LIKE Is Considered Awful From Performance Point Of View?

Oct 4, 2006

Hi all,
first of all I shoud mention it that I have posted a similar question in Oracle forum and recieve enough oracle-related feedback and solution, here (http://www.dbforums.com/showthread.php?t=1609238).

Now I want to know if LIKE searches are awful (performance wise) in SQL Server too, do you recommand any solution to enhance it by some indexing twick? I want to avoid using MS index service (if I spell it correctly) as far as I could ;)

Note: We have a lot of LIKE '%abc%' queries at this system.

-Thanks in advance for your time and help :)

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Which Is Better Option From Performance Point Of View?

Jun 29, 2007

hi all,

if i want to join two tables and populate data into an oldb destination which option will be better

from performance point of view?

1. using look up transformation

2.writing join query in oldb source using sql commmand option.

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The Awful SELECT COUNT(*)

Apr 25, 2008

I found some really helpful code that allows for quick retrieval of select count(*). But am I right in saying that select count(*) can cause locks on the table?


This is the code
dbcc updateusage (N'Test')
go
select count(1) from Testdb
go
CREATE FUNCTION dbo.udf_Tbl_RowCOUNT (

@sTableName sysname -- Table to retrieve Row Count
)

RETURNS INT -- Row count of the table, NULL if not found.

/*
* Returns the row count for a table by examining sysindexes.
* This function must be run in the same database as the table.
*
* Common Usage:
SELECT dbo.udf_Tbl_RowCOUNT ('')

* Test
PRINT 'Test 1 Bad table ' + CASE WHEN SELECT
dbo.udf_Tbl_RowCOUNT ('foobar') is NULL
THEN 'Worked' ELSE 'Error' END

* © Copyright 2002 Andrew Novick http://www.NovickSoftware.com
* You may use this function in any of your SQL Server databases
* including databases that you sell, so long as they contain
* other unrelated database objects. You may not publish this
* UDF either in print or electronically.
***************************************************************/

AS BEGIN

DECLARE @nRowCount INT -- the rows
DECLARE @nObjectID int -- Object ID

SET @nObjectID = OBJECT_ID(@sTableName)

-- Object might not be found
IF @nObjectID is null RETURN NULL

SELECT TOP 1 @nRowCount = rows
FROM sysindexes
WHERE id = @nObjectID AND indid < 2

RETURN @nRowCount
END
GO

GRANT EXECUTE ON [dbo].[udf_Tbl_RowCOUNT] TO PUBLIC
GO



use Test -- assuming the UDF was created in Test
go

SELECT [name]
, dbo.udf_Tbl_RowCOUNT ([name]) as [Row Count]
FROM sysobjects
WHERE type='U' and name != 'dtproperties'
ORDER BY [name]
GO

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Question About Connection Pool From The Servers Point Of View

Nov 2, 2007

I was wondering if someone could help explaining how the SQL Server handles all incoming connections, I and a friend started a discussion about using the connection pool in ADO.NET or not in a specific case.


Usually when creating like an ASP.NET Page it's recommended to use the connection pool, because it optimizes the performance, by using already created connection, so we don't have to recreate the connection all the time. I have always thought that the connection in the connection pool had an open connection on the server. So 5 connections in the connection pool, would be 5 open connections at the server. But after having the discussion with my friend I am not so sure anymore.


Say that I would create a client application (.NET using ADO.NET) that connects to the database and work with that data. If I then have 1.000 clients and each client have a connection pool with 5 connections in it (I think that the default numbers for the connection pool), then there would be like 5.000 open connections on the SQL Server, where most of the connections actually never do anything more than hanging around and waiting... And then the connectionpool is not 1 per client but 1 per connectionstring.


So if my client scenario would access data from 2 different databases, there would actually be 10.000 open connections at the SQL Server. So now I think that there must be a server connection pool or something to handle the connection from the clients. So that there would only be like 10-50 open connections at the server for the 1.000 Clients that was connected.


How is it? Is there 1 open connection in the server for every connection in the connection pool? If that's the case, it would be better for the SQL Server if I don't not use the connection pool in the client, but instead open the connection when we need it, and then close it, and taking that little performance hit every time, to help the performance on the SQL Server.


Best regards

- Magnus

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We have created a chart in SharePoint 2013 with performance point dashboard designer. We want to change Title of chart. For more  information please check attached image.

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Mar 20, 2008

Which sort of data (from application architecture) point of view it's worth to put in XML datatype (MS SQL 2005)?

