Index Analysis

Aug 8, 2001

Hello,

I am tuning some queries and am using the Display Execution Plan option from Query Analyzer. What I am looking to for is somewhere which will explain the differences between the costs displayed when you put the mouse pointer over the object in the Execution plan output. BOL gives some general directions, but I need more specifics.

Any help on this would be appreciated

Thanks,

Bill

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Analysis :: Corrupted Aggregation File On Process Index?

Feb 8, 2012

I trying to update my Aggregation Design for a partition using BIDS Helper.  The current aggregation design contains about 60 aggregations and the new aggregation I am trying to add is across 5 dimension attributes, the product of which is about 500,000 unique values.  The fact table is about 13,000,000 rows.

When I deploy the aggregation and run ProcessIndex, I get the follow error:

File system error: The following file is corrupted: Physical file: ?E:Program FilesMicrosoft SQL ServerMSAS10_50.MSSQLSERVEROLAPDataTestDB.14.dbcube_2.607.cub
cubemeasuregroup_2.633.detDefaultPartition_2.579.prt852.agg.flex.data. Logical file.

If I remove the new aggregation, deploy, and run ProcessIndex again, it processes fine.

Is there some file size limitation I am running into?  The agg.flex.data file is 7.8 GB before adding the new aggregation, so it isn't subject to the same 4 GB limit as .asstore.

Windows Server 2008 64 bit

SQL Server 2008 R2 (10.50.1746.0) 64 bit

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Analysis :: SSAS Doesn't Drop Old Index Files

Oct 4, 2012

After the incremental process and full process, SSAS doesn't drop the index files #.xxx.fact.map and #.xxx.fact.map.hdr in the file.0.dim folder. We now have all the versions from 3 to 5000 sitting in the folder. The DBA team only found this when the disk is running out of space recently.

We've already check the account running the SSAS has local admin to the server.

Is there any config setting that might cause this issue? If not, what could it be causing this issue.

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Difference Between Index Seek && Index Scan && Index Lookup Operations?

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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Mar 5, 2015

I have, a SSAS 2012 tabular instance with SP2, there is a database on the instance with a read role with everyone assigned permissions. When configuring the Power BI analysis services connector, at the point where you enter Friendly Name, Description and Friendly error message, when you click next I receive the error "The remote server returned an error (403)." I've tested connecting to the database from Excel on a desktop and connect fine.I don't use a "onmicrosoft" account so don't have that problem to deal with.

We use Power BI Pro with our Office 365. As far as I can tell that part is working ok as I pass that stage of the configuration with a message saying connected to Power BI.The connector is installed on the same server as tabular services, its a Win2012 Standard server. The tabular instance is running a domain account that is the admin account for the instance (this is a dev environment) that account is what I've used in the connector configuration. It's also a local admin account. There is no gateway installed on the server.

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May 13, 2014

I have a cube that we are processing nightly via an Analysis Service Processing Task in SSIS.  In order to increase the performance of the processing time, we elected to use a lot of rigid dimension attributes, and do a full process of everything in the SSIS task.  The issue that I am having is that after that task completes, I need to go into Visual Studio to deploy the cube becuase we are unable to browse or use the cube.  This issue seemed to start once we changed the SSIS Analysis Service Processing Task to do a full process on the dimensions, rather than an incremental.

I would expect that once development is done, and it is processed and deployed, that is it.  My thinking is that the SSIS task should just update the already deployed cube,

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Jun 12, 2015

How to right choose key column in"Mining Structure" for Microsoft Analysis Services?
 
I have table:

"Incoming goods"

Create table Income (         
ID int not null identity(1, 1)            
[Date] datetime not null,             
GoodID int not null,               
PriceDeliver decimal(18, 2) not null,               
PriceSalse decimal(18, 2) not null,               
CONSTRAINT PK_ Income PRIMARY KEY CLUSTERED (ID),             
CONSTRAINT FK_IncomeGood foreign key (GoodID)  references dbo.Goods ( ID )            
)

I'm trying to build a relationship(regression) between “Price Sale” from Good and “Price Deliver”.But I do not know what column better choose as “key column”: ID or GoodID ?

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Feb 18, 2013

It is possible to create Analysis Services project (*.dwproj) in Visual Studio 2012 Data Tools?

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Analysis :: Excel 2013 Pivot-table / Grouping On Date That Comes From Analysis Service 2008?

