Query Optimizer/Wrong Execution Plan
Jul 6, 2001
I 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.
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Jan 15, 2007
Hi
I am having a query
SELECT Dur1.rootId
FROM DurableEventTab Dur1
WHERE (Dur1.dev_ReferenceClusterRoot = 'iyrwd.52' )
AND Dur1.dev_Action = 'Order:Ordered')
AND (Dur1.dev_Active = 1) AND (Dur1.dev_PurgeState = 0)
AND (Dur1.dev_PartitionNumber = 0)
This table has a primary key : aribapk11
and the indexes on the dev_ReferenceClusterRoot,
dev_Action,dev_purgestate .
Now when I fire this query
the query execution plan is actaull doing a Clustered Index scan on the PK :aribaPK11 . What I was expecting was an index seek on the key defined on dev_referenceClusterRoot. Please not the index seek is the behaviour in sql server 2000.
Any idea what is going wrong ?
Clustered Index Scan(OBJECT:([typhoon1902].[dbo].[DurableEventTab].[AribaPK7] AS [Dur1]), WHERE:([typhoon1902].[dbo].[DurableEventTab].[dev_Active] as [Dur1].[dev_Active]=(1.) AND [typhoon1902].[dbo].[DurableEventTab].[dev_PurgeState] as [Dur1].[dev_PurgeState]=(0) AND [typhoon1902].[dbo].[DurableEventTab].[dev_PartitionNumber] as [Dur1].[dev_PartitionNumber]=(0) AND [typhoon1902].[dbo].[DurableEventTab].[dev_ReferenceClusterRoot] as [Dur1].[dev_ReferenceClusterRoot]='iyrwd.52' AND [typhoon1902].[dbo].[DurableEventTab].[dev_Action] as [Dur1].[dev_Action]=N'Order:Ordered')) 0 0 Clustered Index Scan Clustered Index Scan OBJECT:([typhoon1902].[dbo].[DurableEventTab].[AribaPK7] AS [Dur1]), WHERE:([typhoon1902].[dbo].[DurableEventTab].[dev_Active] as [Dur1].[dev_Active]=(1.) AND [typhoon1902].[dbo].[DurableEventTab].[dev_PurgeState] as [Dur1].[dev_PurgeState]=(0) AND [typhoon1902].[dbo].[DurableEventTab].[dev_PartitionNumber] as [Dur1].[dev_PartitionNumber]=(0) AND [typhoon1902].[dbo].[DurableEventTab].[dev_ReferenceClusterRoot] as [Dur1].[dev_ReferenceClusterRoot]='iyrwd.52' AND [typhoon1902].[dbo].[DurableEventTab].[dev_Action] as [Dur1].[dev_Action]=N'Order:Ordered') [Dur1].[rootId] 1 0.00386574 0.0002263 71 0.00409204 [Dur1].[rootId] PLAN_ROW 0 1
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Sep 24, 2002
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.
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Oct 6, 2015
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?
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May 15, 2015
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?
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Jun 5, 2015
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 .
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Jan 31, 2008
This 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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Sep 15, 2007
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
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Apr 13, 2008
what does query cost(retrive to the batch) mean in execution plan?
what is the differeence between query cost :100% and 65%?
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Jul 7, 2006
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
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Apr 23, 2008
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
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Oct 26, 2006
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.
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Jul 21, 2014
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.
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Jul 20, 2005
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.
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Jul 20, 2005
Hi 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.
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Mar 19, 2007
Does 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
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Jun 17, 2015
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?
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Jun 17, 2015
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?
