Transact SQL :: Dropping Clustered Index On Primary Key Which Is In Replication?

Oct 2, 2015

I am trying to drop a primary key on column LID and then create a clustered index on a new identity column ID and then add the primary key back on the LID. I am not able to do so due the table being in replication. here is the error:

Cannot alter the table '' because it is being published for replication.

How do I get past the error and create the Clustered Index on ID column in both publisher and subscriber?

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Dropping Clustered Index Associated With Primary Key.

Aug 24, 2007

Hi all,

I have a huge table with million of rows, which has ONE Clustered index associated with the PRIMARY KEY, and there are some NON_Clustered indexes.

So,now i decided that, i dont need any more indexes ( not even one) on that table, but i need to maintain primary key on that table.

(a) So, how can i accomplish this (i.e.) having primay key but not having indexes on the table.


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Dropping Primary, Clustered Key Via T-SQL

Apr 9, 2003

I'm changing the collation sequence of a field which is a primary, clustered key field via:

ALTER TABLE [dbo].[clusterAlgorithm] WITH NOCHECK ADD

Is there a way to drop the primary key designation before doing an alter table/alter column statement and then recreating the key, or must I drop and recreate the table?



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DB Engine :: How To Convert Unique Clustered Index Into Clustered Primary Key To Use With Change Tracking

Sep 4, 2015

We are going to use SQL Sever change tracking. The problem is that some of our tables, which are to be tracked, have no primary keys. There are only unique clustered indexes. The question is what is the best way to turn on change tracking for these tables in our circumstances.

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DB Design :: Script To Create Table With Primary Key Non-clustered And Clustered Index

Aug 28, 2015

I desire to have a clustered index on a column other than the Primary Key. I have a few junction tables that I may want to alter, create table, or ...

I have practiced with an example table that is not really a junction table. It is just a table I decided to use for practice. When I execute the script, it seems to do everything I expect. For instance, there are not any constraints but there are indexes. The PK is the correct column.

CREATE TABLE [dbo].[tblNotificationMgr](
[NotificationMgrKey] [int] IDENTITY(1,1) NOT NULL,
[ContactKey] [int] NOT NULL,
[EventTypeEnum] [tinyint] NOT NULL,


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Data Warehousing :: Difference Between Primary Key With Clustered And Non-clustered Index

Jul 19, 2013

I have created two tables. table one has the following fields,

                      Id -> unique clustered index.
         table two has the following fields,
                      Tid -> unique clustered index
                      Id -> foreign key of table one(id).

Now I have created primary key for the table one column 'id'. It's created as "nonclustered, unique, primary key located on PRIMARY". Primary key create clustered index default. since unique clustered index existed in table one, it has created "Nonclustered primary key".

My Question is, What is the difference between "clustered, unique, primary key" and "nonclustered, unique, primary key"? Is there any performance impact between these?

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Rda Dropping Primary Key Index

May 2, 2007

I am using RDA to download a tables

I use TrackingOffWithIndexes

the issue is that when I download a small set of data the primary key index is there

when I download a larger set. the index gets dropped (no error) just slowness when querying the table

the max database size is set to 1024mb and the temp database size is set to 1024mb

the actual db size (with the missing index) is 262 mb... lot's of room left!

when I try to create the index manually after the download in sql server management studio I get this error:

Not enough storage is available to complete this operation

I am using 2GB sd cards and nothing else is on the card.

any ideas?


eric [at] westgen com

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Primary Key Without Clustered Index

Jan 28, 2008

Dear All,
i've read one article that with some option, we can avoid creating clustered index on the primary key column. is ti possible?

how can we create a primary key without allowing sql server to create automaticaly a clustered index?

Even you learn 1%, Learn it with 100% confidence.

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Primary Key With Non-clustered Index

Dec 11, 2007

Dear all,

I want to keep certain archive data in certain tables. One such table is currently about 190 GB in size. It has a primary key with clustered index and three non-clustered indexes. The type of queries fired are strictly selects (daily) and inserts (only monthly).

Question: Is it advisable to have a non-clustered index on the primary key column?.....I am finding that the insert performance is getting hurt due to presence of clustered index on such a large table (190 GB).

Let me know your views.



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Clustered Index On Composite Primary Key

Jul 23, 2005

Is that possible on SQL Server 2000 and onwards?

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Creating A Primary Key As A Non Clustered Index

Jul 18, 2007


I have created a very simple table. Here is the script:

if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[IndexTable]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [dbo].[IndexTable]


CREATE TABLE [dbo].[IndexTable] (
[Id] [int] NOT NULL ,
[Code] [nvarchar] (50) COLLATE SQL_Latin1_General_CP1_CI_AS NOT NULL


CREATE CLUSTERED INDEX [CusteredOnCode] ON [dbo].[IndexTable]([Id]) ON [PRIMARY]


ALTER TABLE [dbo].[IndexTable] ADD

The records that i added are:

Id Code

1 a
2 b
3 aa
4 bb

Now when i query like

Select * from IndexTable

I expect the results as:

Id Code

1 a
3 aa
2 b
4 bb

as i have the clustered index on column Code.

But i m getting the results as:

Id Code

1 a
2 b
3 aa
4 bb

as per the primary key order that is a non clustered index.

Can anyone explain why it is happening?



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Update Statement Performing Table Lock Even Though Where Condition On Clustered Primary Index?

