know if there is any way out to run execution plan for parameterized queries?
As application is sending queries which are mostly parameterized in nature and values being used are very robust in nature, So i can not even make a guess.
I have same query but when executed from different server use different plan. when it runs on QA box it is faster and when it runs on PRD it is slow.
Is it possible to force SQL Server to use QA plan by giving a hint?
Is it possible to check query execution plan of a store procedure from create script (before creating it)?
Basically the developers want to know how a newly developed procedure will perform in production environment. Now, I don't want to create it in production for just checking the execution plan. However they've provided SQL script for the procedure. Now wondering is there any way to look at the execution plan for this procedure from the script provided?
HelloWhen I use a PreparedStatement (in jdbc) with the following query:SELECT store_groups_idFROM store_groupsWHERE store_groups_id IS NOT NULLAND type = ?ORDER BY group_nameIt takes a significantly longer time to run (the time it takes forexecuteQuery() to return ) than if I useSELECT store_groups_idFROM store_groupsWHERE store_groups_id IS NOT NULLAND type = 'M'ORDER BY group_nameAfter tracing the problem down, it appears that this is not preciselya java issue, but rather has to do with the underlying cost of runningparameterized queries.When I open up MS Enterprise Manager and type the same query in - italso takes far longer for the parameterized query to run when I usethe version of the query with bind (?) parameters.This only happens when the table in question is large - I am seeingthis behaviour for a table with > 1,000,000 records. It doesn't makesense to me why a parameterized query would run SLOWER than acompletely ad-hoc query when it is supposed to be more efficient.Furthermore, if one were to say that the reason for this behaviour isthat the query is first getting compliled and then the parameters aregetting sent over - thus resulting in a longer percieved executiontime - I would respond that if this were the case then A) it shouldn'tbe any different if it were run against a large or small table B) thisperformance hit should only be experienced the first time that thequery is run C) the performance hit should only be 2x the time for thenon-parameterized query takes to run - the difference in response timeis more like 4-10 times the time it takes for the non parameterizedversion to run!!!Is this a sql-server specific problem or something that would pertainto other databases as well? I there something about the coorect use ofbind parameters that I overall don't understand?If I can provide some hints in Java then this would be great..otherwise, do I need to turn/off certain settings on the databaseitself?If nothing else works, I will have to either find or write a wrapperaround the Statement object that acts like a prepared statement but inreality sends regular Statement objects to the JDBC driver. I wouldthen put some inteligence in the database layer for deciding whetherto use this special -hack- object or a regular prepared statementdepending on the expected overhead. (Obviously this logic would onlybe written in once place.. etc.. IoC.. ) HOWEVER, I would desperatelywant to avoid doing this.Please help :)
View 1 Replies View RelatedI want to find out more information about the execution plan. I saw Parallelism (Gather Streams) in the excution plan. In what situation we can see this icon?If in case if we need to avoid how can we avoid this?
View 5 Replies View RelatedWe have got a query for fine tuning and it is using lot of CTE ,how can i check the execution plan of that?
CREATE VIEW Mercy
AS
with ADR
as
(
SELECT urpx.RoleID ,
urx.UserID
FROM [DBA].dbo.URPX WITH ( NOLOCK )
INNER JOIN [DBA].dbo.URX WITH ( NOLOCK ) ON urpx.RoleID = urx.RoleID
WHERE PermissionID = '1'
),
SDR
as
(
-- Collect the roles that a configured with Sales Team Create permission
-- This will include Sales Director , Suite Admin,
SELECT urpx.RoleID
FROM [DBA].dbo.URPX WITH ( NOLOCK )
INNER JOIN [DBA].dbo.URX WITH ( NOLOCK ) ON urpx.RoleID = urx.RoleID
LEFT OUTER JOIN ADR ON ADR.UserID = urx.UserID
WHERE ADR.RoleID IS NULL
AND PermissionID='2'
)
I have an execution plan that is huge, the pdf it generates if I print it is over 1000 pages. Is there a way to change the graphical plan into a table, so I can sort the %, and find the items that are taking the longest?
