Why The Function And Batch With Same Sql Statement Have Different Performance?

Jan 3, 2008



hi all,

I have a function and batch witch consisted of same sql statement, and they will get the same result. but time they take is different, and produce a little different query plans, another significant difference is the estimated numbers. the function is always slower than the batch.

does anyone know why same sql would produce different query plans performance? how do i can to let the function as fast as the batch?

thanks!

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Performance Issues And Tuning (Rows Per Batch, MICS, Etc.)

Mar 6, 2008

I built an SSIS package to pull a large amount data (over 4 million records) from our legacy system into a SQL server for analysis. As it stands the package takes somethign like 30+ hours to run. I would really like to trim down the time it is taking. The process runs monthly.

We're connecting to a cache database via an ODBC connection and dumping to an OLEDB connection to the SQL server. Is there something I can change in the rows per batch, maximum commit size to improve performance. It looks like the ODBC connection returns chunks of about 3000 rows at a time.

Is anyone familiar with cache that might know where I can get the best performing ODBC driver from?

What about the table that I'm dumping the data to? I assume no (or very few) indexes is the way to go for speed of dropping the data into the table.

I don't feel that 30 hours is an acceptable amount of time for this process to run. Am I off base here?

Any tips would be appreciated.

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Sep 26, 2005

Hi There,

I want to able to run a batch of sql statments (execute procedures) in SQl Server at a specific time. Just wondering if there is a method for that.

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May 7, 2015

I have written the following code:
 
SET NOCOUNT ON
DECLARE @RowCount int; SET @RowCount = 0;
Begin Try
Begin Transaction
--------------------------------------------------------
-----Table Name: AlertsStaticRecord_Archive
-----Column Name: AlertID
--------------------------------------------------------
ALTER TABLE  [AlertsStaticRecord_Archive]  ALTER COLUMN [AlertID] int NOT NULL;

[Code] .....

But, when I execute these batch, I am getting error:

Msg 8111, Level 16, State 1, Line 11
Cannot define PRIMARY KEY constraint on nullable column in table 'AlertsStaticRecord_Archive'.
Msg 1750, Level 16, State 0, Line 11
Could not create constraint. See previous errors.

Because, the first ALTER statement is not getting executed.

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Mar 17, 2008

The following exception is thrown with sqljdbc.jar (not with jtds0.9.jar)

com.microsoft.sqlserver.jdbc.SQLServerException: New request is not allowed to start because it should come with valid transaction descriptor.
at com.microsoft.sqlserver.jdbc.SQLServerException.makeFromDatabaseError(Unknown Source)
at com.microsoft.sqlserver.jdbc.TDSTokenHandler.onEOF(Unknown Source)
at com.microsoft.sqlserver.jdbc.TDSParser.parse(Unknown Source)
at com.microsoft.sqlserver.jdbc.TDSParser.parse(Unknown Source)
at com.microsoft.sqlserver.jdbc.SQLServerConnection$1ConnectionCommand.doExecute(Unknown Source)
at com.microsoft.sqlserver.jdbc.TDSCommand.execute(Unknown Source)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.executeCommand(Unknown Source)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.connectionCommand(Unknown Source)
at com.microsoft.sqlserver.jdbc.SQLServerConnection.rollback(Unknown Source)
at org.apache.commons.dbcp.DelegatingConnection.rollback(DelegatingConnection.java:265)
at org.apache.commons.dbcp.PoolingDataSource$PoolGuardConnectionWrapper.rollback(PoolingDataSource.java:288)


While using the query :


if not exists ( select 1 from sysindexes where id = object_id('aaa') and name = 'aaa_pk')create unique nonclustered index aaa_pkon aaa(id)using Statement.executeBatch()at conection.commit()

Sample Code

conn = getConnection();

// create the statement and execute the query
Statement stmt = null;
try
{
conn.setAutoCommit(false);
stmt = conn.createStatement();
for ( String sql : sqlList )
{
stmt.addBatch( sql );
}

results = stmt.executeBatch();
stmt.clearBatch();
conn.commit(); //throws the exception
}
catch ( SQLException e )
{
try
{
conn.rollback();
}
catch ( SQLException e1 )
{
throw new DataSourceException( e1 );
}
throw new DataSourceException( "Error executing sql: %1", e, sqlList.toString() );
}

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Is there a way to create a Batch file that will run an Update Statement and schedule it to run?I've used bcp to extract data to a txt file before, but i'm not sure if an Update can be performed.I'm using SQL Server 2008 R2 Express Edition so i don't have Server Agent available.

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Feb 13, 2004

Just Like these:

-- batch start
Select * from someTable --maybe a query which need much res(I/O,cpu,memory)

/*
can I do something here to free res used by prior statement?
*/

select * from someOtherTable
--batch end

The Sqls above are written in a procedure to automating test for some select querys.