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May 22, 2006

have a 3rd party sql 2000 app, mostly bad sql. have lock issues, when monitoring sql locks/req per second, I get normally between 500,000 and 1,000,000 requests. For a 4 way box with 16 gig of memory, what is considered an excessive amounts of locks.

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Value +00000000000000 Considered As NULL Values In The Last Column

Apr 4, 2006



Hello

I use a Flat File Connection Manager for a file with 18 columns.

My column delimiter is the "~" caracter and my row delimiter is "{CR}{LF}"

The source files contains about 2300 lines. None of them contain NULL values.

My last row is a numeric(16,2). Even if it is not the appropriate type for the value I want extract, it works with all my columns.

My problem is with the last column. I have read the SQL Server 2005 interpretation of the row delimiter as actually the last row column delimiter.

But, here, my values are OK and put in the destination table if it is not 0 : "+0000000001352" for example in the file.

If it is 0 : "+00000000000000", and if I considered errors as INGORE FAILURE and put data in the destination table, accepting NULL values, I have NULL values in table for these 0 values. And correct values for non-0 values.

How do you explain that ? How I can fix the problem and correctly read my file ?



For your information, if I REDIRECT ROW in the Flat File Error Output, the ErrorCode is : -1071607676 and ErrorDescription is "The data value cannot be converted for reasons other than sign mismatch or data overflow."

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Value 0000 Considered As NULL Values In The Last Column

Mar 21, 2006

Hello

I use a Flat File Connection Manager for a file with 18 columns.

My column delimiter is the "~" caracter and my row delimiter is "{CR}{LF}"

The source files contains about 2300 lines. None of them contain NULL values.

My last row is a numeric(16,2). Even if it is not the appropriate type for the value I want extract, it works with all my columns.

My problem is with the last column. I have read the SQL Server 2005 interpretation of the row delimiter as actually the last row column delimiter.

But, here, my values are OK and put in the destination table if it is not 0 : "+0000000001352" for example in the file.

If it is 0 : "+00000000000000", and if I considered errors as INGORE FAILURE and put data in the destination table, accepting NULL values, I have NULL values in table for these 0 values. And correct values for non-0 values.

How do you explain that ? How I can fix the problem and correctly read my file ?



For your information, if I REDIRECT ROW in the Flat File Error Output, the ErrorCode is : -1071607676 and ErrorDescription is "The data value cannot be converted for reasons other than sign mismatch or data overflow."

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Aug 6, 2012

I am facing sever Refresh issue in PPS Reports. I have Two Dashboard

Dashboard_One and Dashboard_Two

I have few Filters on both the Dashboard .

In Dashboard_One  I have 2 Filters

1)Year filter where Year 2012 is my Default value
2)City Filter where "CityOne" is Default Filter Value

If I  select Year"2010" in Period Filter and "CityTwo" In City Filter.I see Related reports . Now I navigate to Dashboard_Two to See Other Reports where I have few Other Filter Like  "Country" where I select "CountryThree" . When I navigate Back to Dashboard_one I do not see Dashboard with Default value given to them

I still see Filter value Year=2010 and CountryFilter="CountryTwo" in Dashboard Dashboard_One .. where as I should have  seen it based on the Default  value given to the Filter.. How should I resolve this refresh issue which I am facing in PPS Dashboard. I do not see Default value in the Filter ,It always give the filter value which was selected later when Navigated back.

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Mar 26, 2008

Hello all,

First off, I appreciate the time that those of you reading and responding to this request are offering. My quesiton is a theoretical and hopefully simple one, and yet I have been unable to find an answer to it on other searches or sources.

Here's the situation. I am working with SQL Server 2005 on a Windows Server 2003 machine. I have a series of databases, all of which are in Full recovery mode, using a backup device for the full database backups and a separate device for the log backups. The full backups are run every four days during non-business hours. The log backups are run every half hour.

Last week, one of my coworkers found that some rarely-used data was unavailable, and wanted to restore a database to a point in time where the data was available. He told me that point in time was some time back in November.

To accomplish this, I restored the database (in a separate database, as to not overwrite my production database) using the Point in Time Recovery option. I selected November from the "To a point in time" window (I should note that this window is always grey, never white like most active windows, it seems), and the full database backup and the subsequent logs all became available in the "Select the backup sets to restore" window.

I then tried a bevy of different options from the "Options" screen. However, every restore succeeds (ie: it doesn't error out), but seems to be bringing the database back to a current point in time. It's never actually going back to the point in time I specify.

