MS SQL Server :: Selecting Indexes

Indexes Being Improperly Used When Selecting Data Through A View

Nov 23, 2005

I am having a problem with indexes on specific tables. For some reasona query that runs against a view is not selecting the correct index ona table. I run the same query against the table directly and it looksfine. Can anyone give me some insight? Thanks.PRODUCTION1:CREATE TABLE MyTest1 (ID INT IDENTITY(1,1), COLUMN1 CHAR(10), COLUMN2CHAR(10))CREATE CLUSTERED INDEX IDX_MyTest1 ON MyTest1 ON (ID)CREATE NONCLUSTERED INDEX IDX_MyTest2 ON MyTest1 ON (COLUMN2, ID)ARCHIVE1:CREATE TABLE MyTest1 (ID INT IDENTITY(1,1), COLUMN1 CHAR(10), COLUMN2CHAR(10))CREATE CLUSTERED INDEX IDX_MyTest1 ON MyTest1 ON (ID)CREATE NONCLUSTERED INDEX IDX_MyTest2 ON MyTest1 ON (COLUMN2, ID)REPORTDB:CREATE VIEW MyTest1 ASSELECT ID, COLUMN1, COLUMN2 FROM PRODUCTION1..MyTest1UNION ALLSELECT ID, COLUMN1, COLUMN2 FROM ARCHIVE1..MyTest1While in PRODUCTION1:SELECT ID, COLUMN2 FROM MyTest1 WHERE COLUMN2 = 'Testing'--> Clustered index seek PRODUCTION1..IDX_MyTest2--> Results returnedWhile in ARCHIVE1:SELECT ID, COLUMN2 FROM MyTest1 WHERE COLUMN2 = 'Testing'--> Clustered index seek ARCHIVE1..IDX_MyTest2--> Results returnedWhile in REPORTDB:SELECT ID, COLUMN2 FROM MyTest1 WHERE COLUMN2 = 'Testing'--> Index seek PRODUCTION1..IDX_MyTest2--> Bookmark lookup PRODUCTION1..IDX_MyTest1--> Index seek ARCHIVE1..IDX_MyTest2--> Bookmark lookup ARCHIVE1..IDX_MyTest1--> Concatenate data and results returned

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Removal Of Selected Indexes / Script Index Create For List Of Indexes

Jul 1, 2014

I'm working to improve performance on a database I've inherited, and there are several thousand indexes. I've got a list of ones which should definitely exist within the database, and I'm looking to strip out all the others and start fresh, though this list is still quite large (1000 or so).

Is there a way I can remove all the indexes that are not in my list without too much trouble? I.e. without having to manually go through them all individually. The list is currently in a csv file.

I'm looking to either automate the removal of indexes not in the list, or possibly to generate the Create statements for the indexes on the list and simply remove all indexes and then run these statements.

As an aside, when trying to list all indexes in the database, I've found various scripts to do this, but found they all seem to produce differing results. What is the best script to list all indexes?

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Selecting The Most Recently Edited Item AND Selecting A Certain Type If Another Doesn't Exist

Sep 20, 2007

I've got a big problem that I'm trying to figure out:
I have an address table out-of-which I am trying to select mailing addresses for companies UNLESS a mailing address doesn't exist; then I want to select the physical addresses for that company. If I get multiple mailing or physical addresses returned I only want the most recently edited out of those.

I don't need this for an individual ID select, I need it applied to every record from the table.

My address table has some columns that look like:
[AddressID] [int]
[LocationID] [int]

[Type] [nvarchar](10)
[Address] [varchar](50)
[City] [varchar](50)
[State] [char](2)
[Zip] [varchar](5)
[AddDate] [datetime]
[EditDate] [datetime]

AddressID is a primary-key non-null column to the address table and the LocationID is a foreign key value from a seperate Companies table.
So there will be multiple addresses to one LocationID, but each address will have it's own AddressID.

How can I do this efficiently with perfomance in mind???

Thank you in advance for any and all replies...

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A Question About Clustered Indexes Forcing Rebuild Of Non-clustered Indexes.

