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
1
vote
1 answer

Minimum row count to create Non-clustered index in Sql server

Just wondering, what is the minimum number of records should present in the database such that non-clustered index will give advantage on simple SQL query. I have a table with 100K records and my query is simple as below. SELECT a, b, c, …
Dipen Dedania
  • 1,452
  • 1
  • 21
  • 37
1
vote
4 answers

tsql query and index question

I have a table that stores photo information with id as Primary key: id(PK), title, album_id, posted_by, published, filename, tags, ratings, date_posted This table will hold infor of 100+ Million photos and I need to run this query like these…
kheya
  • 7,546
  • 20
  • 77
  • 109
1
vote
2 answers

Using non clustered index for efficient searching

I have created non clustered index on combination of three columns. Do I need to specify all the three columns in where condition to used non clustered index.
gkarya42
  • 429
  • 6
  • 22
1
vote
0 answers

Always coming Column Stored index scan instead of Seek

I have created a column stored index(Clustered/Non-Clustered) on a table. But when i use that table in my query always Column Store Index scan is coming in the Execution Plan. Why Column-Store Index seek is not coming ?
Sreepathi
  • 93
  • 13
1
vote
3 answers

Which non-clustered index should I use?

Here I am studying nonclustered indexes on SQL Server Management Studio. I've created a table with more than 1 million records. This table has a primary key. CREATE TABLE [dbo].[Customers]( [CustomerId] [int] IDENTITY(1,1) NOT NULL, …
Junior Mayhé
  • 16,144
  • 26
  • 115
  • 161
1
vote
1 answer

How does Non-Clustered index work when it has a lot of keys with the same value

Suppose that I have a heap table with columns (id, name, gender, age) If I have a NonClustered index in a column "name", what happens if I have like 10 people named "Lucas"? Does the index know which one "Lucas" he is point to? If there are so many…
Mucida
  • 603
  • 9
  • 24
1
vote
1 answer

Why my SQL query is reading more pages but is faster?

I was testing some nonClustered indexes to be added in a table inside a view (that has 7 inner joins). After running Tunning Advisor (SQL Server 2008) it showed me a script to create a nonClsutered index in a table (a) that could help me to optimize…
Mucida
  • 603
  • 9
  • 24
1
vote
2 answers

How do I address an issue with an overly wide index?

I am not very proficient at SQL yet. I'm learning, but it's a slow process. I am working on a project at work which stores a good deal of information in a database in SQL Server. In one of the tables, ContactInformation, we're experiencing an error…
Sean Duggan
  • 1,105
  • 2
  • 18
  • 48
1
vote
2 answers

Clustered index vs. Non-clustered index including ALL columns (SQL Server)

A brief overview of the scenario: My database uses GUID's as primary keys, and, for what I've been reading, it seems like it's somewhat bad to have clustered indexes on GUID's (increases fragmentation, slows down inserts etc.). My project uses…
Diego Martins
  • 89
  • 1
  • 7
1
vote
1 answer

Do rowversion/timestamp columns in SQL Server need a nonclustered index when using EF code-first?

All of my tables have a rowversion column that EF uses for optimistic concurrency checking. Should I create a nonclustered index on this column for faster data retrieval? Each table also has a clustered primary key named Id. Whenever updating data,…
Mark13426
  • 2,569
  • 6
  • 41
  • 75
1
vote
2 answers

SQL Server Non Clustered Indexes with multiple columns

I cannot seem to find a straight answer. I have the following columns: ZipCode StateAbbreviation CountyName I will be querying the table by either ZipCode alone or StateAbbreviation/CountyName combination. I have a PK Id column defined, so this is…
obautista
  • 3,517
  • 13
  • 48
  • 83
1
vote
2 answers

Reads are not getting low after putting a Index

The requirement is to load 50 records in paging with all 65 columns of table "empl" with minimum IO. There are 280000+ records in table. There is only one clustered index over the PK. Pagination query is as following: WITH result_set AS ( …
Prakash
  • 741
  • 1
  • 7
  • 11
1
vote
2 answers

Clustered and non-clustered index

Is it possible to create a non clustered index which is not unique? What data structure is used to implement non clustered indexes.
java_geek
  • 17,585
  • 30
  • 91
  • 113
1
vote
1 answer

Size of a single key in an index

I have built a non-clusterd index over a few fields. How now do I view the size of each key in my index, or is this simply the sum of the field byte sizes I have used in my index? Thanks Thomas
friartuck
  • 2,954
  • 4
  • 33
  • 67
1
vote
1 answer

Does INCLUDing Columns to Non-Clustered Index DUPLICATE values?

If I use INCLUDE clause and add some columns to a Non-Clustered Index, does this mean I am storing the data both on INDEX and on its PAGE -meaning at least DOUBLING the space consumed-?
pencilCake
  • 51,323
  • 85
  • 226
  • 363
1 2 3
…
15 16