Index Tuning
Apr 22, 2008
Hi,
Our reporting tool dynamically creates tables and fields based upon Excel spreadsheets that are imported. To improve query performance, we are attempting to create indices on these tables automatically. The problem we are facing is that the tool allows the user to group the data by a whole range of fields when generating reports, therefore making it hard to decide what indices to create.
So, as an example, we have a table that has 10 VARCHAR(250) fields (the default size for text based fields in the tool), each of which could potentially be in the group by clause, and 15 numeric fields on which calculations will be carried out.
Is there a single index that we can create dynamically that would improve performance for all potential queries that may be generated? Such as an index that contains all the 10 VARCHAR(250) fields, and the numeric values as Included Columns?
If so, what effect does the order of the fields in the index have, ie we have some fields that have a lot of distinct values and some that have only a few. Which ones should appear higher in the list?
Any help would be greatly appreciated.
James
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Jun 7, 2001
I want to use the Index tuning wizard on some of my tables. Is it OK if I use when people are on the server or to do it during off-pick period. Thanks!!!
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Nov 29, 1999
Other than the SQL Server 7.0 Index Tuner wizard (which isn't suggesting anything). Is there a 3rd party Index Tuner piece of software out there? Or is there something special that needs ot be done to get the SQL Index Tuner to work?
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Jul 26, 2007
for what purpose we are splitting the non-clustered index into 3 instead of 1
create index si_acct_info_dtl_INDX1 on si_acct_info_dtl(account_code, ctrl_acct_type)
create index si_doc_hdrfk_ci_acct_info_dtl on si_acct_info_dtl(tran_ou, tran_type, tran_no)
whether index rebuit everycolumn when search is given????.if we build the index in one
statement like this:create index si_acct on si_acct_info_dtl(batch_id)
create index si_acct_info_dtl_guid on si_acct_info_dtl(batch_id,account_code, ctrl_acct_type,tran_ou, tran_type, tran_no)
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Jul 28, 2000
Eveytime I feed a query into the Index Tuner
I get the usefull message Error analyzing query (60)
What is it and how do I get round it
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May 2, 2003
Is it possible to achieve Index tuning using sql script within Query Analyser when being just a db_owner and not sysadmin.
In case the answer is yes, would you please provide any link to help or examples.
Thanks
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Mar 31, 2006
Hi,
I wanted to use the Index Tuning Wizard to monitor the performance of a stored procedure but the option is greyed out. Is there a way to turn this functionality on, or does this indicate that this option is not installed ?
Thanks,
Jeff
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Apr 17, 2007
hi all,
jusr read about index tuning wizard in BOL.. not sure about it enuff.. can anybody explain in what scenario we should use this wizard/
~~~Focus on problem, not solution~~~
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Oct 22, 2007
I'm using the Database Engine Tuning Advisor to do some performance evaluation on my database. I have one particular table that will potentially have a couple million rows. but this may not occur for a few months to a year from now.
when i run the advisor with 1.5 million rows, it recommends that i add an index across all columns in this table (covering index) for an estimated 91% improvement. when i run it with 1500 rows in it, it recommends that i add an index on 2 key columns for an 8% improvement.
how should i reconcile this? can i have both and what does that do to performance?
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Jul 20, 2005
HiI tried running ITW against one of our databases, and it came up with anumber of suggestions, but also filled the Application Log with messageslike:-The description for Event ID ( 4 ) in Source ( ITW ) could not be found. Itcontains the following insertion string(s):Error in Parsing Event:declare @P1 nvarchar(1)declare @P2 nvarchar(1)declare @P3 nvarchar(1)declare @P4 nvarchar(1)EXEC "dbo"."sp_get_RAO_indexW2K2" @P1 , @P2 , @P3 , @P4 .Does anyone know if this is serious (or indeed what it means at all)?There were no apparent errors in the ITW run.Chloe Crowder
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Nov 1, 2007
Hi All!
I would like to try and increase the performance of the reportserver database. Im thinking of adding an index to dbo.catalog.itemID - before I break the database and subsequently kill the 200+ reports i spent ages writing, does anyone know of any problems doing this?
The reports seem to be a bit slow first run but speed up during the course of the day - the server generates about 1500 instances of reports each day (7 instances of reportmanager all pointing to the reportserver db). I primarily use precompiled storedprocedures to feed the datasets so this is why im thinking index tuning may help.
Any thoughts/comments are welcomed!
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May 15, 2000
HI
I have this complex logical model with 60 tables which i have converted to phycical model and into sql 7.0 database now the database is completely new for a new internet project without even single row of data now i have to optimise database and determine if the indexes created by the the designing team are good in sql 7.0 will the give me optimised database or not . I just dont know what to do
1) is it possible for me to use indextuning wizard without the data
whenever i try to to use indextuning wizard it askes me to use a workload file or make workloas file useing a trace as i do not have the data i just have to capture a trace by saying select * from <table>
as the work load file does not return any records the index tuning wizard does not suggest any changes In the indexing
tell me HOW DO I DETERMINE WHAT INDEXES TO CREATE FOR A OPTIMISED DATABESE ?
