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宅地建物取引主任者見分ける作曲家負債総額金属製

Steven Ramacher

1/26/2014 10:57:00 AM

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http://www.nora-tschirner.net/v4/posting.php?mode=reply&t=1391/v4/posting.php?mode=reply?t=1391/viewtopic....
http://www.robotc.net/pltw/pforums/viewtopic.php?f=6&t=37888&p=62...
3 Answers

William Vaughn

2/22/2008 7:47:00 PM

0

A stored procedure uses a query plan that's created when the SP is first
executed and reuses that plan regardless of the suitability of the plan from
that point forward--until it's replaced. The plan is optimized based on the
indexes and the statistics that describe how the data is distributed in the
target indexes/tables (and many other factors). It's not a good idea to test
with VS for a number of reasons. Create an executable and run that to test
how well it performs.

hth

--
__________________________________________________________________________
William R. Vaughn
President and Founder Beta V Corporation
Author, Mentor, Dad, Grandpa
Microsoft MVP
(425) 556-9205 (Pacific time)
Hitchhiker's Guide to Visual Studio and SQL Server (7th Edition)
____________________________________________________________________________________________
"dustbort" <d_nospam_bortner@rockcreekglobal_nospam_.com> wrote in message
news:uTjHfcYdIHA.3940@TK2MSFTNGP05.phx.gbl...
> Gregory,
>
> Thanks for your ideas. I went to test them and it seems that the problem
> has miraculously vanished. I had just copied the production database to
> my workstation and updated the stored procedures for testing, prior to
> having the slow results. I wonder if the database does some
> initialization that had not completed at the time of the first tests?
> Something that would affect the .NET SqlClient but not SQL Mgmt Studio?
>
>
> "Cowboy (Gregory A. Beamer)" <NoSpamMgbworld@comcast.netNoSpamM> wrote in
> message news:u3dE0KYdIHA.2268@TK2MSFTNGP02.phx.gbl...
>> Make sure you are testing properly. Run the query twice from ADO.NET and
>> see if you have a different read time. There are two reasons I can think
>> of, without much thought, why you might get different read times from #1
>> to #2.
>>
>> 1. JIT time
>> 2. Stats being compiled on SQL Server
>>
>> If you find a difference, it may just be preloading your app before use
>> will solve your issue. If not, here are a variety of things you can look
>> at:
>>
>> 1. Library used to connect to SQL Server - If you can use In Memory, it
>> is fastest; none should be overall slow, so this is just shaving a bit of
>> time, not a full solution
>> 2. ADO.NET library used (ODBC, OLEDB or SQL)
>> 3. Check the indexes
>> a) Any fragmented indexes need to been recompiled
>> b) Do you have the right indexes for your query