Nov 24, 2015

I am using

SSAS: version 2008
Excel: version 2013

I am connecting to SSAS cube from Excel and I have date dimension with 4 fields (I have others but I don't use it for this case). I created 4 fields in order to test all possible scenarios that I could think of:

DateKey:
    - Type: System.Integer
    - Value: yyyyMMdd
Date:
    - Type: System.DateTime
DateStr0:
    - Type: System.String
    - Value: dd/MM/yyyy (note: I am not using US culture)
    - Example: 01/11/2015  
DateStr1:
    - Type: System.String
    - Value: %d/%M/yyyy (note: I am not using US culture) 
    - Example: 1/11/2015  

Filtering on date is working fine:

Initially, in excel, filtering on date was not working. But after changing dimensional type to time, and setting  DataType to Date, as mentioned in [URL] filter is working fine as you can see in the picture.Grouping on date is not working:

I have hierarchy in my Date dimension and I can group based on hierarchy, no problem. But user is used to pre-build grouping function of excel, and he wants to use that. Pre-build functions of Excel, Group and ungroup seems to be available as you can see in following picture:

But when user clicks 'Group', excel groups it as if it is a string, and that is the problem. User wants to group using pre-build grouping function available in Pivot table. I also find out that Power Pivot Table does not support this excel grouping functionality. And if I understood well, this pre-build grouping functionality of excel, needs to do calculation at run time, and that is not viable solution if you have millions of rows. So Power pivot table does not support pre-build grouping functionality of excel and hence we need to use dimension hierarchy to do the grouping. But I am not using Power Pivot table, I am using simple Pivot Table. So I expect grouping functionality to be working fine. Then I tried to do simple test. I created a simple data source in excel itself. And use it as source of my Pivot table. Then grouping is working fine. The only difference that I can see is (When double click the Measure value in Excel),For date values of my simple test, excel consider them as 'Date'.

For date values of my data coming from cube, excel consider them as 'General'

    2.1. But value here is same as it was in simple test.

    2.2. 'Date Filter' works just fine.

    2.3. If I just select this cell and unselect it, then excel change type to 'Date' though for that cell. 

    2.4. I have created 4 different types of fields in my date dimension thinking that values of attribute of my dimension might be the problem, but excel consider 'General' for all of them.

    2.5 This value (that can be seen when double clicking on measure) comes from 'Name Column' of the attribute. And the DataType defined is WChar. And I thought that might be the reason of issue. And I changed it to 'Date'. But SSAS does not allow it to change to 'Date' giving error : The 'Date' data type is not allowed for the 'NameColumn' property; 'WChar' should be used.

So, I don't know, what is the puzzle piece that I am missing.

1. Date filter works, group does not work

2. Excel consider it as 'General' string.

3. SSAS does not allow to change 'NameColumn' to Date.

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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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Clustered Index On Client_ID+ORderNO+OrdersubNo, If I Create 3 Noncluster Index On Said Column Will It Imporve Performance

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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Index Was Out Of Range. Must Be Non-negative And Less Than The Size Of The Collection. Parameter Name: Index

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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Index Table1 And Select For 647.600 Records.. It Is So Slow.. But I Have No Index :)???

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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The Index Entry For Row ID Was Not Found In Index ID 3, Of Table 357576312

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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Advantages Of Using Nonclustered Index After Using Clustered Index On One Table

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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SQL 2012 :: Clustered Index Key Order In NC Index

Mar 5, 2015

I have a clustered index that consists of 3 int columns in this order: DateKey, LocationKey, ItemKey (there are many other columns in this data warehouse table such as quantities, prices, etc.).

Now I want to add a non-clustered index on just one of the other columns, say LocationKey, like this:
CREATE INDEX IX_test on TableName (LocationKey)

I understand that the clustered index keys will also be added as key columns to any NC indexes. So, in this case the NC index will also get the other two columns from the clustered index added as key columns. But, in what order will they be added?

Will the resulting index keys on this new NC index effectively be:

LocationKey, DateKey, ItemKey
OR
LocationKey, ItemKey, DateKey

Do the clustering keys get added to a NC index in the same order as they are defined in the clustered index?

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Clustered Index Vs. Full Text Index

Jun 18, 2008

Quick question about the primary purpose of Full Text Index vs. Clustered Index.

The Full Text Index has the purpose of being accessible outside of the database so users can query the tables and columns it needs while being linked to other databases and tables within the SQL Server instance.
Is the Full Text Index similar to the global variable in programming where the scope lies outside of the tables and database itself?