2) IT IS NOT POSSIBLE FOR ME TO PUT DATA IN ANY ONE TABLE AS ALL THE TABLES HAVE fk AND pk RELATION SHIP so what do i do
3) WHAT DOES dba normally do when he recives an empty data base to optimise
4) where do i make views to optimise the data
5) how do I populate data in so many tables
will puting dummy data help ?
Can some one help me with some SP which will populate the table with dummy data by some kind of do while loop with counter incrementing with 1000 rows
please help me
and if i am not clear
pl tell ask me the questions on my default email or
johnusa44@hotmail.com
john or G2
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Aug 16, 1999
I've tried many times to get the index tuning wizard to work...It never seems to find any 'parseable queries' in my workload file. I believe that I'm running the profiler correctly.
When I submit a simple sql file as a workload file, I get a 'server error creating table or index analysis...' back.
Any suggestions or hints?
Thanks,
Steve
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Jan 14, 1999
I am running a Desktop SQL 7.0 database on Windows 95. I produced a trace file using the Profiler and am trying to run the Index Tuning Wizard on the trace file. I always get an error message "Error analyzing workload (60).". I cannot find anything in Books Online or the Microsoft web site.
Thanks for any help.
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May 9, 2006
Hi
When I try to run the ITW to increase performance I get this error in the event viewer. Earlier I have used the ITW with success but now I dont get any more index recommendations, just this error. Do you know what it means :
"The description for Event ID ( 4 ) in Source ( ITW ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event:
Error in Parsing Event:
execute sp_Sys'.
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Jul 20, 2005
Hi,I am having problems getting anything useful out of the index tuningwizard.I have created a table and inserted data into it. When i run the indextuning wizard i expect 2 indexes to be recommended so the book says(Index011 with a key on the uniqueid column and a non clustered indexnamed table02 with a key on the col03 and LongCol02)Instead i get nothing being recommended.What am i doing wrong????Please helpMaryamif exists (select name from dbo.sysobjects where name ='table01' andtype ='u')drop table table01create table table01(uniqueid int identity, longcol02 char(300)DEFAULT 'THIS IS THE DEfault column',col03 char(1))godeclare @counter intset @counter =1while @counter<=1000begininsert table01 (col03) values('a')insert table01 (col03) values('b')insert table01 (col03) values('c')insert table01 (col03) values('d')insert table01 (col03) values('e')insert table01 (col03) values('f')set @counter=@counter+1end
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Apr 11, 2007
hello,
I'm looking for a way to populate my index on insertion but not on updates.
I tried each possible value for CHANGE_TRACKING MANUAL|AUTO|OFF and it automatically takes every changes that have been made before in account. is there a way to "flag" the rows that I don't want the server to re-index (i.e. updated rows).
Thanks for reading, any help is welcome.
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Jan 8, 2006
I saw this tool for SQL-Server 2000 :
http://www.sql-server-performance.com/index_tuning_wizard_tips.asp
Is there anything similar for SQL-Server 2005 Express ?
Thank you very much for any help!
Regards,
Fabian
my favorit hoster is ASPnix : www.aspnix.com !
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Nov 14, 2007
Hello all.
I have the following table
Create Table Item(
I_AssetCode NVarChar(40) Primary Key NOT NULL,
I_Name NVarChar(160),
I_BC nvarchar(20),
I_Company nvarchar(20)
);
Create Index ind_Item_Name on Item(I_Name);
Create Index ind_Item_BC on Item(I_BC);
Create Index ind_Item_Company on Item(I_Company);
It is populated with 50 000 records.
Searching on indexed columns is fast, but I've run into the following problem:
I need to get all distinct companies in the table.
I've tried with these two queries, but they both are very slow!
1. "select I_Company from item group by I_Company " - This one takes 19 seconds
2. "select distinct(I_Company) from item" -This one takes 29 secons
When I ran them through the SQL Management Studio and checked the performance plan, I saw that the second one doesn't use index at all ! So I focused on the first...
The first one used index (it took it 15% of the time), but then it ran the "stream aggregate" which took 85% of the time !
Actully 15% of 19 seconds - about 2 seconds is pretty much enough for me. But it looks that aggregate function is run for nothing!
So is it possible to force the query engine of the SSCE not to run it, since there is actually no aggregate functions in my select clause?
According to SQL CE Books online:
Group By
"Specifies the groups (equivalence classes) that output rows are to be placed in. If aggregate functions are included in the SELECT clause <select list>, the GROUP BY clause calculates a summary value for each group."