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Oct 27, 2005

can anyone explain to me why the code excerpt 1 performs 60 reads on my DB, and code excerpt 2 performs 140000 ?


I know that specifically the statements are doing different things but they are both inserting into tables based on input parameters.

All relevant fields are indexed so I wouldn't have thought this was the issue?

Does the number of joins really make such a difference to performance?


code excerpt 1 (60 reads)
INSERT INTO @table_var
SELECT dbo.Organisation.OrganisationName,
dbo.Organisation.DepartmentName,
dbo.Address.BuildingNumber,
dbo.BuildingName.BuildingName,
dbo.SubBuildingName.SubBuildingName,
Thoroughfare_1.ThoroughfareName AS DependentThoroughfareName,
ThoroughfareDescriptor_1.ThoroughfareDescriptor AS DependentThoroughfareDescriptor,
dbo.Thoroughfare.ThoroughfareName,
dbo.ThoroughfareDescriptor.ThoroughfareDescriptor,
dbo.Locality.DoubleDependentLocality,
dbo.Locality.DependentLocality,
dbo.Locality.PostTown,
dbo.Address.Outcode,
dbo.Address.Incode,
dbo.Address.ConcatenationIndicator
FROM dbo.Address INNER JOIN
dbo.BuildingName ON dbo.Address.BuildingNameKey = dbo.BuildingName.BuildingNameKey INNER JOIN
dbo.Locality ON dbo.Address.LocalityKey = dbo.Locality.LocalityKey INNER JOIN
dbo.Organisation ON dbo.Address.OrganisationKey = dbo.Organisation.OrganisationKey AND
dbo.Address.PostcodeType = dbo.Organisation.PostcodeType INNER JOIN
dbo.SubBuildingName ON dbo.Address.SubBuildingNameKey = dbo.SubBuildingName.SubBuildingNameKey INNER JOIN
dbo.Thoroughfare ON dbo.Address.ThoroughfareKey = dbo.Thoroughfare.ThoroughfareKey INNER JOIN
dbo.ThoroughfareDescriptor ON dbo.Address.ThoroughfareDescriptorKey = dbo.ThoroughfareDescriptor.ThoroughfareDescriptorK ey INNER JOIN
dbo.Thoroughfare Thoroughfare_1 ON dbo.Address.DependentThoroughfareKey = Thoroughfare_1.ThoroughfareKey INNER JOIN
dbo.ThoroughfareDescriptor ThoroughfareDescriptor_1 ON
dbo.Address.DependentThoroughfareDescriptorKey = ThoroughfareDescriptor_1.ThoroughfareDescriptorKey
WHERE (dbo.Address.AddressKey = @addresskey) AND
(dbo.Address.OrganisationKey = @organisationkey) AND
(dbo.Address.PostcodeType = @postcodetype)




code excerpt 2:


INSERT INTO @table_var_out
SELECT dbo.Organisation.OrganisationName, dbo.Address.OrganisationKey, dbo.Address.AddressKey, dbo.Address.PostcodeType
FROM dbo.Address INNER JOIN
dbo.Organisation ON dbo.Address.OrganisationKey = dbo.Organisation.OrganisationKey AND
dbo.Address.PostcodeType = dbo.Organisation.PostcodeType
WHERE (dbo.Address.Outcode = @outcode) AND (dbo.Address.Incode = @incode)

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I need to know what is the best performance for needing to do calculations for a particular column. I want to do something like:


Select IID
, ItemNo
, StdRun
, ActRun
, dbo.fnCalc(OutCount)
From myTable


The function is basically a set of Case Statements and various calculations dependant upon the Case.

Is this the best (performance wise) way to do it or should I dump the needed info in a Temp Table and do the calcs on it and then tie the select statement to the table.

I've seen both approaches done, but they both seem to be a different way of getting to the same conclusion. I'm just wondering which puts the lightest load on the server.

Thanks,
Tim

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Oct 18, 2007

Hi,

I've tried the following query in SQL SERVER 2005, SQL Express and MACCESS.

select * from Table1 where drid in (SELECT DrID FROM Table2 WHERE (substring(PostalCode,1,3) IN ('B0E','B1P','B2H','B2Y','B3A','B3M','B4A','B4H','E1A','E1C','E1N','G0A', …)) and (substring(Telephone,1,3) IN ('204','250','306','403','416','418','450','506','514','519','604','613','705','780','807','819','902','905')))

The query is using two table. The first one Table1 is a table with user info. The second table Table2 has the info concerning a survey.

The Table1 containt approx. 6000 row and Table2 containt only 210 rows

The table structure from the different environment(MACCESS, SQL SERVER 2005, Sql Server Express 2005) are the same. The Table1 containt the field "PostalCode" and "Telephone".