My questions are as follows:

a) Is it possible to do a point in time recovery to a point in time BEFORE the last full database backup?

b) If so, what options would you recommend I use? (ie: "Overwrite the existing database", restore with recovery, etc etc).

I again appreciate any and all advice I receive, and I look forward to hearing from anyone and everyone on this topic. Thank you.

Ryan

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View Performance

Jan 27, 2002

Hi,

I have a select statement (that joins 5 tables) and performs fine (when I execute with an
additional 'and' statement that uses the 'like' keyword.)

select f1, f2, f3...f10
from table1, table2, .. ,table5
where table1.f3= table4.f4
and ...
...
...
and table2.f7 = table1.f4
and table4.f4 like 'MYNAME%'


When I create a view with all of the statement except the last:

create view myview as
select f1, f2, f3...f10
from table1, table2, .. ,table5
where table1.f3= table4.f4
and ...
...
...
and table2.f7 = table1.f4

and then when I say

select * from myview where f4 like 'MYNAME%'

the performance tanks.
The query plan completely changes and the resoponse time slows down 100+ times.

I know views are bad, but I am using PeopleSoft and I need to make this view work.
Any ideas how?

Thanks in advance,

Mike Matthews.

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Performance On View

Apr 9, 2008

Hey there,

I have a view on 5 tables.
The first [tblOrder] 62000 records
The second joined on the first [tblOrderRegel] 2140000 records
The third joined on the second [tblAssortimentSamenstelling] 5800 records
The fourth [tblArtikelVerpakking] 1650 records
And the last also joined on the third [tblAssortiment] 30 records

When I use the next query
SELECT *
FROM [dbBIBSMonitor].[dbo].[vwOrderRegel_1]
WHERE IDOrder in(SELECT IDOrder FROM [vwOrder] WHERE IDRelatie = 6)
GO

It will take more than 60 seconds before the resuld is there

The sub select 'SELECT IDOrder FROM [vwOrder] WHERE IDRelatie = 6' returns a list of ID's. When I make the same select with this ID's instead of the sub select the result returns in 1 second

SELECT *
FROM [dbBIBSMonitor].[dbo].[vwOrderRegel_1]
WHERE IDOrder IN( 4296, 4374, 4433, 9261, 9714, 9732, 9876, 10182, 10223, 17677, 18117, 18393, 28116, 28125, 28246, 31263, 32384, 33482, 33605, 33721, 33792, 36838, 38000, 40579, 40920, 50205, 52292, 52884)
GO

In the first select I have on all tables en index SCAN on the primairy Index with Hash Match/Inner Join to match.

In the second select I have on all tables en index SEEK on the primairy Index with Nested loop/Inner Join to match.

For the sub select 'SELECT IDOrder FROM [vwOrder] WHERE IDRelatie = 6' is not the primairy key used but an other Unique index Containing three columns.
[IDOrder] (also the primairy Key),
[IDStatus] (1, 2 or 3. 90% = 3),
and a date field.

In the view on the subselect is an UNION of three selects.
SELECT IDOrder, Date_1
From tblOrder
WHERE IDStatus = 1
UNION
SELECT IDOrder, Date_2
From tblOrder
WHERE IDStatus = 2
UNION
SELECT IDOrder, Date_2
From tblOrder
WHERE IDStatus = 3

Thats the reason he usses the Unique Index

Is using this index the reason that he does not SEEK on the first table (also tblOrder) of the view in my select???
In other words: Does SQL-server can use only 1 index on a table for a SEEK?

I hope somebody can give me an answer on this complex story.

Thanks Jaap

By the way. I have already tried selects with a INNNER JOIN in stead of a sub query and also a corralated sub query.

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SQL View Performance

Nov 24, 2005

Hi all,SQL Server 2000 service pack 3 running on Quad zeon windows 2003 serverwith 6GB of ram.A few months ago we split our databases into operational and completeddata...So now instead of doing select * from tblTest, we do select * fromtblTestboth where tblTestboth is a view like this:Select *From Operational.dbo.tbltestUNIONSelect *From Archive.dbo.tbltestThe tables on both databases are heavily indexed but it still takes muchlonger to do the select * from tblTestBoth than it is to doSelect *From Operational.dbo.tbltestUNIONSelect *From Archive.dbo.tbltestCan anyone please tell me why that is? We are starting to get timeoutsregularly...Should I use indexed views even though the data is inserted/updatedmultiple hundres of times per second?Thank you very much in advance for your help...Regards,Auday*** Sent via Developersdex http://www.developersdex.com ***

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Apr 1, 2001

Hi,
I created a view on two huge tables. I tried to run a simple SELECT statement on this view and it took me several hours to obtain the result. How can I improve the performance of a view? The view should make use of the indexes built in both table, am I right? Thanks.

