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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SQL Server Clustered Index Non Unique Without primary key

I have an index on my table (SQL Server 2016 - enterprise edition). It seems it is created without a primary key (so just including all the columns). Whenever I try to show the create statement it gives me an error saying that it cannot create a…
Tjekkles
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SQL - 1 index on 2 columns or multiple indexes

Consider a sql table Employer. Column A -- (int) Unique identity column. Not used in select queries as part of the where clause. Column B -- (int) Non unique column. Used in select queries as part of the where clause very often. Which of the below…
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Multi Column index containing all columns of another index

If I have a multi-column index - containing 2 columns, and I create a 2nd index containing those 2 columns (as 1st 2 - same order) plus an additional 3rd column. Is there a need to keep the 1st index with only 2 columns?
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Choice of Clustered and Non-Clustered Index in SQL Server

I have two standalone tables Person and Bank in one database. Moreover I have a reference table Customers in another database. Table: Person - Database #1 PersonId (PK) Name _________________________________ 1 Ram 2 …
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Non-Clustered Indexes / CXPACKET Wait

Environment: SQL Server 2012 on a VM with 1 CPU and 4 cores. Experience: As a DBA--> New MAXDOP set to default of 0 I have a large table with over 100 million records and am trying to improve Query performance. I was running into large amount of…
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MYSQL multicolumn indexing

I have a query that uses a foreign key and other column(say c1) in where clause. By default, foreign key is indexed. When i add index to c1 and run explain command, the query takes up only foreign key for searching, not the c1 which is also indexed.…
User12121
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MySQL: where clustered (logical indexes) save

Non-Clustered file stored in data files, Clustered index stores data in logical index order. Where does logical order resides?
Syed Daniyal Asif
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Failed because incorrect arithabort setting

I created a unique index (case description should be unique if IsDelete != 1) CREATE UNIQUE NONCLUSTERED INDEX [UniqueCaseDescription] ON [tblCases] ([fldCaseDescription] ASC) WHERE [IsDeleted] = CAST(0 AS varbinary(1)) WITH (PAD_INDEX = OFF,…
Kate
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Clustered and non-clustered index

Interviewer asked me the difference between clustered and non-clustered index and than moved further into it and asked one more question - When a table has a clustered index and a non-clustered index, do the non-clustered index still points to the…
Learner
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unclustered PrimaryKey and clustered index

In one of our tables there is an existing non-clustered Primary Key on a UNIQUEIDENTIFIERcolumn, heavily used in FKs. We now want to add an IDENTITY column and create a unique clustered index for this. I do not need an explanation of clustered vs.…
Shnugo
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SQL server index creation vs enabling index

Have a table in sql server 2008 r2 with like 50 million records. Inserting into the table through SSIS is taking lot of time because i have five non clustered indexes on that table which I cannot remove. Thought of dropping and creating the index…
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Selecting a Function Value Shows nvarchar(4000) on an Index

I have a view that I'm trying to setup an Index for. One of the select columns for the view executes a user-defined function that has a return value of varchar(250). However, when I try to setup an Index on that column, I see a size of…
Jason N. Gaylord
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Deciding on the indexes using the query

I have a table named "Repayment" which has borrower_id as the primary key. I need to decide on the indexes that needs to created on this table. I have the following queries and I have come up with the indexes. I need to know if these indexes are…
Sindu_
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How can I provide an Index Hint to a MS-SQL Server Indexed View?

I have an indexed view FooView. I've created the following indexes against it: CREATE UNIQUE CLUSTERED INDEX IX_Foo1 ON [FooView](SomeId, AnotherId) CREATE NONCLUSTERED INDEX IX_Foo2 ON [FooView](SomeId) Is it possible to use a HINT against…
Pure.Krome
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Example columns for a non-clustered index

What are the good example columns for which I should never create an index? As per my understanding the clustered index should often be done on primary keys (default) as it represents base data as a whole. But on which columns I should never create…