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Jul 23, 2005
I have one query that executes many times in a week.I created one Maintenances plan that Rebuild all index in my Database thathas been executed at 23:40 Saturday until stop finished at Sunday.However at middle of week (Wednesday or Thursday), that query don’t returnresult like that must be. The time exceeded and the result are total wrong.I compare the normal executed plan and the “crazy” one that SQL create tomount result.The normal is nested with index seek (very fast, the wrong is Merger withhash aggregate (very slow). After Index Rebuild, the executed plan bringresult that must be, but when the merge plan are executed with many updateson that tables (SAM_GUIA_EVENTO and SAM_GUIA), at middle of week, theresult are total wrong, with many rows back.I recommended Index Seek force by coalesce function on one columnaggregate, but everyone here were very panic with that behavior of SQLServer.Please , anyone help me to explain that!Krisnamourt!P.S: Attachments :--Force Index Query with coalesceSELECT count(*)FROM SAM_GUIA_EVENTOS E,SAM_GUIA GWHERE G.PEG=736740AND E.GUIA=coalesce(G.HANDLE,G.HANDLE) AND E.CLASSEGERENCIALPAGTO is NULL--Normal QuerySELECT count(*)FROM SAM_GUIA_EVENTOS E,SAM_GUIA GWHERE G.PEG=736740AND E.GUIA=G.HANDLE AND E.CLASSEGERENCIALPAGTO is NULL--Message posted via http://www.sqlmonster.com
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Jul 12, 2001
Hello,
I have a SQL command which I run on two separate servers. Both servers and configured and built the same. On server 1 it takes mere seconds, but on server 2 it takes over 5 minutes.
I have checked the execution plan on both servers and they are completely different. I ran UPDATE STATISTICS WITH FULLSCAN on both servers, but the execution plans were still different.
My question is why are the execution plans so different and how do I get them to execute with the same plan.
Thanks,
Chris.
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Feb 7, 2008
Hi,
Can some one please send me the Sql Server 2005 QUERY OPTIMIZER artilce links?
Thanks
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Apr 22, 2004
I'm looking for an in depth book, article, faq, whatever, regarding the query optimizer...
I've read the books online pretty thoroughly and have been sql coding for a number of years. The system I work on relies heavily on real time access to data and the number crunching procedures we use are a critical part of the design. For the most part, sometimes through trial and error, I have been able to find ways to achieve the performance we need, but I'm often surprised by the methods that prove most effective.
For example, I have cases where I can only get the performance I'm looking for using table functions, and other cases where indexed temporary tables are the only way. I have statements that run fast as a select statement, but when converted to an update statement limp along, forcing me to resort to cursors, temp tables, or table hints with varying degrees of success.
I'm wondering if anyone has come across material that takes an in depth look at the various technologies available and how to tweek queries. I want to get away from hours of testing and hacking.
Thanks for reading. All replies are appreciated.
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Jul 6, 1999
I am running a query showplan on a query. Can someone tell me how
to read what I am seeing? Or where I can get this information.
Thanks in advance,
Dianne
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Feb 5, 2008
One quick question.
Is query optimizer a tool in sql that optimizes your queries? If so how do you use it?
Thanks
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Aug 21, 2001
I'm new to SQL server but familiar enough with databases to know this doesn't seem right.
Here's the situation:
I have a table with real estate property information. There are about 650,000 rows in it. I have a nonclustered non-unique index on the city where the property is located. There are about 40 unique values in this index.
I do a simple query like:
SELECT city,address from propinfo where city= 'CARLSBAD'. The query will return about 4,000 rows. The problem is that the execution plan that it chooses is to do a full table scan. I.E. Even though there is an index on City, it chooses to look through 650,000 rows rather than do an index seek. Something sounds inefficient here. BTW, this happens in both SQL 7 and SQL 2000. Can anyone explain why this happens? I've got to think that SQL Server is more efficient here.
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Feb 2, 2006
Hello, I have been looking at the execution plan for a procedure call and the select, compute scalar, stream aggregates, constant scan, nested loops, asserts are all at 0% cost, the PK costs are 2% apart from a rogue 7% and a few 20%, tables scans are all at 23%. The query cost realtive to the batch is 100%. What does this all mean?
I have put non-clustered indexes on all the table attributes that are involved in the select statements but this has made no difference, i am guessing this is because my tables are not heavily populated and i may have seen a difference if i had thousands of entries in the tables the select statements acted on, is this assumption correct?
Does anyone else bother using the execution plan to tweak there DB or is it a negligible tool?
Jill
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Aug 29, 2007
In sql server 2005 management studio where do I find the option to run the sql query in the query analyser and also show the execution plan?