>> 4. Would adding some locking hints, etc. help your query?
>> 5. Do you need hints for statistics?
>> 6. Can you improve the query? - Look at the execution plan, as it will
>> give you a lot of information on straightening out your world
>>
>> If you are dynamically adding statements in a sproc, you will find that
>> it will end up having to recompile each time and redo its stats. When you
>> compare this to the profiler command (meaning what is actually run in the
>> sproc versus running the sproc statement from profiler), you can see a
>> huge difference in time. This is why you need to make sure you are
>> running the sproc in each instance and not just the statement. Depending
>> on how you profile, you might only see the sproc call.
>>
>> --
>> Gregory A. Beamer
>> MVP, MCP: +I, SE, SD, DBA
>>
>> *************************************************
>> | Think outside the box! |
>> *************************************************
>> "dustbort" <d_nospam_bortner@rockcreekglobal_nospam_.com> wrote in
>> message news:%2321JRBYdIHA.4220@TK2MSFTNGP03.phx.gbl...
>>>I have a stored procedure that when called from SQL 2005 Management
>>>Studio
>>> takes less than one second to execute. The same SP, when called from
>>> .NET
>>> code takes about 13 seconds. I am using a SqlCommand object with
>>> CommandType set to StoredProcedure and I am passing arguments through
>>> the
>>> parameters collection. I have tried using a SqlDataReader and a
>>> DataAdapter
>>> to retrieve the data, but both are equally slow. From stepping thru the
>>> debugger, I know that the specific statement that takes a long time to
>>> execute is either reader.ExecuteReader() or dataAdapter.Fill(dataTable),
>>> equivalently depending on the method I tried. I did a trace in the
>>> Profiler, and got nearly identical result for either method of .NET
>>> SqlClient Data Provider. Here is an example:
>>>
>>> EventClass: RPC:Completed
>>> CPU: 13390
>>> Reads: 559475
>>> Writes: 0
>>> Duration: 13496
>>> Binary Data: (a long hex value)
>>>
>>> When I copied the TextData (SQL Statement being executed) from Profiler
>>> into
>>> SQL Management Studio, I get the following trace:
>>>
>>> EventClass: SQL:BatchCompleted
>>> CPU: 437
>>> Reads: 9998
>>> Writes: 0
>>> Duration: 440
>>> BinaryData: (empty)
>>>
>>> (Immediately prior to this there is a corresponding SQL:BatchStarting
>>> trace,
>>> with empty CPU, Reads, Writes, and Duration columns.)
>>>
>>> What could explain the orders of magnitude difference in reads and
>>> duration?
>>> Is the problem due to RPC? What about the binary data? I have tried
>>> using
>>> the overload of ExecuteReader(CommandBehavior.SingleResult) with no
>>> improvement. What can I try to improve it?
>>>
>>> Thanks,
>>> Dustin
>>>
>>>
>>>
>>
>>
>
>

