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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.

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How to correctly use non-clustered index to speed up querying in stored procedure

I'm preparing a stored procedure to join tables and filter out useful rows. To help the querying, I create an non-clustered index on two columns of table A and then drop it in this sp. It works very well. Since multiple users can call this sp, this…
Harry
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Clustering key goes up to tree with non-clustered index in SQL Server

It seems in SQL Server before version 2019, the clustering key/keys goes up to tree structure with not unique non-clustered index. With bigger and multiple clustering key/keys, you gain much more wider and taller tree that costs you more storage…
ali tekrar
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No indexing in SQL tables (neither clustered nor non-clustered)

There is a stored procedure which has gets data from table tbl_SPP and makes joins with necessary tables. The table tbl_SPP has 27 million rows. It has 4 non-clustered indexes. I have to improve the performance of the query. The cost of the query…
udhaya sankar
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Execution plan gives hint for different Indexes every time

SQL Server keeps on changing option to build Non clustered Index on a table. 1st time, SQL Server gave warning to build a index on 18 columns to improve performance by 55%. I build those indexes and then the SQL ran for 16 minute At the end of…
SQL Analyst
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Should I Create Index before or after Inserting Large Volume of Data?

Before posting my post, I have read a lot of such articles and posts, such…
alancc
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Sql Server 2012 not Using Index

I have a table with several columns. I am searching for username based on first or last name. When I run the query and check the execution plan, I notice that the index is not being used. What do I need to do for SQL Server to use these…
Josiane Ferice
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SQL Server Indexing -- Any benefits of creating a nonclustered index on composite key fields?

I have a PK on two fields on my table (UtilityId, int & ACCT_NO varchar(100)) I really don't know if the order makes a difference, but this is the code (with UtilityId first): ALTER table AccountAddress ADD CONSTRAINT [PK_AccountAddresses] PRIMARY…
Kam Mistry
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Index is not used if the Query is executed after another one

I am testing the benefits of clustered and unclustered indexes for a training purpose I noted from the execution plan that if a query is executed after another one, the index (clustered or unclustered) is not used. If I put a 'GO' before the second…
Kemal AL GAZZAH
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SQL query optimization: get extra column data from non-clustered index

I am trying to write a query on a table that receives millions of records per day. I can narrow my query down to a time slice (logdate), but I need additional column data from it (num). Here is a sample query I'm using to test it: DECLARE…
Michael Foster
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Using Index scan instead of seek with lookup

I have a table with the following structure: CREATE TABLE Article ( id UNIQUEIDENTIFIER PRIMARY KEY, title VARCHAR(60), content VARCHAR(2000), datePosted DATE, srcImg VARCHAR(255), location VARCHAR(255) ); I then put a non…
Phil15
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SQL Server table only one Active Record at a given time

I have a SQL Server 2016 table where only one record should be active at any given time. There will be CRUD operations to it. I am trying to create a unique nonclustered index on that table so that it has only 1 active record at any time. Criteria…
SilverFish
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How to create clustered non-unique index on DTO property using fluent API method in EF Core 2.1?

I have a DTO, let say Vehicle and it has a manufacturer date property (DateTime Vehicle.ManufacturerDate {get; set;}. When a DTO has a primary key, I would write something like below: modelBuilder.Entity() …
hunterex
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Non clustered indexes for special case

TABLE SellerTransactions string SellerId, string ProductId, DateTime CreateDate, string BankNumber, string Name(name+' '+surname+' 'alias), string Comments, decimal Amount etc... what would be the best case scenario for search/filtering…
Greeed
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Error when trying to create non-clustered index in SQL Server

I am trying to create a non-clustered index in my SQL Server table. Upon right-clicking on the table's index folder I am getting the message: To accomplish this action set property PartitionScheme What is PartictionScheme and how am I supposed to…
nickornotto
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how to turn non-clustered Index into covering indexs

I googled covering index and found: "A covering index is a special type of composite index, where all of the columns exist in the index." I understand the main purpose is to make non-clustered index don't lookup clustered Index, and for SQL Server,…
user8033404
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