I understand the clustered index is created for each table and most likely accessed within the user schema who have access to the database.

Is this correct?

I am kind of confused on why you would use full text index as opposed to clustered index.

Thank you
Goldmember

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Index/performance Index For SELECT.... IN Statement

Sep 10, 2007



Hi All,

I 'm working to improve some sql performance.


One of the major syntax inside the SELECT statment is ..

WHERE FIELDA IN (SELECT PARAVALUE FROM PARATABLE WHERE SESSIONID = "XXXXX" AND PARATYPE='A') AND
WHERE FIELDB IN (SELECT PARAVALUE FROM PARATABLE WHERE SESSIONID = "XXXXX" AND PARATYPE='B') AND
WHERE FIELDC IN (SELECT PARAVALUE FROM PARATABLE WHERE SESSIONID = "XXXXX" AND PARATYPE='C') AND
WHERE FIELDD IN (SELECT PARAVALUE FROM PARATABLE WHERE SESSIONID = "XXXXX" AND PARATYPE='D') AND
WHERE FIELDE IN (SELECT PARAVALUE FROM PARATABLE WHERE SESSIONID = "XXXXX" AND PARATYPE='E') AND
WHERE FIELDF IN (SELECT PARAVALUE FROM PARATABLE WHERE SESSIONID = "XXXXX" AND PARATYPE='F')

(It's to compare the field content with some user input parameter inside a parameter table... )

I think properly is that the SELECT ... IN is causing much slowness in the sql statement. I have indexed FIELDA , FIELDB, FILEDC etc and those PARAVALUE and PARATYPE in the PARATABLE table. But perfromance is still slow and execution takes >20 seconds for 200000 rows of records.

Do any one know if still any chance to improvide the performance like this?

Much Thanks,

Andy

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Index Internals - Last Time Index Was Rebuilt?

Apr 17, 2007

I'm trying to find whether there is a dmv or system view that can help me see the last time an index was rebuilt or created. Assuming I rebuilt an index using tsql commands (not a job with a history), is there a way to find out the last time that index was rebuilt?



Thanks much.

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Oct 17, 2007

Hi,

I have some questions about SQL Servers 2000 and 2005 compatibility.
In my configuration I have to use both servers.
The cubes are stocked in 2005 server.
May I transfer from 2005 to 2000 Analysis Services the cubes?

If yes, what is the procedure? The result of migration is the same in the two different versions?


If not, how can I solve this problem?

Thanks in advance.

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Index Scan Vs Index Seek

Mar 1, 2004

I have a really strange problem.

I execute this query:

declare @cid int
set @cid = 2003227

select * from sales s, product p where p.product_Id = s.product_Id and customer_id = @cid

select * from sales s, product p where p.product_Id = s.product_Id and customer_id = @cid or @cid = 0

3 Million rows in sales, 120000 in product.

The first does and index seek, the second an index scan.
The execution plan reports that the scan takes 99.87% of the cost, and the seek takes 0.13%

This problem obviously gets worse the bigger the dataset / query /etc.

The reason I query this, is because it never used to take this long to do index scans. Is there something i can change, something i can fix?

Any help would be appreciated.

Josh

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Reorganize Index And Rebuild Index ??

Mar 18, 2008

Hi,

I just want to know whether any advantage or disadvantage
in doing Reorganize Index And Rebuild Index ....

Plz do comment on this ASAP !!!!

Thanks in advance

Regards

Arv

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Reorganize Index And Rebuild Index

Mar 18, 2008

Hi,

I just want to know whether any advantage or disadvantage
in doing Reorganize Index And Rebuild Index ....

Plz do comment on this ASAP !!!!

Thanks in advance

Regards

Arv

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Clustered Index Or NonClustered Index

Apr 1, 2006

Hello I want to learn disparity clustered index or nonclustered index and in queries which one run better.

example

select * from orders where orderID=5

to this query clustered or nonclustered

thanks



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Simple Query Chooses Clustered Index Scan Instead Of Clustered Index Seek

Nov 14, 2006

the query:

SELECT a.AssetGuid, a.Name, a.LocationGuid
FROM Asset a WHERE a.AssociationGuid IN (
SELECT ada.DataAssociationGuid FROM AssociationDataAssociation ada
WHERE ada.AssociationGuid = '568B40AD-5133-4237-9F3C-F8EA9D472662')

takes 30-60 seconds to run on my machine, due to a clustered index scan on our an index on asset [about half a million rows].  For this particular association less than 50 rows are returned. 