View 4 Replies View RelatedI have 2 tables,
1. Need
2. NeedCategory
Need table has clusted index on needid column and NeedCategory have composite clustered index on needid and categoryid.
Now take a look on following query and execution plan for the query.
SELECT N.NeedId,N.NeedName,N.ProviderName
FROM dbo.Need N
JOIN dbo.NeedCategory NC
ON nc.NeedId = n.NeedId
WHERE IsActive=1
AND CategoryId= 2
ORDER BY NeedName
* Clustered index scan on need table is happens for Isactive= 1.
* Clustered index scan on needcategory table is happens for CategoryId=2
My question is,
1. Why scan happens before the join occurs? if it happens after join then the filter would be lighter. Even if optimizer chooses the scan to execute first.
2. Is there any chance to rearrange the execution plan manually?
I'm in the process of trying to optimize a stored procedure with many queries. The execution plan provides a missing non-clustered index on nearly every query, and they're all fairly similar. The only real difference between them are what's in the INCLUDE statement. The two key columns are listed in every missing index. Let's say each query is approximately 5% of the total batch and 90% of the queries all fall into the category I listed above. How should I go about creating the missing indexes? Create all of the missing indexes or create one generic one that has all the INCLUDE columns? Create a minimal index with just a few of the common INCLUDE columns?
Here's an example of what I'm talking about with the missing indexes:
/*
USE [DB]
GO
CREATE NONCLUSTERED INDEX [<Name of Missing Index, sysname,>]
ON [dbo].[TABLE_1] ([COLUMN_A],[COLUMN_B])
INCLUDE ([C4ABCD],[C4ARTX],[C4ASTX],[C4ADNB],[C4AFNB],[C4BKVA])
GO
*/
/*
The Query Processor estimates that implementing the following index could improve the query cost by 99.9044%.
*/
/*
USE [DB]
GO
CREATE NONCLUSTERED INDEX [<Name of Missing Index, sysname,>]
ON [dbo].[TABLE_1] ([COLUMN_A],[COLUMN_B])
INCLUDE ([C4ARTX],[C4ASTX],[C4ADNB],[C4CZST])
GO
*/
/*
The Query Processor estimates that implementing the following index could improve the query cost by 99.5418%.
*/
/*
USE [DB]
GO
CREATE NONCLUSTERED INDEX [<Name of Missing Index, sysname,>]
ON [dbo].[TABLE_1] ([COLUMN_A],[COLUMN_B])
INCLUDE ([C4ABCD],[C4ARTX],[C4ASTX],[C4ADNB],[C4AFNB],[C4BKVA])
GO
*/
I'm new to using SQL Server. I've been asked to optimize a series of scripts that queries over 4 millions records. I've managed to add indexes and remove a cursor, which increased performance. Now when I run the execution plan, the only query that cost is a DELETE statement from the main table. It shows a SORT which cost 71%. The table has 2 columns and a unique index. Here is the current index:
ALTER TABLE [dbo].[Qry] ADD CONSTRAINT [Qry_PK] PRIMARY KEY NONCLUSTERED
(
[QryNum] ASC,
[ID] ASC
)WITH (PAD_INDEX = OFF, STATISTICS_NORECOMPUTE = ON, SORT_IN_TEMPDB = OFF, IGNORE_DUP_KEY = OFF, ONLINE = OFF, ALLOW_ROW_LOCKS = ON, ALLOW_PAGE_LOCKS = ON) ON [PRIMARY]
GO
Question: Will the SORT affect the overall performance? If so, is there anything I should change within the index that would speed up my query?
Hello ,
I wanted to know whether we have an execution plan enabled in SQL 6.5 as we have it in SQL 7.0 and SQL 2000 .
I.e when we execute a query and if we enable ' show execution plan 'then it creates a map and shows the vital statistics .
If that is available on SQL 6.5 then i am missing that tool .
How can i have it installed on my SQL 6.5 server ??
Thanks.
SQL Server 2012 Performance Dashboard Main advices me this:
Since the application is from a vendor and I have no control over its code, how can improve this sitation?
if t-sql query is perfectly run in development and when I execute in production at that time I want to use execution plan which is in development . so how I can do using cache? I know about hint we can use hint USE_PLANE. but I want to do with cache .