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Jan 31, 2000

Hello,

I have the same database on two different servers. One for production and one for testing. A view that I use runs in less than 2 seconds on the test system, but takes almost 2 minutes on the production server.

What I have noticed is on the test server the view will use an index. The production server ends up scanning a whole table. All indices are the same on both machines for the tables involved and I have updated the statistics. I even went through the process of creating a new table with its indices for the table that is being scanned. Both machines have had service pack 1 installed on them.

Any ideas?

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Jan 31, 2008

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I am fairly new to SQL Server 2005, so I am not sure what to check. I am opening the view in Access using an ADP and also in Management Studio.

Also, there are only a couple of users and at the time we are experiencing problems, there really isn't anything going on. No one is trying to run a large query or anything like that.

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Nov 1, 2000

I have a complex(long) SQL statement inside of a stored procedure which feeds several variables from 2 tables. Something like

Select @var1, @var2, etc from
table1, table2 where
table1.id = table2.id

Is there any advantage to creating a view for this statement
and selecting from that, even though this resides in a stored procedure?

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INDEXED VIEW Performance Problem...

Mar 17, 2004

I have an Indexed View with followed syntax:

CREATE VIEW VW_Emplacamentos
WITH SCHEMABINDING
AS
SELECTA.CD_Linha -- This is the unique clustered field
A.DT_Emplacamento,
A.NR_CNPJ,
A.CD_Municipio,
A.VL_Potencia,
A.VL_CapacidadeCarga,
A.NR_QtdPax,
A.NR_AnoFabricacao,
A.NR_Chassi,
A.SG_UF,
A.CD_MarcaModelo,
A.CD_Procedencia,
A.CD_Combustivel,
B.NM_Municipio,
C.NM_Combustivel,
D.NM_MarcaModelo,
D.CD_Segmento,
D.CD_Fabricante,
E.NM_Segmento,
F.NM_SubSegmento,
G.NM_Fabricante

FROM dbo.TB_Emplacamentos AS A
INNER JOIN dbo.TB_Municipio AS B ON A.CD_Municipio = B.CD_Municipio
INNER JOIN dbo.TB_Combustivel AS C ON A.CD_Combustivel = C.CD_Combustivel
INNER JOIN dbo.TB_ModeloVeiculo AS D ON A.CD_MarcaModelo = D.CD_MarcaModelo
INNER JOIN dbo.TB_SegmentoVeiculo AS E ON D.CD_Segmento= E.CD_Segmento
INNER JOIN dbo.TB_SubSegmentoVeiculo AS F ON D.CD_SubSegmento = F.CD_SubSegmento
INNER JOIN dbo.TB_Fabricante AS G ON D.CD_Fabricante = G.CD_Fabricante


The following query is not getting perfomance. I don't what's going on.

SELECT COUNT(*)
FROM VW_Emplacamentos
WHERE DT_Emplacamento BETWEEN '20040301' AND '20040316'
AND NM_Fabricante = 'VW'

I've created an compost index on the following sequece
DT_Emplacamento,NM_Fabricante,NM_Segmento

But it still slow.

I really apreciate comments.

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Jul 10, 2007

I recently added several indexed views to a high traffic table (high volume of both inserts and selects) because I needed to have some complicated unique constraints involving columns that allow NULL.

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Jul 20, 2005

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Thanks,
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Jun 23, 2006

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This is what I have so far,

CREATE VIEW InvoiceBasic AS
SELECT VendorName, InvoiceNumber, InvoiceTotal
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ON Vendors.VendorID = Invoices.VendorID

[code]...

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I tried:

CREATE VIEW [qryMyView]
AS
EXEC pr_MyProc


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Anybody able to help me out please?

Cheers!

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Please help.

Thanks.

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Point And Click DTS

Mar 19, 2007

i have a DTS Package a saved when i set up the package. it's in local packages in Enterprise Manager now. is there any way i can simply set up a shortcut on my desktop to execute that DTS, rather then having to nav though Enterprise Manager?

yeah, i know i'm lazy :o)

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