At present I see the option under Query menu which is "Display estimated Execution plan" which only shows the plan but does not execute the query.
Thanks
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Feb 29, 2008
Does anyone know of a good way to copy the execution plan when using "Include Actual Execution Plan"?
I often need to copy this and mail it.
I know I can use PrintScreen button, but I need a more efficient way to do this.
If I just could rightclick the execution plan and select "Copy" and get complete plan it would be great.
Mladen?
E 12°55'05.25"
N 56°04'39.16"
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Jul 20, 2005
Which of the following does NOT cause the execution plan of a query to berecompiled ?- new column is added to a table accessed by a query OR- index used by a query has been dropped from the database OR- query perfoms a join to return data from multiple tables OR- significant amount of data in a table has been mofified
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Jul 20, 2005
Hi,I have a table-valued user defined function (UDF) my_fnc.The execution of statement "select * from my_fnc" takes much longertime than runnig the code inside my_fnc (with necessary changes).What can be the reason?How can I see an execution plan used for UDF?Thanks a lotMartin
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Jun 27, 2007
I am trying to resolve performance issues in a third party application. I have run the profiler and found a transaction that performs a table scan against a 6 million row table. This transaction occurs repeatedly, so I thought, just add an index on the columns in the where clause used here. After adding the index, I looked at the estimated execution plan in Query analyzer, and I find that it is still performing the table scan. If I run the query it takes over 60 seconds to run, if i add an index hint, it runs in under a second. I ran DBCC SHOW_STATISTICS to see if the statistics were up to date:
Statistics for INDEX 'IX_Finish_dept'.
Updated Rows Rows Sampled Steps Density Average key length
-------------------- -------------------- -------------------- ------ ------------------------ ------------------------
Jun 26 2007 5:18PM 6832336 6832336 150 2.1415579E-7 18.0
(1 row(s) affected)
All density Average Length Columns
------------------------ ------------------------ ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
2.1875491E-7 8.0 finish
1.9796084E-7 18.0 finish, dept
(2 row(s) affected)
RANGE_HI_KEY RANGE_ROWS EQ_ROWS DISTINCT_RANGE_ROWS AVG_RANGE_ROWS
------------------------------------------------------ ------------------------ ------------------------ -------------------- ------------------------
1900-01-01 00:00:00.000 0.0 106110.0 0 0.0
2001-02-01 17:00:00.000 54121.0 47.0 22951 2.3581107
2001-02-28 17:00:00.000 44436.0 22.0 18121 2.4520473
2001-04-06 00:00:00.000 56830.0 76.0 24902 2.2820544
2001-08-10 17:00:00.000 196491.0 19.0 88800 2.2127116
2001-09-02 17:00:00.000 33070.0 50.0 15289 2.162993
2001-10-05 17:04:59.997 57975.0 30.0 22882 2.5335402
2001-11-05 15:31:59.997 50178.0 21.0 20899 2.4008613