Sep 18, 2007

So I'm reading http://www.sql-server-performance.com/tips/clustered_indexes_p2.aspx and I come across this:
When selecting a column to base your clustered index on, try to avoid columns that are frequently updated. Every time that a column used for a clustered index is modified, all of the non-clustered indexes must also be updated, creating additional overhead. [6.5, 7.0, 2000, 2005] Updated 3-5-2004
Does this mean if I have say a table called Item with a clustered index on a column in it called itemaddeddate, and several non-clustered indexes associated with that table, that if a record gets modified and it's itemaddeddate value changes, that ALL my indexes on that table will get rebuilt? Or is it referring to the table structure changing?
If so does this "pseudocode" example also cause this to occur:
sqlstring="select * from item where itemid=12345"
rs.open sqlstring, etc, etc, etc
rs.Fields("ItemName")="My New Item Name"
rs.Fields("ItemPrice")=1.00
rs.Update
Note I didn't explicitly change the value of rs.fields("ItemAddedDate")...does rs.Fields("ItemAddedDate")=rs.Fields("ItemAddedDate") occur implicitly, which would force the rebuild of all the non-clustered indexes?

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SQL Server 2008 :: Logic To Rebuild Only Clustered Indexes / Skipping To Rebuild Non Clustered Indexes In Same Table

Jun 25, 2015

I have a requirement to only rebuild the Clustered Indexes in the table ignoring the non clustered indexes as those are taken care of by the Clustered indexes.

In order to do that, I have taken the records based on the fragmentation %.

But unable to come up with a logic to only consider rebuilding the clustered indexes in the table.

create table #fragmentation
(
FragIndexId BigInt Identity(1,1),
--IDENTITY(int, 1, 1) AS FragIndexId,
DBNAME nvarchar(4000),
TableName nvarchar(4000),

[Code] ....

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Indexes Vs Clustered Indexes

Sep 17, 2006

What is the difference please?

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Selecting A View And Selecting FROM A View Is Wildly Different

Feb 21, 2006

A colleague of mine has a view that returns approx 100000 rows in about 60 seconds.

He wants to use the data returned from that view in an OLE DB Source component.

When he selects the view from the drop-down list of available tables then SSIS seems to hang without any data being returned (he waited for about 15 mins).

He then changed the OLE DB Source component to use a SQL statement and the SQL statement was: SELECT * FROM <viewname>

In this instance all the data was returned in approx 60 seconds (as expected).

This makes no sense. One would think that selecting a view from the drop-down and doing a SELECT *... from that view would be exactly the same. Evidently that isn't the case.

Can anyone explain why?

Thanks

-Jamie

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Indexes

Jul 31, 2002

Sir,

1. How do I call the indexes created in SQL server for a table from Front end VB programming ?
2. How can I use SEEK command with ADODB control ?

Please give me some tips & samples

Sundar Raman

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Indexes

Jul 23, 2001

Does anyone have the idea why the Indexes with _WA.....(like _WA_Sys_au_fname_07020F21) gets created.I don't how this index got created. I did not create this Index.
My Question is does the system creates these indexes or something else does this.
Thanks
Chak

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DB Indexes

Jul 27, 2000

Is there a way to tell how many indexes exist for an entire database, all I'm looking is for a count or generating a report list.
any help would be appreciated, thank you

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Indexes

Sep 13, 2000

At present I have been assigned to create indexes to retrieve the information fast, from the table. The existing table doesn�t have primary key, foreign key and unique constraints but I found to many default indexes already created by the system. I would like to know how this happened? Please inform how to delete these default indexes. Further, inform me other possible ways for the faster retrieval in SQL sever 7.0, if there are any.

I would appreciate if you send me a step by step explanations for the above problems.

Thanks a lot

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Indexes Not Being Used

Nov 20, 2000

I have run into a snag on my development server. Queries that are selecting data based on indexed fields in a where clause are using the wrong indexes. They are arbitrarily using the clustered index which isn't in the select at all and causing big performance problems. I can run the same statements on my production server and it runs based on the proper indexes. I used query execution plans to determine that this was infact the case.

