Performance Trace-off
Jun 4, 1999
Hi All,
I've just joined a project for improving performance issue on MS-SqlServer(6.5).
I was DBA Sybase a couple years ago I am unsure that MSSQL works in a manner as
Sybase. I want to change some configuration options (sp_compile) and modify
the table and indexes definition for improving the performance and avoid having
deadlocks.
Is true that :
When field, which has a default value assigned to NULL, is equal
at a variable-length field and when you execute an update on it you will
get 2 transactions : first a delete and then insert ?
(On Sybase there is the concept of Index Covering to avoid that overhead
what about Ms-Sqlserver 6.5).
To avoid having deadlock I want to use the FILLFACTOR I think this option
is usefull only on cluster indexes, that's right ?
For huge tables the order of fields is important :
first position put the primary key field
after put the FK, secondary key, short type field (tinyint,int,datetime...)
go on with the alpha fields (char) NOT NULL
at last the NULL fields
Is that design efficient for Ms-SQLserver ?
Many thanks,
Herve
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May 17, 2007
hi all..
i have 2 tbl..
-- Prepare sample data
DECLARE@tbl1 TABLE (box varchar(10), loc varchar(5) )
INSERT@tbl1
SELECT'P1', 'aa' UNION ALL
SELECT'P1', 'bb' UNION ALL
SELECT'P1', 'aa' UNION ALL
SELECT'P3', 'cc'
DECLARE@tbl2 TABLE (box varchar(10), loc varchar(5) )
INSERT@tbl2
SELECT'P1', 'aa' UNION ALL
SELECT'P3', 'cc'
--expected result
SELECT 'P1' as box, 'aa' as Location, 'aa' as HeaderLoc UNION ALL
SELECT 'P1' as box, 'bb' as Location, 'aa' as HeaderLoc
how do i trace from @tbl1, that has 1 Box with more than 1 Location?
in this case P1 has 2 distinct location (aa & bb).. and left join in the loc from @tbl2 just to retrieve the loc for that box..
~~~Focus on problem, not solution ¯(º_o)/¯ ~~~
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Jun 17, 2008
I have written a script to run profiler trace as far as I can. Guide me if i can add some more so i don't cause performance hog and which can be scheduled as well.
Here is the script:
--Stored Procedure to run trace for 30 minutes
Create Procedure dbo.Usp_Tracefor30minutes
as
set nocount on
declare @stop datetime
set @stop = dateadd(mi,30,getdate())
declare @rc int
declare @TraceID int
declare @maxfilesize bigint
set @maxfilesize = 50
-- create traces and saves in folder specified
exec @rc = sp_trace_create @TraceID output, 0, N'InsertFileNameHere', @maxfilesize, @stop
if (@rc != 0) goto error
-- Set the events
declare @on bit
set @on = 1
exec sp_trace_setevent @TraceID, 17, 12, @on
exec sp_trace_setevent @TraceID, 17, 1, @on
exec sp_trace_setevent @TraceID, 17, 9, @on
exec sp_trace_setevent @TraceID, 17, 6, @on
-- 17 - Existing Connections
exec sp_trace_setevent @TraceID, 17, 10, @on
exec sp_trace_setevent @TraceID, 17, 14, @on
exec sp_trace_setevent @TraceID, 17, 11, @on
exec sp_trace_setevent @TraceID, 10, 15, @on
exec sp_trace_setevent @TraceID, 10, 16, @on
exec sp_trace_setevent @TraceID, 10, 1, @on
-- 10 - RPC:Completed
exec sp_trace_setevent @TraceID, 10, 17, @on
exec sp_trace_setevent @TraceID, 10, 2, @on
exec sp_trace_setevent @TraceID, 10, 10, @on
exec sp_trace_setevent @TraceID, 10, 18, @on
exec sp_trace_setevent @TraceID, 10, 11, @on
exec sp_trace_setevent @TraceID, 10, 12, @on
exec sp_trace_setevent @TraceID, 10, 13, @on
exec sp_trace_setevent @TraceID, 10, 6, @on
exec sp_trace_setevent @TraceID, 10, 14, @on
exec sp_trace_setevent @TraceID, 43, 15, @on
exec sp_trace_setevent @TraceID, 43, 1, @on
exec sp_trace_setevent @TraceID, 43, 9, @on
-- 43 - SP:Completed
exec sp_trace_setevent @TraceID, 43, 10, @on
exec sp_trace_setevent @TraceID, 43, 11, @on
exec sp_trace_setevent @TraceID, 43, 12, @on
exec sp_trace_setevent @TraceID, 43, 13, @on
exec sp_trace_setevent @TraceID, 43, 6, @on
exec sp_trace_setevent @TraceID, 43, 14, @on
exec sp_trace_setevent @TraceID, 37, 1, @on
exec sp_trace_setevent @TraceID, 37, 9, @on
exec sp_trace_setevent @TraceID, 37, 6, @on
-- 37 - SP:Recompile
exec sp_trace_setevent @TraceID, 37, 10, @on
exec sp_trace_setevent @TraceID, 37, 14, @on
exec sp_trace_setevent @TraceID, 37, 11, @on
exec sp_trace_setevent @TraceID, 37, 12, @on
exec sp_trace_setevent @TraceID, 12, 15, @on
exec sp_trace_setevent @TraceID, 12, 16, @on
exec sp_trace_setevent @TraceID, 12, 1, @on
-- 12 - SQL:BatchCompleted
exec sp_trace_setevent @TraceID, 12, 9, @on
exec sp_trace_setevent @TraceID, 12, 17, @on
exec sp_trace_setevent @TraceID, 12, 6, @on
exec sp_trace_setevent @TraceID, 12, 10, @on
exec sp_trace_setevent @TraceID, 12, 14, @on
exec sp_trace_setevent @TraceID, 12, 18, @on
exec sp_trace_setevent @TraceID, 12, 11, @on
exec sp_trace_setevent @TraceID, 12, 12, @on
exec sp_trace_setevent @TraceID, 12, 13, @on
exec sp_trace_setevent @TraceID, 13, 12, @on
exec sp_trace_setevent @TraceID, 13, 1, @on
exec sp_trace_setevent @TraceID, 13, 9, @on
-- 13 SQL :BatchStarting
exec sp_trace_setevent @TraceID, 13, 6, @on
exec sp_trace_setevent @TraceID, 13, 10, @on
exec sp_trace_setevent @TraceID, 13, 14, @on
exec sp_trace_setevent @TraceID, 13, 11, @on
-- Set the Filters
declare @intfilter int
declare @bigintfilter bigint
exec sp_trace_setfilter @TraceID, 10, 0, 7, N'SQL Server Profiler'
set @bigintfilter = 5000
exec sp_trace_setfilter @TraceID, 13, 0, 4, @bigintfilter
-- Set the trace status to start
exec sp_trace_setstatus @TraceID, 1
-- display trace id for future references
select TraceID=@TraceID
goto finish
error:
select ErrorCode=@rc
finish:
go
--Exec SP
Exec dbo.Usp_Tracefor30minutes
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