When I execute this query on MACCESS and in SQL Server 2005 the result are approximately the same(Less than half second). But there a performance issue in Sql Express 2005. The query take an execution time between 7 and 9 secondes.

When I add a condition using a field from tblResponsePQ2Part1 ex: QA=1
like in the following query :
select * from Table1 where drid in (SELECT DrID FROM Table2
WHERE (QA = 1 substring(PostalCode,1,3) IN ('B0E','B1P','B2H','B2Y','B3A','B3M','B4A','B4H','E1A','E1C','E1N','G0A', …)) and (substring(Telephone,1,3) IN ('204','250','306','403','416','418','450','506','514','519','604','613','705','780','807','819','902','905')))
the query take an execution time of ~15 secondes!!!!

This issue only happen in Sql Server Express, on the others cases(mean MSAccess, Sql Server) the execution time is less than half second.

It’s weird because, Sql Express 2005 is supposed to be more performant
than MACCESS, and have the same performance than Sql Server Professional Edition. Please Help Me!!!!


Anyone have an idea why?



Mathieu Desbiens

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Mar 11, 2008

What is better for performance, using a user defined function or a sub query to perform an aggregate calculation in a select statement. for eg would it be best to call a user defined function which performs the below calculation of the sub query shown. I'm speaking purely from a performance point of view.


SELECT o.ordersid,


o.orders,

(SELECT SUM(i.total) FROM items AS i WHERE i.ordersid = o.ordersid) AS [total]

FROM order AS o

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Mar 31, 2008

I am using SQL2005 EE with SP1. The server OS is windows 2K3 sp2

I have a table-valued function (E.g. findAllCustomer(Name varchar(100), gender varchar(1)) to join some tables and find out the result set base the the input parameters.

I have created indexes for the related joinning tables.

I would like to check the performance of a table-valued function and optimize the indexing columns by the execution plan.

I found the graphic explanation only show 1 icon to represent the function performance. I cannot find any further detail of the function. (E.g. using which index in joinning)

If I change the function to stored procedure, I can know whether the T-SQL is using index seek or table scan. I also found the stored procedure version subtree cost is much grether that the table-valued function

I would like to know any configureation in management studio can give more inform for the function performance?

Thanks


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Aug 2, 2007

When I am executing a query that uses a mathematical function on values from 2 tables the query takes much longer than the same query that uses values from 1 table, even though the join remains the same.

Why is this happening?
Is there a way to bypass this problem?

Long query ( values from 2 tables ) :
SELECT
MAX ( ( SIGN ( attribute.keyValue- ( -2027587559 ) ) *SIGN ( attribute.keyValue- ( -2027587559 ) ) -1 ) *-1*data.val ) AS maxVal
FROM
DATA data,
ATTR attribute,
TREE_ELEMENT elm,
TREE_ELEMENT subject
WHERE
data.elmId=elm.id
AND attribute.keyValue IN ( 345647222,1569153803,1569146115,-2027587559 )
AND subject.id=elm.subjectId
AND subject.name = ‘test’


Short query ( values from 1 table ) :
SELECT
MAX ( ( SIGN ( data.keyValue- ( -2027587559 ) ) *SIGN ( data.keyValue- ( -2027587559 ) ) -1 ) *-1*data.val ) AS maxVal
FROM
DATA data,
ATTR attribute,
TREE_ELEMENT elm,
TREE_ELEMENT subject
WHERE
data.elmId=elm.id
AND attribute.keyValue IN ( 345647222,1569153803,1569146115,-2027587559 )
AND subject.id=elm.subjectId
AND subject.name = ‘test’


Long query execution plan:
Execution Tree
--------------
Stream Aggregate ( DEFINE: ( [Expr1004]=MAX ( ( sign ( [attribute].[keyValue]--2027587559 ) *sign ( [attribute].[keyValue]--2027587559 ) -1 ) * ( -1*[data].[val] ) ) ) )
|--Nested Loops ( Inner Join )
|--Hash Match ( Inner Join, HASH: ( [elm].[id] ) = ( [data].[elmId] ) , RESIDUAL: ( [data].[elmId]=[elm].[id] ) )
| |--Nested Loops ( Inner Join, OUTER REFERENCES: ( [subject].[id] ) )
| | |--Index Seek ( OBJECT: ( [TREE_ELEMENT].[TREE_ELEMENT_NAME_IDX] AS [subject] ) ,
SEEK: ( [subject].[name]=’test’ ) ORDERED FORWARD )
| | |--Index Seek ( OBJECT: ( [TREE_ELEMENT].[TREE_ELEMENT_APP_ID_IDX] AS [elm] ) ,
SEEK: ( [elm].[subjectId]=[subject].[id] ) ORDERED FORWARD )
| |--Clustered Index Scan ( OBJECT: ( [DATA].[PK__DATAS_SAMPL__485B9C89] AS [data] ) )
|--Table Spool
|--Index Seek ( OBJECT: ( [ATTR].[TREE_Z_IDX] AS [attribute] ) ,
SEEK: ( [attribute].[keyValue]=-2027587559 OR [attribute].[keyValue]=345647222 OR [attribute].[keyValue]=1569146115 OR [attribute].[keyValue]=1569153803 ) ORDERED FORWARD )