It seems the aggregate is run every time, not only when there is an aggregate function.
Is this a bug?
Thanks in advance,
TipoMan
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Nov 22, 2000
Hi
Is there any good books for Query Tuning and Stored procedure Tuning
Thanks
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Oct 20, 2006
please explain the differences btween this logical & phisicall operations that we can see therir graphical icons in execution plan tab in Management Studio
thank you in advance
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Sep 30, 2015
I am using Full Text Index to index emails stored in BLOB column in a table. Index process parses stored emails, and, if there is one or more files attached to the email these documents get indexed too. In result when I'm querying the full text index for a word or phrase I am getting reference to the email containing the word of phrase if interest if the word was used in the email body OR if it was used in any document attached to the email.
How to distinguish in a Full Text query that the result came from an embedded document rather than from "main" document? Or if that's not possible how to disable indexing of embedded documents?
My goal is either to give a user an option if he or she wants to search emails (email bodies only) OR emails AND documents attached to them, or at least clearly indicate in the returned result the real source where the word or phrase has been found.
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Feb 21, 2005
Hey,
SQL Server 7.
I have a view which joins 3 tables. One has 15 million rows the next another 5 million and the third 500k.
When I join them the execution plan tells me that 15 million rows were retrieved from the first (taking about 5 mins) 1.5 million from the 2nd taking 3 mins and 4.5 million from the third taking almost no time.
The first two ause a clustered index, one being a seek the other a scan and the third a regular index seek. All followed by a hash match/inner join which takes 2 mins.
Any ideas on optimizing the SQL?
Here is the syntax:
SELECT b.packno, b.COMM_DATE, a.ben_grp_cr, a.ben_dsc_cr, c.gst_inc,
SUM(a.credit)
FROM TABC c INNER JOIN TABB B
ON b.PACKNO = c.PACKNO AND
b.COMM_DATE = BENDTL.COMM_DATE AND
b.BEN_NUM = c.BEN_NUM INNER JOIN
TABA a ON b.tran_id = a.tran_id
WHERE b.tran_date > '20040401' AND c.gst_inc = 0
GROUP BY b.packno, b.COMM_DATE, a.ben_grp_cr, a.ben_dsc_cr,
c.bendtl.gst_inc
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Jun 27, 2006
I tried on finding out the problem in a slow running sp with profiler. I found that there are some waiting resource 'tracewrite' and 'async_network_io'. Any idea on it? Thanks in advance
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Dec 5, 2007
Dear All.
We had Teradata 4700 SMP. We have moved data from TD to MS_SQL SERVER 2003. records are 19.65 Millions.
table is >> Order_Dtl
Columns are:-
Client_ID varchar 10
Order_ID varchar 50
Order_Sub_ID decimal
.....
...
..
.
Pk is (ClientID+OrderId+OrderSubID)
Web Base application or PDA devices use to initiate the order from all over the country. The issue is this table is not Partioned but good HP with 30 GB RAM is installed. this is main table that receive 18,0000 hits or more. All brokers and users are using this table to see the status of their order.
The always search by OrderID, or ClientID or order_SubNo, or enter any two like (Client_ID+Order_Sub_ID) or any combination.
Query takes to much time when ever server receive more querys. some orther indexes are also created on the same table like (OrderDate, OrdCreate Date and Status)
My Question are:-
Q1. IF Person "A" query to DB on Client_ID, then what Index will use ? (If any one do Query on any two combination like Client_ID+Order_ID, So what index will be uesd.? How does MS-SQL SERVER deal with these kind of issues.?
Q2. If i create 3 more indexes on ClientID, ORderID and OrdersubID. will this improve the performance of query.if person "A" search record on orderNo so what index will be used. (Mind it their would be 3 seprate indexes for Each PK columns) and composite-Clustered index is also available.?
Q3. I want to check what indexes has been used? on what search?
Q4. How can i check what table was populated when, or last date of update (DML)?
My Limitation is i Dont Create a Partioned table. I dont have permission to do it.
In Teradata we had more than 4 tb record of CRM data with no issue. i am not new baby in db line but not expert in sql server 2003.
I am thank u to all who read or reply.
Arshad
Manager Database
Esoulconsultancy.com
(Teradata Master)
10g OCP
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Oct 28, 2015
My SSIS package is running very slow taking so much time to execute, One task is taking 2hr for inserting 100k records, i have disabled unused index still it is taking time.I am rebuilding/Refreshing indexes and stats once in month if i try to execute on daily basis will it improve my SSIS Package performance?
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Jan 22, 2006
Keep getting this error when positioning to the last page of a report.
Using Server 2003...SqlRpt Svcs 2000 sp2
Detail error msg:
Exception of type Microsoft.ReportingServices.ReportRendering.ReportRenderingException was thrown. (rrRenderingError) Get Online Help
Exception of type Microsoft.ReportingServices.ReportRendering.ReportRenderingException was thrown.
Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index
Anyone have any suggestions? Any way to find out what collection is blowing?...or where parameter name: index comes from?
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Jun 20, 2008
hello friends
i have table1 and 200 coulumn of table1 :) i have 647.600 records. i entered my records to table1 with for step to code lines in one day :)
i select category1 category2 and category3 with select code but i have just one index.. it is productnumber and it is primarykey..So my select code lines is so slow.. it is 7-9 second.. how can i select in 0.1 second ? Should i create index for category1 and category2 and category3 ? But i dont know create index.. My select code lines is below.. Could you learn me and show me index for it ?? or Could you learn me and show me fast Select code lines and index or etc ??? Also my search code line have a dangerous releated to attaching table1 with hackers :)
cheersi send 3 value of treview1 node and childnode and child.childnode to below page.aspx :)
Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
If Not Me.IsPostBack Then
If Request("TextBox1") IsNot Nothing ThenTextBox1.Text = Request("TextBox1")
End If
If Request("TextBox2") IsNot Nothing ThenTextBox2.Text = Request("TextBox2")
End If
If Request("TextBox3") IsNot Nothing ThenTextBox3.Text = Request("TextBox3")
End If
End If
Dim searchword As String
If Request("TextBox3") = "" And Request("TextBox2") = "" Then
searchword = "Select * from urunlistesi where kategori= '" & Request("TextBox1") & "'"
End If
If Request("TextBox3") = "" Then
searchword = "Select * from urunlistesi where kategori= '" & Request("TextBox1") & "' and kategori1= '" & Request("TextBox2") & "'"
End If
If Request("TextBox3") <> "" And Request("TextBox2") <> "" And Request("TextBox1") <> "" Then
searchword = "Select * from urunlistesi where kategori= '" & Request("TextBox1") & "' and kategori1= '" & Request("TextBox2") & "' and kategori2= '" & Request("TextBox3") & "'"
End If
SqlDataSource1.SelectCommand = searchword
End Sub
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Jul 9, 2004
Hi,
I'm running a merge replication on a sql2k machine to 6 sql2k subscribers.
Since a few day's only one of the merge agents fail's with the following error:
The merge process could not retrieve generation information at the 'Subscriber'.
The index entry for row ID was not found in index ID 3, of table 357576312, in database 'PBB006'.
All DBCC CHECKDB command's return 0 errors :confused:
I'm not sure if the table that's referred to in the message is on the distribution side or the subscribers side? A select * from sysobjects where id=357576312 gives different results on both sides . .
Any ideas as to what is causing this error?
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Jul 3, 2006
Hi everyone,
When we create a clustered index firstly, and then is it advantageous to create another index which is nonclustered ??
In my opinion, yes it is. Because, since we use clustered index first, our rows are sorted and so while using nonclustered index on this data file, finding adress of the record on this sorted data is really easier than finding adress of the record on unsorted data, is not it ??
Thanks
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Jan 15, 2002
I need to find a way to make this query run faster. Please let me know if you can help. Here are some of the issues.
1) I have a database with one table, and No indexes can be put in place.
2) This is a very large database. (4,000,000) records, and growing daily.
3) the following query returns 720,000 records.
4) The query takes about 18 minutes to complete.
I understand that by doing a table scan, the way this has to run is difficult, but is there anything I can do?
The Problem: When I run this query, I also run performance monitor, I have found that my page file is at 100%. I have 1 Gig of Ram on the server with 2 P III Xeion Processors. I don't know what other information I can give, but please let me know.
Thanks for you assistance
Troy
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Jul 9, 2001
Hey all,
I am interested in finding out if anyone out there has experience with extremely high-performance SQL Server applications. The I/O needs of my database server are growing very quickly, and I am on the verge of launching a major upgrade project.
We have done all the standard tuning tasks: proper indexing, stored procedure tuning, etc... and are running on good small-server scale hardware ( dual PIII 700s, 1G RAM, but no RAID). The only path I can see to achieving higher performance are:
- lots of RAID, perhaps on a SAN.
- server upgrade, maybe 4 proc? I've been looking at RAIDZONEs and Netfinity's
- data partitioning ( I REALLY want to avoid this if I can! )
What do you do when you need Major Enterprise scale database performance from SQL Server? I've found lots of resources for Oracle and DB2, but I can't find many case studies for serious SQL Server installations.
Help!
-Dave
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Jul 18, 2000
Hi,
does the upgradition SQL Server 6.5 to 7.0 will simply solve some problems which we are facing currently like ODBC errors Insert failed and update failed and also supporting more users ?
We have Access front end to SQL Server backend, so do we need to touch code in front end for optimizations ?
Can any pls guide me on this
Thanks
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