_handle) as qp
    CROSS APPLY sys.dm_exec_sql_text(qs.sql_handle) as qt
     Where DB_Name(qp.dbid) = 'Autopart'
     and (SUBSTRING(qt.text, (qs.statement_start_offset/2) + 1,
        ((CASE statement_end_offset
            WHEN -1 THEN DATALENGTH(qt.text)
            ELSE qs.statement_end_offset END
                -qs.statement_start_offset)/2) + 1)) LIKE 'Select top 100%';


if exists (select * from pcms_sql_cache where timestamp=@timestamp and avg_recent_duration>5)
     exec MSDB.dbo.sp_send_dbmail @recipients='you@youremail.com;somebodyelse@youremail.com', @subject='Longer run times experienced', @body='whatever you want here'
0
 
LVL 1

Author Comment

by:hraja77
ID: 34908553
so far so good - but just aquick one - if the 'IF' statement is true i want to just make the sql server job fail - how would i do this ?

thanks
H
0
 
LVL 7

Expert Comment

by:tlovie
ID: 34908620
you'd have to change the if block to this:  


if exists (select * from pcms_sql_cache where timestamp=@timestamp and avg_recent_duration>5)
     begin
     exec MSDB.dbo.sp_send_dbmail @recipients='you@youremail.com;somebodyelse@youremail.com', @subject='Longer run times experienced', @body='whatever you want here'
     raiserror('Raiserror statement', 16, 1);
     end
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