2001-12-10 17:00:00.000 55266.0 38.0 25114 2.2006052
2002-01-03 17:00:00.000 40322.0 51.0 18649 2.1620376
2002-02-25 17:00:00.000 86338.0 24.0 39266 2.1987979
2002-08-15 06:11:00.000 296085.0 166.0 124526 2.3776772
2002-10-07 21:18:59.997 88727.0 826.0 39017 2.2740018
2002-12-17 16:59:00.000 127671.0 6.0 53314 2.3946545
2003-01-16 07:15:00.000 62206.0 71.0 24604 2.5281854
2003-01-21 07:15:00.000 8287.0 43.0 3661 2.2629712
2003-01-27 07:15:00.000 10402.0 68.0 4265 2.4389215
2003-01-31 07:15:00.000 9127.0 73.0 3784 2.4113607
2003-02-05 00:00:00.000 8362.0 327.0 3500 2.3891428
2003-02-10 00:00:00.000 8846.0 262.0 3230 2.7386997
2003-02-14 00:00:00.000 10018.0 51.0 4107 2.4386563
2003-02-20 00:00:00.000 10388.0 91.0 4686 2.2168159
2003-02-26 00:00:00.000 10571.0 69.0 4330 2.4407759
2003-03-03 00:00:00.000 10476.0 261.0 4423 2.3679929
2003-03-06 00:00:00.000 8858.0 594.0 3183 2.7829092
2003-04-02 00:00:00.000 57681.0 275.0 38622 1.4934366
2003-04-05 00:00:00.000 10539.0 29.0 8776 1.2008888
2003-04-09 00:00:00.000 9880.0 1324.0 7193 1.3735576
2003-04-12 00:00:00.000 8953.0 195.0 7737 1.1571668
2003-04-16 00:00:00.000 8385.0 177.0 7154 1.1719078
2003-04-21 00:00:00.000 8920.0 173.0 7756 1.1500773
2003-04-24 00:00:00.000 8563.0 156.0 7320 1.169649
2003-04-29 00:00:00.000 8462.0 137.0 7414 1.1412003
2003-05-02 00:00:00.000 9625.0 140.0 8363 1.1509027
2003-05-06 00:00:00.000 8208.0 904.0 6557 1.251792
2003-05-09 00:00:00.000 9211.0 119.0 7986 1.1533934
2003-05-19 00:00:00.000 19623.0 123.0 17290 1.1348679
2003-05-22 00:00:00.000 9568.0 246.0 8357 1.1449084
2003-05-28 00:00:00.000 9599.0 169.0 8553 1.1221651
2003-06-02 00:00:00.000 10937.0 174.0 9599 1.1393895
2003-07-11 00:00:00.000 99592.0 999.0 83573 1.1916767
2003-07-29 00:00:00.000 42434.0 111.0 33918 1.2510761
2003-08-21 00:00:00.000 59580.0 323.0 50756 1.1738282
2003-09-12 00:00:00.000 51779.0 1407.0 44298 1.1688789
2003-09-25 00:00:00.000 30655.0 255.0 26924 1.138533
2003-10-12 00:00:00.000 44573.0 968.0 37746 1.1808668
2003-10-28 00:00:00.000 38358.0 532.0 32689 1.1734222
2003-11-11 00:00:00.000 35158.0 145.0 28124 1.2500622
2003-12-04 00:00:00.000 61304.0 787.0 52882 1.1592383
2003-12-18 00:00:00.000 44462.0 221.0 39493 1.1257913
2004-01-06 00:00:00.000 56617.0 998.0 49471 1.1444252
2004-02-04 00:00:00.000 96694.0 537.0 83182 1.162425
2004-03-05 00:00:00.000 90850.0 716.0 78693 1.1544864
2004-03-23 00:00:00.000 48969.0 125.0 43450 1.1270195
2004-07-05 00:00:00.000 301725.0 1405.0 258824 1.1657491
2004-08-06 00:00:00.000 95079.0 1419.0 75445 1.2602259
2004-09-03 00:00:00.000 88056.0 193.0 68403 1.2873119
2004-09-23 01:30:12.997 57515.0 8.0 42891 1.3409261
2004-10-11 00:00:00.000 57204.0 116.0 40241 1.4215
2004-10-15 00:00:00.000 17702.0 186.0 12774 1.3856752
2004-10-19 00:00:00.000 9556.0 125.0 7305 1.3079661
2004-10-21 00:00:00.000 8898.0 133.0 6299 1.4126052
2004-10-25 00:00:00.000 8878.0 104.0 6372 1.3930645
2004-10-27 00:00:00.000 11904.0 252.0 6056 1.9656539
2004-10-29 00:00:00.000 8866.0 99.0 6551 1.3533812
2004-11-02 15:22:47.997 12287.0 1.0 9791 1.2547998
2004-11-05 13:16:50.997 12287.0 1.0 10013 1.2269822