I run DBCC Checkdb everynight and it comes back with no errors. I also rebuild the indexes. We also don't receive any other errors inputting or updating data. This sounds like corruption to me but if it's something else I don't want to spend the night restoring from production if there is another reason.

Has anyone encountered this before? Any ideas?

Appreciate it, K.

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6.5 Indexes

Jan 10, 2001

Is there any way for me to find out when last indexes have been used so that the one I don't need can be dropped.And also the one's that are of no use at all.
I need this as i am trying to dump all duplicated indexe . i know i can do this in ver 7

thanks

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Indexes

Feb 5, 2000

when executed sp_help tablename, I get lot of statistics and indexes like the following. Can anyone please tell me how it is generated automatically. as far i know statistics are generated only for primary keys. Can you please tell me what is clustered , hypothetical and the indexes starting with _WA supposed to be. Also there are lot of duplicate stats. Is it Ok to deletes those.
_WA_Sys_is_platinum_0A9D95DB
_WA_Sys_active_0A9D95DB nonclustered, statistics, auto create located on PRIMARY Active
hind_c_33_15 nonclustered, statistics located on
hind_c_37_1 clustered, hypothetical located

Thanks
Raj

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Indexes

Mar 2, 2001

Is there a way T-SQL script can find out all indexes built on a set of tables, drop them and periodically ( quarterly as an example ) re-build them ?

Thanks in advance for help.

Ivan

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Indexes

Mar 5, 2001

How do you find out indexes ( with column names info ) on a table ?

Thanks in advance.
Ivan

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Indexes!

Jun 20, 2001

I am on SQL 6.5.

I have a question about speed and indexes. I have a static table (no updates except once a year). I want to be able to search data quickly on one column or many columns. I have created nonclustered indexes on each of the columns I search by. Is there anything else I can do to speed up my queries? Unfortunately all the searches involve using the like operator. I have even broken my table down into 2 smaller tables (Table A ~ 3 million rows, Table B 8 million rows).

All suggestions will be appreciated.

Thanks,

Eric

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The Indexes

Nov 12, 1998

We have to interduce a new naming convention for the indexes currently available in the user databases.

We also have to drop all the old indexes available in about 250 tables and recreate them all acording to the naming convention we are coming up with.

Can any body suggest any idea.

I thank you guys in advance for your considaration.

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Indexes

Mar 10, 2006

hi.

there 2 different queries

1
[MYSQL].... where Cat=@CatID and Date=@Date[/MYSQL]

2
[MYSQL]... where Cat=@CatID and Date=@Date and Salesman=@SID[/MYSQL]

these queries are often used.
my question is about indexes.

should I use two different indexes?

index 1 : Cat,Date
index 2 : Cat,Date,Salesman

or only index 2 is enough ?

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SQL Indexes

Jul 11, 2006

I need to alphabetize PART of a union all query, and was told that this may be accomplished with an index. I tried joining two views, but it does not work! I have NO experience with indexes and need some help.

Here is my code:

Select id, country from countries where id = 6 union all Select id, country from countries where id <> 6

I want the country with id 6 (USA) to be the default on a drop down list, then all the other countries listed after it in alphabetical order. Can you do this with an index? If so, how do I proceed?

Thanks!

Ronna

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All Indexes In DB

Nov 15, 2004

Hi all,

I want to know all indexes in database.
What do I do to get them?

Thanks in advanced,
Thi Nguyen

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Indexes

Feb 6, 2006

We recently updated some of the databases from MS Access 2000 to SQL Server 2000. In Access we had columns which were set to Indexed No Duplicates, these were not Primary key fields. Is this possible to set some indexes to prevent duplicates in SQL Server without creating performance issues?

Miranda

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Indexes

Feb 16, 2006

Do you have to take the DB offline to create or run indexes in SQL Server 2000??

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Indexes

May 30, 2007

Q1
The table i have stores max 2000 records. Not sure if i neeed a clustered index for this few records. I guess not.