View 1 Replies View RelatedThis is probably a very stupid question. I have been out of the SQL Server arena for awhile and am now getting re acclimated. It was my understanding that using execution plan in query analyzer does not really execute the query against the query's database tables. Is this right? Tom.
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Hi,
I am developing an application (VB) that should present a query estimated execution plan.
Using the SQL Server Management Studio, I should execute the following commands to see the query's estimated execution plan:
SET SHOWPLAN_XML ON
go
MyQuery
go
SET SHOWPLAN_XML OFF
go
The query is not executed. The result is the query execution plan.
In my application, I call Connection.Execute to execute the 'SET SHOWPLAN_XML ON'. Then, I use a Resultset submit the query. The query is executed and the execution plan is not returned.
Does anyone have any ideas?
Thanks
what does query cost(retrive to the batch) mean in execution plan?
what is the differeence between query cost :100% and 65%?
The benefit of the actual execution plan is that you can see the actual number of rows passing through each step - compared to the estimated number of rows.But what about the "cost percentages" ?I believe I've read somewhere that these percentages is still just an estimate and is not based on the real execution.Does anyone know this and preferable have a link to something that documents it?Thanks
View 1 Replies View RelatedI have SQL 7.0 SP2 on NT 4.0 SP5. My database is 180GIG. 23 Tables. It has been up and running for 2 years without any problems. All of a sudden my queries have started taking a long time to run. The optimizer has decided that table scans are better than indexes. If I use query hints they work just fine, but I can't modify all of our code to make these changes.
This is happening on all tables. Records counts are the in the same range they have always been.
Statistics and indexes are all fine and current. Have dropped and rebuilt both.
Has anybody else seen this behavior.
Hi All,
I have to get some knowledge in Query Execution Plan.
Is there any links which i can refer for the same
Thanks,
Muthu
I am trying to tune a very long running query (18 minutes on an Axim X51, 8secs on my laptop), but I can't get the query plan file that is generated on the device to load in the Sql Server Management Studio. I am using the Sql Everywhere CTP on the device, and version 9.00.2047 of the management studio shell.
FWIW, when I try to create the execution plan by running the same query on a .sdf file local on my laptop, I get a similar error trying to view the query plan.
Apart from the query plan issues, it would appear (just from the query execution time) that the indexes defined on the sdf file are not being used when executing the query on the device, but are being used when executing the query on the laptop. This is pure SWAG on my part, though.
I can't figure out how to attach a file to the post, unfortunately.
Thanks for any help you can offer.
Matthew Belk, BizSpeed, Inc.
From MS Dynamics NAV 2013 I get a lot of querries that have a where clause like this:
where [Field1] like @p1 and [Field1] < @p2.
Field1 is the only primary key field and clustered index. The query also has a TOP 50 clause.
@p1 is always a "Starts-With"-value (something like N'abc%').
The query plan uses a clustered index seek but the number of reads look more like a clustered index scan.
Depending on the table size I see 1M or more reads for these querries.
If I rebuild the query in SSMS, but replace the paramerters with actual values I only see a few reads.
I was able to reproduce the issue with a temp table. See code below.
Is there a way to make SQL Server use another strategy when using the parameterized query?
SQL Server Version is 11.0.3401.
if object_id('tempdb..#tbl') is not null
drop table #tbl;
create table #tbl
(
[No] nvarchar(20)
,[Description1] nvarchar(250)
[Code] ....
Hi,I have a question about estimated query execution plans that aregenerated in QA of MSSQL.If I point at an icon/physical operator in the estimated QEP, it showsmesome statistics about the operator.Is there a way to retrieve these statistics through a query, i.e., canthese statistics be available to the user?Also, is there a way to generate these statistics on my own?thanks in advance-TC.