2004-11-09 23:52:48.000 12284.0 4.0 9200 1.3352174
2004-11-12 17:17:59.997 12287.0 1.0 9360 1.3127136
2004-11-22 06:58:06.997 24575.0 1.0 19742 1.244745
2004-11-25 01:57:00.000 12287.0 1.0 8822 1.392768
2004-11-30 21:34:59.997 12287.0 1.0 9128 1.3459306
2004-12-03 13:21:24.000 12287.0 1.0 9085 1.3523003
2004-12-07 04:05:21.000 12285.0 5.0 9488 1.2947934
2004-12-09 13:25:00.000 12285.0 5.0 8993 1.3659106
2004-12-13 07:21:46.000 12282.0 10.0 9461 1.2981714
2004-12-15 18:41:23.000 12287.0 2.0 9112 1.3482937
2005-02-04 14:41:36.997 178768.0 58.0 133439 1.3396883
2005-02-23 00:00:00.000 51107.0 29.0 38624 1.3231586
2005-03-10 23:06:17.997 50891.0 24.0 38479 1.3225312
2005-03-28 00:00:00.000 45509.0 32.0 34203 1.3305169
2005-04-13 09:50:34.000 58778.0 19.0 43687 1.3454038
2005-06-08 09:46:43.997 162983.0 25.0 121508 1.3413246
2005-08-08 09:37:29.000 197467.0 20.0 143462 1.3764411
2005-08-24 11:21:37.997 57393.0 5.0 42770 1.3418672
2005-09-11 13:54:05.997 53729.0 5.0 39527 1.3592987
2005-11-08 00:00:00.000 193537.0 69.0 136906 1.4136385
2005-11-22 00:00:00.000 55031.0 33.0 38197 1.4407152
2005-12-05 00:00:00.000 40371.0 77.0 28082 1.4376112
2005-12-22 12:40:59.997 75170.0 3.0 52523 1.4311825
2006-03-02 00:00:00.000 239709.0 42.0 170405 1.4066935
2006-03-04 06:26:36.997 9639.0 23.0 6470 1.489799
2006-03-12 10:02:43.000 21993.0 1.0 16086 1.3672137
2006-03-15 00:00:00.000 8774.0 40.0 6687 1.3119019
2006-04-03 00:00:00.000 69570.0 31.0 46495 1.4962578
2006-04-04 00:00:00.000 8743.0 28.0 4606 1.8977643
2006-04-04 13:53:00.997 12284.0 6.0 3401 3.6108172
2006-04-05 00:00:00.000 10794.0 29.0 3438 3.139616
2006-04-06 00:00:00.000 9413.0 45.0 5001 1.8818473
2006-04-10 00:00:00.000 11058.0 30.0 7865 1.4059758
2006-04-14 00:00:00.000 23183.0 38.0 16281 1.4238423
2006-04-18 00:00:00.000 9898.0 37.0 7258 1.3635488
2006-04-21 03:19:31.000 16561.0 26.0 11848 1.3976707
2006-04-25 14:48:00.000 12287.0 3.0 8553 1.436572
2006-04-27 13:37:49.000 9793.0 96.0 7203 1.3593837
2006-05-02 00:00:00.000 11426.0 30.0 8135 1.4043757
2006-05-04 05:28:36.000 12277.0 22.0 8806 1.3940048
2006-06-08 00:00:00.000 123695.0 33.0 89478 1.3824068
2006-06-16 00:00:00.000 35327.0 37.0 24539 1.4396267
2006-06-29 00:00:00.000 48433.0 40.0 35226 1.3748829
2006-07-14 00:00:00.000 62915.0 57.0 44859 1.4024744
2006-08-10 00:00:00.000 106281.0 36.0 75810 1.401939
2006-08-17 00:00:00.000 25345.0 81.0 18123 1.398422
2006-08-28 00:00:00.000 40947.0 38.0 27573 1.4850397
2006-09-11 09:00:00.000 52187.0 15913.0 36698 1.4220666
2006-09-25 00:00:00.000 52902.0 30.0 37210 1.4216764
2006-10-06 00:00:00.000 54534.0 31.0 38244 1.4259119
2006-10-11 13:29:40.997 16380.0 5.0 12503 1.3100855
2006-11-29 00:00:00.000 197522.0 27.0 138746 1.423623
2006-12-01 00:00:00.000 10584.0 24.0 7602 1.3920821
2007-01-02 00:00:00.000 141284.0 34.0 101246 1.3954526
2007-01-12 02:57:03.997 60416.0 23.0 41700 1.4488249
2007-02-13 00:00:00.000 156270.0 75.0 109875 1.4222525
2007-02-16 00:00:00.000 17770.0 38.0 12325 1.441668
2007-03-05 12:23:00.000 73763.0 3.0 51503 1.43218
2007-03-08 04:11:49.997 16407.0 22.0 11428 1.4355587