Cowboy

2/22/2008 11:33:00 PM

0

Definitely.

When you first start using a new database it creates stats. Until created,
the first few queries run slowly, as will any unique type of query, as it
cannot hit stats.

--
Gregory A. Beamer
MVP, MCP: +I, SE, SD, DBA

*************************************************
| Think outside the box!
|
*************************************************
"dustbort" <d_nospam_bortner@rockcreekglobal_nospam_.com> wrote in message
news:uTjHfcYdIHA.3940@TK2MSFTNGP05.phx.gbl...
> Gregory,
>
> Thanks for your ideas. I went to test them and it seems that the problem
> has miraculously vanished. I had just copied the production database to
> my workstation and updated the stored procedures for testing, prior to
> having the slow results. I wonder if the database does some
> initialization that had not completed at the time of the first tests?
> Something that would affect the .NET SqlClient but not SQL Mgmt Studio?
>
>
> "Cowboy (Gregory A. Beamer)" <NoSpamMgbworld@comcast.netNoSpamM> wrote in
> message news:u3dE0KYdIHA.2268@TK2MSFTNGP02.phx.gbl...
>> Make sure you are testing properly. Run the query twice from ADO.NET and
>> see if you have a different read time. There are two reasons I can think
>> of, without much thought, why you might get different read times from #1
>> to #2.
>>
>> 1. JIT time
>> 2. Stats being compiled on SQL Server
>>
>> If you find a difference, it may just be preloading your app before use
>> will solve your issue. If not, here are a variety of things you can look
>> at:
>>
>> 1. Library used to connect to SQL Server - If you can use In Memory, it
>> is fastest; none should be overall slow, so this is just shaving a bit of
>> time, not a full solution
>> 2. ADO.NET library used (ODBC, OLEDB or SQL)
>> 3. Check the indexes
>> a) Any fragmented indexes need to been recompiled
>> b) Do you have the right indexes for your query
>> 4. Would adding some locking hints, etc. help your query?
>> 5. Do you need hints for statistics?
>> 6. Can you improve the query? - Look at the execution plan, as it will
>> give you a lot of information on straightening out your world
>>
>> If you are dynamically adding statements in a sproc, you will find that
>> it will end up having to recompile each time and redo its stats. When you
>> compare this to the profiler command (meaning what is actually run in the
>> sproc versus running the sproc statement from profiler), you can see a
>> huge difference in time. This is why you need to make sure you are
>> running the sproc in each instance and not just the statement. Depending
>> on how you profile, you might only see the sproc call.
>>
>> --
>> Gregory A. Beamer
>> MVP, MCP: +I, SE, SD, DBA
>>
>> *************************************************
>> | Think outside the box! |
>> *************************************************
>> "dustbort" <d_nospam_bortner@rockcreekglobal_nospam_.com> wrote in
>> message news:%2321JRBYdIHA.4220@TK2MSFTNGP03.phx.gbl...
>>>I have a stored procedure that when called from SQL 2005 Management
>>>Studio
>>> takes less than one second to execute. The same SP, when called from
>>> .NET
>>> code takes about 13 seconds. I am using a SqlCommand object with
>>> CommandType set to StoredProcedure and I am passing arguments through
>>> the
>>> parameters collection. I have tried using a SqlDataReader and a
>>> DataAdapter
>>> to retrieve the data, but both are equally slow. From stepping thru the
>>> debugger, I know that the specific statement that takes a long time to
>>> execute is either reader.ExecuteReader() or dataAdapter.Fill(dataTable),
>>> equivalently depending on the method I tried. I did a trace in the
>>> Profiler, and got nearly identical result for either method of .NET
>>> SqlClient Data Provider. Here is an example:
>>>
>>> EventClass: RPC:Completed
>>> CPU: 13390
>>> Reads: 559475
>>> Writes: 0
>>> Duration: 13496
>>> Binary Data: (a long hex value)
>>>
>>> When I copied the TextData (SQL Statement being executed) from Profiler
>>> into
>>> SQL Management Studio, I get the following trace:
>>>
>>> EventClass: SQL:BatchCompleted
>>> CPU: 437
>>> Reads: 9998
>>> Writes: 0
>>> Duration: 440
>>> BinaryData: (empty)
>>>
>>> (Immediately prior to this there is a corresponding SQL:BatchStarting
>>> trace,
>>> with empty CPU, Reads, Writes, and Duration columns.)
>>>
>>> What could explain the orders of magnitude difference in reads and
>>> duration?
>>> Is the problem due to RPC? What about the binary data? I have tried
>>> using
>>> the overload of ExecuteReader(CommandBehavior.SingleResult) with no
>>> improvement. What can I try to improve it?
>>>
>>> Thanks,
>>> Dustin
>>>
>>>
>>>
>>
>>
>
>