Jul 20, 2005

Hi All,I have a database that is serving a web site with reasonably hightraffiic.We're getting errors at certain points where processes are beinglocked. In particular, one of our people has suggested that an updatestatement contained within a stored procedure that uses a wherecondition that only touches on a column that has a clustered primaryindex on it will still cause a table lock.So, for example:UPDATE ORDERS SETprod = @product,val = @valWHERE ordid = @ordidIn this case ordid has a clustered primary index on it.Can anyone tell me if this would be the case, and if there's a way ofensuring that we are only doing a row lock on the record specified inthe where condition?Many, many thanks in advance!Much warmth,Murray

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Transact SQL :: Tables With FK Column Without Non-clustered Index

Oct 22, 2014

I need to find out all the tables in database, which has FK columns and don’t have any Non-clustered index on them.

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Replication :: Clustered Index Is Not Replicated

Mar 1, 2010

Using SQL 2005 SP2. I have a publication that contains indexed views, and some other objects that query the indexed view using WITH (NOEXPAND). Currently replication fails because the CLUSTERED INDEX on the view is NOT replicated. I've experimented with various schema options but nothing changes. The view is replicated but not the clustered index on that view. I've seen some discussion on replicating indexed views to a table, but I would like to replicate indexed view schema fully. (Including the clustered index on that view). Is there a way to make this work?

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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 (

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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Replication :: Non-Clustered Index Not Sync To Subscriber

Aug 7, 2015

Can I enable the Non - Clustered Index option set to 'TRUE' at publisher does it affect anything?

Does the Non clustered Indexes are automatically transfer to the subscriber database?

Does it affects database performance when I enable this option!

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SQL Server 2008 :: Change Primary Key Non-clustered To Primary Key Clustered

Feb 4, 2015

We have a table, which has one clustered index and one non clustered index(primary key). I want to drop the existing clustered index and make the primary key as clustered. Is there any easy way to do that. Will Drop_Existing support on this matter?

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Transact SQL :: Non Clustered Covered Index Not Utilizing In A Query Plan?

Jul 27, 2015

I had some SQL queries which are using department ID for join , filter , Group By and Select so , i am having index on department ID of my table File Master scheme ..



The above index only working when there is condition or group by on department ID .and i when i am querying ..


and the plan is showing Index scan on index Indx_FM_department_ID .. Why it is not using Index seek , i guess i have both group by Columns in cover index included columns what is the use of cover index then ?

because if i am giving where condition before group by for specific Client ID , Loan Sanction Date it is telling to create separate index on client ID , Loan Sanction Date as per Execution Plan missing index detail ..

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Transact SQL :: Getting List Of Clustered Column-store Index In A Database In 2014?

Sep 17, 2015

How can we get the list of clustered columnstore index in a database in sql server 2014

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Transact SQL :: Difference Between Index And Primary Key

Aug 10, 2015

What is the difference between the Index and the Primary Key?

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Data Warehousing :: Primary Key Has Both A Clustered And Non-clustered Constraint

Sep 30, 2015

I have a really super slow stored proc that does something simple. it updates a table if certain values are received.

In looking at this the matching is done on the Primary Key, which is set as a Clustered index, looking further I have another constraint, that sets the same column to a Unique, Non-Clustered.

I am not sure why this was done, but it seems to be counter productive.  I have read only references to Which one is better on a primary key, but not can their be both and if it is "Smart".

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Create Clustered Or Non-clustered Index On Large Table ( SQL Server 7 )

Jan 4, 2008

I have large table with 10million records. I would like to create clustered or non-clustered index.

What is the quick way to create? I have tried once and it took more than 10 min.

please help.

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Dropping Clustered Indexes

Sep 20, 2001

SQL 7 created by default a clustered index on my primary key field. I would like to drop this index and recreate it on another field, but it is not allowing me. Error message states: "An explicit DROP INDEX is not allowed... It is being used for PRIMARY KEY CONSTRAINT enforcement." Can anybody advise how I can solve this? TIA

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How To Alter A Non Clustered Primary Key Constraint To Clustered

Feb 26, 2008


I've a table with primary key defined as non-clusterd, now without dropping it can I modify the existing index to clustered through tsql as I had to write some migration script and in that script I wanna do this.

Thanks in Advance,


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Converting A Clustered Index On A PK Identity Field To Non-clustered

Sep 8, 2006

Hi there, I have a table that has an IDENTITY column and it is the PK of this table. By default SQL Server creates a unique clustered index on the PK, but this isn't what I wanted. I want to make a regular unique index on the column so I can make a clustered index on a different column.

If I try to uncheck the Clustered index option in EM I get a dialog that says "Cannot convert a clustered index to a nonclustered index using the DROP_EXISTING option.". If I simply try to delete the index I get the following "An explicit DROP INDEX is not allowed on index 'index name'. It is being used for PRIMARY KEY constraint enforcement.

So do I have to drop the PK constraint now? How does that affect all the tables that have FK relationships to this table?


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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!

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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.


Manager Database

(Teradata Master)
10g OCP

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Clustered And Non Clustered Index On Same Columns

Nov 1, 2007

I have a table<table1> with 804668 records primary on table1(col1,col2,col3,col4)

Have created non-clustered index on <table1>(col2,col3,col4),to solve a performance issue.(which is a join involving another table with 1.2 million records).Seems to be working great.

I want to know whether this will slow down,insert and update on the <table1>?

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DRopping Primary Key.

Dec 7, 1999

Simple heres the syntax Alter Table XX Drop PRIMARY KEY.

This is not working whats up?


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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 ??


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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
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

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Dropping Primary And Foreign Keys

Jun 22, 2001

I am having trouble dropping constraints(Primary and Foreign Keys). I would like to do so so I can truncate the tables and repopulate them. Any time I use the DROP CONSTRAINT #### on one table, I get an error message saying this is referenced in another table. Any help in how to drop the keys so I can truncate the tables in a database would be appreciated. I must be overlooking something simple. Thanks for the help.


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