View 2 Replies View RelatedHi All,I'm a relative newbie to SQL Server, so please forgive me if this is adaft question...When I set "Show Execution Plan" on in Query Analyzer, and execute a(fairly complex) sproc, I note that a particular query is reported ashaving a query cost of "71% relative to the batch" - however, this isnowhere near the slowest executing query in the batch - other querieswhich take over twice as long are reported as having costs in theorder of a few percent each.Am I misreading the execution plan? Note that I'm looking at thegraphical plan, and am not reading the 'estimated' plan - I'm usingthe one generated from executing the sproc. My expectation was thatthis would be based on the execution times of the queries within thesproc, however, this does not appear to be the case. (Note - Idetermined execution times from PRINT statements, using GETDATE() todetermine the current time, down to milliseconds).Any feedback would be of great assistance... I may well have tochange the way I approach optimizing queries based on these findings.Thanks,LemonSmasher.
View 3 Replies View RelatedDoes anyone know if it is possible to access the execution plan results programmatically through a stored procedure or .NET assembly? I have the code sample
SET SHOWPLAN_XML ON; query... SET SHOWPLAN_XML OFF;
but it can only be run from the interface. I have tried a couple of solutions including dynamic sql to try to capture the results in a variable or file with no luck.
Does anyone know of a way to programmatically capture this information? We are doing some research with distributed query processing of dynamically generated queries using multiple processing nodes, and it would be helpful to know an estimate of how large the query is before sending it away to be processed.
I have looked at the dm_exec_query_stats view; but it can only be run on a query that has already been executed. I need to know the execution plan before the query is executed. If there is a way to get a query to show up in this view without being executed, then that would work as well.
Thanks -- MT
Is it possible to check query execution plan of a store procedure from create script (before creating it)?
Basically the developers want to know how a newly developed procedure will perform in production environment. Now, I don't want to create it in production for just checking the execution plan. However they've provided SQL script for the procedure. Now wondering is there any way to look at the execution plan for this procedure from the script provided?
Hello..
Is there a way to use parameterized queries with RDA method? I write a program for WinCE5.0 and when I submit a query I use hardcoded date format and this causes problems in different systems.There's a solution for this?
Thanks in advance.
Just getting started using SSce and having a few problems
What I want to do is something like this...
Dim Code As Integer
Dim Description As String = txtDescription.Text.Trim
Dim conn As SqlCeConnection = ConnectToLocalDatabase()
Dim ssql As New System.Text.StringBuilder
ssql.AppendLine("INSERT INTO T_Titles (Description)")
ssql.AppendLine("VALUES(@Description)")
ssql.AppendLine("SELECT @Code = @@IDENTITY")
Dim cmd As New SqlCeCommand(ssql.ToString, conn)
Dim sqlCode As New SqlCeParameter("@Code", 0)
sqlCode.Direction = ParameterDirection.InputOutput
cmd.Parameters.Add(sqlCode)
cmd.Parameters.Add(New SqlCeParameter("@Description", Description))
cmd.ExecuteNonQuery()
Code = CInt(sqlCode.Value)
**********************************************************************
The above code doesnt work. Firstly I am not sure if I can execute the two statements in one go. Secondly, I am not sure if output parameters are supported.
I have been working with SQL Server since 6.5 but have always used sprocs and am feeling a little lost here without them. Any help getting started would be greatly appreciated.
Thanks
Hey fellas. Here's my situation. I have two textboxes where the user enters a "start" date and an "end" date. I want to search a table to find records who's "expired" column date is between those two dates provided by the user. The tricky part is, if the user just puts a start date in but no end date, I want it to search from whatever start date the user entered to the future and beyond. Essentially, I think I'm looking for a SQL statement along the lines of:
SELECT Request.RequestID, Request.URL, ActionProvider.Name, Request.CurrentStageID, Request.Decision, Request.SubmissionDate,
Request.ExpirationDate
FROM Request INNER JOIN
RequestSpecificActionProvider ON Request.RequestID = RequestSpecificActionProvider.RequestID INNER JOIN
ActionProvider ON RequestSpecificActionProvider.ActionProviderID = ActionProvider.ActionProviderID INNER JOIN
RoleActionProvider ON ActionProvider.ActionProviderID = RoleActionProvider.ActionProviderID INNER JOIN
Role ON RoleActionProvider.RoleID = Role.RoleID
WHERE
CASE WHEN @BeginDate is not null AND @BeginDate <> ''
THEN Request.ExpirationDate > @BeginDate
END
AND
CASE WHEN @EndDate is not null AND @EndDate <> ''
THEN Request.ExpirationDate > @EndDate
END
AND (Role.Description = 'Requestor')
I realize my code isn't correct and there's still a floating "AND" out there I would have to put some logic around. Anyway, how do I do this? Do I need to build three separate queries in my tableadapter (one for if both dates are provided, one for if start date is provided, one for if end date is provided) and build the logic in my application code or can I tackle it with SQL? If I can tackle it with SQL, where have I gone astray? I'm currently getting the error: "Error in WHERE clause near '>'. Unable to parse query text."