google

3/11/2008 2:18:00 PM

0

On Feb 22, 6:32 pm, "Cowboy \(Gregory A. Beamer\)"
<NoSpamMgbwo...@comcast.netNoSpamM> wrote:
> Definitely.
>
> When you first start using a new database it creates stats. Until created,
> the first few queries run slowly, as will any unique type of query, as it
> cannot hit stats.
>
> --
> Gregory A. Beamer
> MVP, MCP: +I, SE, SD, DBA
>
> *************************************************
> | Think outside the box!
> |
> *************************************************"dustbort" <d_nospam_bortner@rockcreekglobal_nospam_.com> wrote in message
>
> news:uTjHfcYdIHA.3940@TK2MSFTNGP05.phx.gbl...
>
>
>
> > Gregory,
>
> > Thanks for your ideas.  I went to test them and it seems that the problem
> > has miraculously vanished.  I had just copied the production database to
> > my workstation and updated the stored procedures for testing, prior to
> > having the slow results.  I wonder if the database does some
> > initialization that had not completed at the time of the first tests?
> > Something that would affect the .NET SqlClient but not SQL Mgmt Studio?
>
> > "Cowboy (Gregory A. Beamer)" <NoSpamMgbwo...@comcast.netNoSpamM> wrote in
> > messagenews:u3dE0KYdIHA.2268@TK2MSFTNGP02.phx.gbl...
> >> Make sure you are testing properly. Run the query twice from ADO.NET and
> >> see if you have a different read time. There are two reasons I can think
> >> of, without much thought, why you might get different read times from #1
> >> to #2.
>
> >> 1. JIT time
> >> 2. Stats being compiled on SQL Server
>
> >> If you find a difference, it may just be preloading your app before use
> >> will solve your issue. If not, here are a variety of things you can look
> >> at:
>
> >> 1. Library used to connect to SQL Server - If you can use In Memory, it
> >> is fastest; none should be overall slow, so this is just shaving a bit of
> >> time, not a full solution
> >> 2. ADO.NET library used (ODBC, OLEDB or SQL)
> >> 3. Check the indexes
> >>    a) Any fragmented indexes need to been recompiled
> >>    b) Do you have the right indexes for your query
> >> 4. Would adding some locking hints, etc. help your query?
> >> 5. Do you need hints for statistics?
> >> 6. Can you improve the query? - Look at the execution plan, as it will
> >> give you a lot of information on straightening out your world
>
> >> If you are dynamically adding statements in a sproc, you will find that
> >> it will end up having to recompile each time and redo its stats. When you
> >> compare this to the profiler command (meaning what is actually run in the
> >> sproc versus running the sproc statement from profiler), you can see a
> >> huge difference in time. This is why you need to make sure you are
> >> running the sproc in each instance and not just the statement. Depending
> >> on how you profile, you might only see the sproc call.
>
> >> --
> >> Gregory A. Beamer
> >> MVP, MCP: +I, SE, SD, DBA
>
> >> *************************************************
> >> | Think outside the box! |
> >> *************************************************
> >> "dustbort" <d_nospam_bortner@rockcreekglobal_nospam_.com> wrote in
> >> messagenews:%2321JRBYdIHA.4220@TK2MSFTNGP03.phx.gbl...
> >>>I have a stored procedure that when called from SQL 2005 Management
> >>>Studio
> >>> takes less than one second to execute.  The same SP, when called from
> >>> .NET
> >>> code takes about 13 seconds.  I am using a SqlCommand object with
> >>> CommandType set to StoredProcedure and I am passing arguments through
> >>> the
> >>> parameters collection.  I have tried using a SqlDataReader and a
> >>> DataAdapter
> >>> to retrieve the data, but both are equally slow.  From stepping thru the
> >>> debugger, I know that the specific statement that takes a long time to
> >>> execute is either reader.ExecuteReader() or dataAdapter.Fill(dataTable),
> >>> equivalently depending on the method I tried.  I did a trace in the
> >>> Profiler, and got nearly identical result for either method of .NET
> >>> SqlClient Data Provider. Here is an example:
>
> >>> EventClass: RPC:Completed
> >>> CPU: 13390
> >>> Reads: 559475
> >>> Writes: 0
> >>> Duration: 13496
> >>> Binary Data: (a long hex value)
>
> >>> When I copied the TextData (SQL Statement being executed) from Profiler
> >>> into
> >>> SQL Management Studio, I get the following trace:
>
> >>> EventClass: SQL:BatchCompleted
> >>> CPU: 437
> >>> Reads: 9998
> >>> Writes: 0
> >>> Duration: 440
> >>> BinaryData: (empty)
>
> >>> (Immediately prior to this there is a corresponding SQL:BatchStarting
> >>> trace,
> >>> with empty CPU, Reads, Writes, and Duration columns.)
>
> >>> What could explain the orders of magnitude difference in reads and
> >>> duration?
> >>> Is the problem due to RPC?  What about the binary data?  I have tried
> >>> using
> >>> the overload of ExecuteReader(CommandBehavior.SingleResult) with no
> >>> improvement.  What can I try to improve it?
>
> >>> Thanks,
> >>> Dustin- Hide quoted text -
>
> - Show quoted text -

I had an similar issue. I think it's due to the fragmentation of the
tables. Look at the indexes on the tables.