Short query execution plan:
Execution Tree
--------------
Stream Aggregate ( DEFINE: ( [Expr1004]=MAX ( [partialagg1005] ) ) )
|--Nested Loops ( Inner Join )
|--Stream Aggregate ( DEFINE: ( [partialagg1005]=MAX ( ( sign ( [data].[keyValue]--2027587559 ) *sign ( [data].[keyValue]--2027587559 ) -1 ) * ( -1*[data].[val] ) ) ) )
| |--Hash Match ( Inner Join, HASH: ( [elm].[id] ) = ( [data].[elmId] ) , RESIDUAL: ( [data].[elmId]=[elm].[id] ) )
| |--Nested Loops ( Inner Join, OUTER REFERENCES: ( [subject].[id] ) )
| | |--Index Seek ( OBJECT: ( [TREE_ELEMENT].[TREE_ELEMENT_NAME_IDX] AS [subject] ) ,
SEEK: ( [subject].[name]=’test’ ) ORDERED FORWARD )
| | |--Index Seek ( OBJECT: ( [TREE_ELEMENT].[TREE_ELEMENT_APP_ID_IDX] AS [elm] ) ,
SEEK: ( [elm].[subjectId]=[subject].[id] ) ORDERED FORWARD )
| |--Clustered Index Scan ( OBJECT: ( [DATA].[PK__DATAS_SAMPL__485B9C89] AS [data] ) )
|--Index Seek ( OBJECT: ( [ATTR].[TREE_Z_IDX] AS [attribute] ) ,
SEEK: ( [attribute].[keyValue]=-2027587559 OR [attribute].[keyValue]=345647222 OR [attribute].[keyValue]=1569146115 OR [attribute].[keyValue]=1569153803 ) ORDERED FORWARD )

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Hi,
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BEGIN
DECLARE @PersonID integer
set @PersonID=0
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ELSE
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BEGIN
IF @LastName is not null and @FirstName is not null and @MiddleName is not null and @NamePrefix is not null and @NameSuffix is not null
Begin
select MIN(lngPersonID) AS PersonID from Persons
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ELSE
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BEGIN
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END
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I m having problem with the "Select" function
the error I m getting is
Select statements included within a function cannot return data to a client (error 444)


Cann I use "select" statement in the function? If not what is the alternative?


I reduced the size of the sproc because it is a big one, I donn have any proble with syntax.





Thanks

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From template_audit a
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end
GO

This throws error like this:
Invalid use of side-effecting or time-dependent operator in 'DELETE' within a function.

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Replace Function In Sql Statement

Oct 15, 2007

how should i use replace function in sql statement??

in my scenario, user enters the meeting ID and i want that if user enters the meeting ID which includes apostrophe('), the stored procedure should remove the apostrophe before inserting it into database table.

my stored procedure accepts two parameters.
Is there any way to solve my problem??


Jaimin

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May 22, 2008

Hi,

I've got a complex UDF I need to call twice in a select statement, as shown below:

SELECT

dbo.myFunction(colName),
dbo.myFunction(colName) * 2
FROM

tableName

The problem is, the result of "dbo.myFunction(colName)" is not being cached, so the function is executed again for "dbo.myFunction(colName) * 2". This is having a significant impact on performance (doubling the amount of time it takes for the query to execute).

Is there any way I can write the query so that dbo.myFunction is only executed once?

Thanks for your help,

Andrew

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Feb 25, 2008



Hi,

I have a Query some thing like this,

Select Table1.Code, 'field2' = CASE




WHEN 1 THEN (Select name From Table2 where Table2.Code=Table1.Code)
WHEN 2 THEN (Select name From Table3 where Table3.Code=Table1.Code)
WHEN 3 THEN (Select name From Table4 where Table4.Code=Table1.Code)
END

FROM Table1

Do I need to use Function instead of CASE for better performance ?


Regards

Mujeeb






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Aug 7, 2007

HELP,

I need to take a variable from a tabel in SQL Server pass to a Batch file and execute the batch file. Right now I can exec the batch file with XP_CMDSHELL but how can I pass the variable to the batch file and loop through all the variables.

Please help

Phil

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