Q2
For the same table as above. How do you create primary keys if there is not unique records.
Do i create a new column? like newColumnID identity? and create a primary key on this new column? Ok even if i create this newcolumn. I don't think it will improve the retrieving speed cause i'm not selecting this column.

Opinions, ideas?

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Indexes

Aug 24, 2007

i am running a stored procedure which has got clustered indexes created after creating table and data is inserted into it after creating clustered indexes. The tables which are meant in this sp is temporary tables and how to gain the performance of a query

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Indexes

Nov 16, 2007

I've created indexes for the queries below running select getdate() before and after the query to determine the time. I'm curioius as to how sql server determines and decides how and when to use the indexes for the queries and how the run times of these queries compare. I'm also curious to know what kind of difference there would be on the last two queries as the only difference is the values.
For the last two queries I don't think there would be a difference but hoping that someone would know.

Below are my results:

select count(distinct CustomerID)
from Orders
where Status = 5

SELECT getdate()
go
Create Index Orders_Index On Orders(customerID)
go
SELECT getdate()

select sum(TotalDue)
from Orders
where CustomerID = 11212

select getdate()
go
Create Index Orders_Index On Orders(customerID)
go
select getdate()

select count(distinct AccountNumber)
from Orders
where SalesPersonID = 288

select getdate()
go
Create Index Orders_Index On Orders(salespersonID)
go
select getdate()

select count(distinct AccountNumber)
from Orders
where SalesPersonID = 276

select getdate()
go
Create Index Orders_Index On Orders(salespersonID)
go
select getdate()

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Indexes

Sep 13, 2007

where can i find a example on how tobuild a script to reindex all my tablesTksDaveP

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Should I Use Indexes?

Aug 31, 2006

I have a very large table (about 200,000 records), but there are only 2 fields in the table only one populated with data. I need to update the 2nd field with the first field's data.

UPDATE Table1
SET field2 = field1

This is taking a really long time to run about 3.5 minutes.
Is this normal? Can I create an index? What can I do to shorten the run time?

Thanks,
Ninel

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Indexes

Apr 23, 2008

Aren't all indexes created as separate structures from a table?
Although the index is created against a particular
table, doesn't the index itself exist in the database as a separate,
self-contained structure?

Which index type -- clustered or nonclustered -- logically
sorts the database of a table?

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Indexes? When Should They Be Used?

Jun 28, 2007

When do we should not use the indexes?

In Inserts? In Updates? in Deletes?

If i have a massive delete like:

delete from table1 where column1='X' (2 million rows) should i have the index enabled or not?

Whats the best option? To disable indexes on massive inserts and then rebuild or to delete and recreate?

Best Regards

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Best Use Of Indexes?

Mar 29, 2008

Hi,

I need some help in deciding for the best index design possible for my requirements.
Well basically i have 3 tables (lets call it T1, T2 and T3 ).
T1 is only used like a source...
T2 is a source and destination...
T3 is only a destination table.

Lets suppose all tables have the same columns structure.
In the first phase i insert records from T1 into T2 using lots of different queries filters like this:
WHERE Col1 = x
AND Col2 IN (A and B)
AND Col3 Between Int1 and Int2
AND Col4 = y

Other queries looks the same but diferent column is used in the Col4 place... so it can be Col5, 6 or 7 for example.

In the second phase i do the same but from T2 into T3...

Whats the best index design in this case?

Should i disable indexes in the destination table T2 while i am loading it and the rebuild? This can take alot of time, any other way? Is it best to leave it enabled all the time?

What kind of indexes should i create? Multi Column indexes or single ones for Col1, 2 3 4 5 6.. etc??

Best Regards

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Selecting NOT TOP 1

Jun 10, 2004

Hi,

I am trying to select all entries from a database apart from the top/latest entry, via a stored procedure.
Below is the code that i have but i am doing it wrong somehow.

Any ideas?

Thanks

CREATE PROCEDURE spNEWSARCHIVE AS

SELECT *
FROM tblNEWS
WHERE NewsID NOT TOP 1
ORDER BY NewsID DESC
GO

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