expanding the inner select into a list of guids the query runs instantly:

SELECT a.AssetGuid, a.Name, a.LocationGuid
FROM Asset a WHERE a.AssociationGuid IN (
'0F9C1654-9FAC-45FC-9997-5EBDAD21A4B4',
'52C616C0-C4C5-45F4-B691-7FA83462CA34',
'C95A6669-D6D1-460A-BC2F-C0F6756A234D')

It runs instantly because of doing a clustered index seek [on the same index as the previous query] instead of a scan.  The index in question IX_Asset_AssociationGuid is a nonclustered index on Asset.AssociationGuid.

The tables involved:

Asset, represents an asset.  Primary key is AssetGuid, there is an index/FK on Asset.AssociationGuid.  The asset table has 28 columns or so...
Association, kind of like a place, associations exist in a tree where one association can contain any number of child associations.  Each association has a ParentAssociationGuid pointing to its parent.  Only leaf associations contain assets. 
AssociationDataAssociation, a table consisting of two columns, AssociationGuid, DataAssociationGuid.  This is a table used to quickly find leaf associations [DataAssociationGuid] beneath a particular association [AssociationGuid].  In the above case the inner select () returns 3 rows. 

I'd include .sqlplan files or screenshots, but I don't see a way to attach them. 

I understand I can specify to use the index manually [and this also runs instantly], but for such a simple query it is peculiar it is necesscary.  This is the query with the index specified manually:

SELECT a.AssetGuid, a.Name, a.LocationGuid
FROM Asset a WITH (INDEX (IX_Asset_AssociationGuid)) WHERE
a.AssociationGuid IN (
SELECT ada.DataAssociationGuid FROM AssociationDataAssociation ada
WHERE ada.AssociationGuid = '568B40AD-5133-4237-9F3C-F8EA9D472662')

To repeat/clarify my question, why might this not be doing a clustered index seek with the first query?

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Change Nc-index To C-index?

Jun 29, 2004

Found out a while back that my facts-tabel has an non-clustered index on its facts_id. In a bunch of procedures an update is executed against a facts_id unfortunately on it's facts-table. I was wondering if changing it into a clustered index is worth the effort / would make sense considering a +110 million facts and re-indexing the other indexes as well? Facts are loaded sequentially, so I would suspect them facts are in the ordered already?

thanx,

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Index Seek, Index Scan, Table Scan

Oct 4, 2007



Hey,

what is the difference between Table Scan und Index Scan?

I find no difitions in the internet

Finchen

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What Is Table Scan, Index Scan And Index Seek??

Sep 21, 2007

Hi,
I want to know wht is a


TABLE SCAN
INDEX SCAN
INDEX SEEKand When they are used, Wht is the difference between all these.????

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Include Clustered Index In Non-clustered Index?

Oct 15, 2007

Hi everybody!

I just ran the Database Engine Tuning Advisor on a relative complex query to find out if a new index might help, and in fact it found a combination that should give a performance gain of 94%. Fair enough to try that.

What I wonder about: The index I should create contains 4 columns, the last of them being the Primary Key column of the table, which is also my clustered index for the table. It is an identity integer btw.

I think I remember that ANY index does include the clustered one as lookup into the data, so having it listed to the list of columns will not help. It might at worst add another duplicate 4 bytes to each index entry.

Right? Wrong? Keep the column in the index, or remove it since it is included implicit anyway?

Thanks for suggestions!
Ralf

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IO Analysis

Mar 13, 2008

I'm looking to see if I have a issue with excessive IO activity caused by less-than-ideal access patterns.

So I've run this query to look at logical and physical reads for logical writes:

selectsql_handle, plan_handle,
total_physical_reads, last_physical_reads,
min_physical_reads, max_physical_reads,
total_logical_writes, last_logical_writes,
min_logical_writes, max_logical_writes,
total_logical_reads, last_logical_reads,
min_logical_reads, max_logical_reads
fromsys.dm_exec_query_stats

The question is, when can it be considered excessive?
Or can you just order the results by descending order and see if you can make improvements on the worst ones?

The same goes for this query for pageiolatch wait counters and times for indexes:
select database_id, object_id, index_id, partition_number, page_io_latch_wait_count, page_io_latch_wait_in_ms
from sys.dm_db_index_operational_stats (null,null,null,null)

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