Thanks for the help everyone!
How would I debug such a query.
I have a sqlCommand to which I add several parameters for an insert statement.
if the statement fails, for some reason, I would like to copy the final sql with all values inserted as text and use this in e.g. TOAD to see where the error is coming from. Is this possible?
Hi,
I need to use parameters with the IN clause in a SQL statement like:
select * from tableX where field IN (1,2,3,4)
I don't know how to do that.
I'm using SQLServer and OleDB.
Thanks for your help.
I have a SQL stored procedure like so:
CREATE PROCEDURE sp_PRO
@cat_num nvarchar (10) ,
@descr nvarchar (200) ,
@price DECIMAL(12,2) ,
@products_ID bigint
AS
insert into product_items (cat_num, descr, price, products_ID) values (@cat_num, @descr, @price, @products_ID)
when I try and insert something like sp_PRO '123154', 'it's good', '23.23', 1
I can't insert "'" and "," because that is specific to how each item is delimited inorder to insert into the stored procedure. But if I hard code this into a aspx page and don't create a stored procedure I can insert "'" and ",". I have a scenario where I have to use a stored procedure...confused.
I have an application where users can enter data into any (or all) of 6 search fields,
to produce a filtered query.
This works fine using my Access version(see code below),
but as SQLS2k cannot use "IIF", I tried to replace these bits with
"CASE/WHEN/THEN/ELSE" lines, which does not work with numeric fields
as these cannot be "wild-carded" in the same way as Access allows.
Can anyone suggest a way forward that does not involve coding all the
possible permutations of "SELECT" blocks driven by lots of nested "IF/THEN/ELSE"s?
Hoping you can help
Alex
PARAMETERS
CurrentType Text,
CurrentCategoryID Long,
CurrentProductID Long,
CurrentClientID Long,
CurrentContractID Long,
FromDate DateTime,
ToDate DateTime;
SELECT
tAudit.AuditID,
tAudit.ActionType,
tAudit.ClientID,
tClients.ContactCompanyName,
tAudit.ContractID,
tContracts.ClientRef,
tAudit.ProductID,
tProducts.ProductName,
tAudit.CategoryID,
tCategories.CategoryName,
tAudit.Acknowledged,
tAudit.ValueAmount,
tAudit.DateStamp
FROM (((tAudit
LEFT JOIN tCategories
ON tAudit.CategoryID = tCategories.CategoryID)
LEFT JOIN tClients ON tAudit.ClientID = tClients.ClientID)
LEFT JOIN tContracts ON tAudit.ContractID = tContracts.ContractID)
LEFT JOIN tProducts ON tAudit.ProductID = tProducts.ProductID
WHERE (((tAudit.ActionType) Like IIf(IsNull([CurrentType]),"*",[CurrentType]))
AND ((tAudit.ClientID) Like IIf(IsNull([CurrentClientID]),"*",[CurrentClientID]))
AND ((tAudit.ContractID) Like IIf(IsNull([CurrentContractID]),"*",[CurrentContractID]))
AND ((tAudit.ProductID) Like IIf(IsNull([CurrentProductID]),"*",[CurrentProductID]))
AND ((tAudit.CategoryID) Like IIf(IsNull([CurrentCategoryID]),"*",[CurrentCategoryID]))
AND (([tAudit].[DateStamp]) Between [FromDate] And [ToDate]));
Is there any easy way to pass (dynamically) parameters to pass-throughqueries,when working with MS Access as front-end for SQL Server ?Thanks.
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