2007-03-26 09:10:43.000 76336.0 20.0 53687 1.4218712
2007-04-05 12:31:28.000 64126.0 24.0 40172 1.5962859
2007-04-07 01:11:22.000 9244.0 28.0 6657 1.388405
2007-04-10 00:00:00.000 8924.0 38.0 6140 1.4531835
2007-04-24 21:01:00.000 73487.0 6.0 51689 1.421687
2007-04-26 09:01:48.997 9584.0 25.0 6650 1.441203
2007-04-28 04:09:21.000 9801.0 27.0 7037 1.3925831
2007-05-01 12:55:00.000 8781.0 26.0 6012 1.460336
2007-05-03 00:00:00.000 10570.0 53.0 7298 1.4481436
2007-05-04 21:49:27.000 12287.0 1.0 8680 1.415553
2007-05-08 06:06:45.997 8202.0 27.0 5511 1.4880261
2007-05-10 00:00:00.000 10920.0 49.0 7973 1.3696225
2007-05-12 00:44:10.000 11375.0 27.0 8223 1.3833151
2007-05-15 10:51:50.000 9453.0 27.0 6516 1.4507366
2007-05-18 08:44:36.997 17930.0 27.0 12651 1.4172792
2007-05-22 00:00:00.000 10089.0 74.0 7260 1.3894781
2007-05-23 21:07:38.000 12286.0 3.0 8604 1.4279405
2007-05-26 03:46:02.000 12287.0 6.0 8545 1.4377487
2007-05-30 21:24:29.997 12287.0 1.0 8663 1.4183308
2007-06-01 18:37:16.000 12287.0 1.0 8401 1.4623899
2007-06-05 00:00:00.000 9255.0 52.0 6491 1.4256008
2007-06-08 22:18:40.000 24574.0 3.0 17047 1.4415439
2007-06-12 09:42:14.997 9550.0 31.0 6410 1.4896272
9200-12-08 09:49:59.997 64286.0 1.0 45408 1.4157417
(150 row(s) affected)
What can I do to get SQL to use this index?
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Aug 20, 2007
Hello All,
I have a series of Stored Procedure that has a query taking a join of 5 tables. These tables are quiet large with couple of them having around 10 million rows. As this is a DSS application having periodic data loads, I thought of creating Indexed View on top of these tables. Now the problem is that the Indexed View is not directly used by the optimizer. I need to change my queries and put a WITH (NOEXPAND) query hint to make sure the indexed views are used. This is inspite getting dramatic improvement in the query timings (from 64 secs down to 3 secs) after using the Indexed Views. I would like to know what can be the possible reason for the optimizer not using the Indexed View by itself. Is it because my Indexed View caters to multiple queries or I am missing out on something basic.
Thanks in Advance,
Mitesh Shah
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Jul 9, 2007
Hi,I want to access the real execution plan via my webapplication after I have executed an SQL statement. I know how to get the estimated execution plan:1 cmd.CommandText = "SET SHOWPLAN_XML ON";2 cmd.ExecuteNonQuery();3 4 cmd.CommandText = myStatement;5 SqlDataReader dataReader = cmd.ExecuteReader();6 7 String plan = String.Empty;8 9 while (dataReader.Read()) {10 plan += dataReader.GetSqlString(0).ToString();11 }12 13 cmd.CommandText = "SET SHOWPLAN_XML OFF";14 cmd.ExecuteNonQuery();I want do compare the estimated costs with the real costs of the same statement. If I change code line 1 an 13 to "SET STATISTICS XML [ON|OFF]" the string "plan" will contain the result of the submitted SELECT statement, but I just need to get the plan and not the result itself. Thanks in Advance,Dominik
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