Stack Overflow
Stack Overflow

Questions tagged [non-clustered-index]

Non-Clustered Index contains pointers to the data that is stored in the data page. In Non-Clustered Index logical order doesn’t match with physical order of stored data on disk.

Non-Clustered Index contains pointers to the data that is stored in the data page. In Non-Clustered Index logical order doesn’t match with physical order of stored data on disk. Non-clustered index contains index key to the table records in the leaf level. There can be one or more Non-clustered indexes in a table.

234 questions
5
votes
3 answers

converting clustered index into non-clustered index?

Is it possible to convert a clustered index to non clustered index or non clustered index to clustered index in sql server 2005. Please convert this query into clustered index: create index index1 on mytable(firstcolumn) Please convert this query…
naveenkumar
  • 51
  • 1
  • 1
  • 2
5
votes
2 answers

How to reduce index scan by avoid scaning null values

I am using SQL Server 2008 R2 and I want to add a non-clustered index on a non-unique, nullable field. My index will also have one more column included in order to avoid accessing my clustered index: CREATE INDEX IX_My_Index ON MyTable…
zafeiris.m
  • 4,339
  • 5
  • 28
  • 41
4
votes
4 answers

SQL Server 2008 - Too much denormalization and over Indexing: What use is there for the Matrix?

I have a budding developer who is very enthusiastic about something he is calling “the matrix” I am looking for peer insight In a nutshell this is what we have: - 1 highly denormalized table with about 120 columns - Data points range from…
Jon Jaussi
  • 1,298
  • 3
  • 18
  • 36
4
votes
1 answer

Why covering index not used in the case of meeting the conditions?

A covering index is a special case of an index in InnoDB where all required fields for a query are included in the index, as mentioned in this blog https://blog.toadworld.com/2017/04/06/speed-up-your-queries-using-the-covering-index-in-mysql. But, I…
张拉拉
  • 73
  • 3
4
votes
1 answer

Does dropping of non clustered index removes existing Full Text Indexing in SQL Server table?

CREATE TABLE [dbo].[TicketTasks] ( [TicketTaskId] [int] IDENTITY(1,1) NOT FOR REPLICATION NOT NULL, [TicketTaskTypeId] [char](2) NOT NULL, [TicketId] [int] NOT NULL, [CreatedUtc] [datetime] NOT NULL, …
manu vijay
  • 367
  • 3
  • 13
4
votes
2 answers

SQL Server - Deadlock on clustered index

i have a table A with a clustered index on the primary key and a non-clustered index on a second column (act_id) (foreign Key to table B) Two update statements are generating following deadlock: Deadlock 1 This deadlock seems not to be an bookmark…
Littlefield
  • 51
  • 6
4
votes
1 answer

Clustered Index on Foreign Key VS Primary Key

Table Structure (SalesPersonProduct) SalesPersonProductId INT (PK, Clustered) SalesPersonId INT (FK - non-unique - Nullable) ProductId INT (FK - non-unique - Nullable) AreaId INT (Not Null) DistributionType …
AverageProgrammer
  • 41
  • 2
4
votes
1 answer

More than one indexes on same column in SQL server

If we create one more non-clustered index on a column which already have one in SQL server, what Would be the effect of that?
Vikant Pundir
  • 65
  • 1
  • 1
  • 5
4
votes
1 answer

Why Len Function Can Use Index?

I have a table with 145000 rows. And have not any index on it. When I run below sql. I found a table scan on execute plan as expected. It generate six rows and 3481 logic read. SET STATISTICS IO ON SELECT columnA FROM table WHERE…
jojo
  • 285
  • 4
  • 14
4
votes
2 answers

How to resolve 900 key length limit index on the column which have datatype varchar(4096) in SQL Server 2005?

This is the query for creating index create index idx_ncl_2 on BFPRODATTRASSOCIATION (value,attributeid) include (productid) Table structure of BFPRODATTRASSOCIATION ProdAttrAssociationId bigint no 8 ProductId bigint no 8 AttributeId …
Shashi
  • 12,487
  • 17
  • 65
  • 111
4
votes
2 answers

SQL Server: Create Nonclustered Index without giving a name to it

I use SQL Server 2008. I am trying to create a nonclustered index on my table. I want to check if there exists a way to create this without giving a name to the index. For e.g. CREATE TABLE #mytable (Date_ datetime NOT NULL, ID_ varchar(10) NOT…
Maddy
  • 2,520
  • 14
  • 44
  • 64
4
votes
1 answer

What is a non-clustered index scan

I know what table scan, clustered index scan and index seek is but my google skills let me down to find a precise explanation into non clustered index scans. Why and when a query uses a non clustered index scan? Thank you.
Stackoverflowuser
  • 203
  • 3
  • 12
4
votes
2 answers

Optimizing queries based on clustered and non-clustered indexes in SQL?

I have been reading lately about how clustered index and non-clustered index works. My understanding in simple terms (correct me if wrong): The data structure that backs clustered and non-clustered index is B-Tree Clustered Index: physically sorts…
brain storm
  • 30,124
  • 69
  • 225
  • 393
4
votes
1 answer

Clustered and nonclustered index - SQL Server and Oracle?

Overview of clustered and nonclustered index - not DB specific (as I understand): Clustered Index: The physical order of data. As a result, a table can only have one clustered index. Nonclustered Index: One or more nonclustered indexes can be…
user2112730
  • 51
  • 2
  • 4
4
votes
2 answers

Non-clustered index and clustered index on the same column

I came across this post in Stackoverflow. The first answer mentions something like A clustered index has all the data for the table while a non clustered index only has the column + the location of the clustered index or the row if it is on a heap…
SexyBeast
  • 7,913
  • 28
  • 108
  • 196
1
2
3
…
15 16