6 Important Types Of Indexes In SQL Server


The index is named as a design in SQL server stored or maintained wilt in-memory structure or on disk related with a table or views, which is utilized principally to recognize a specific set or a row Table or Views. Indexes in SQL are the individual lookup tables, which are utilized by the data set internet searcher to accelerate the general information recovery.
The use of the index in SQL is to rapidly discover the data in a data set table without looking through each row of it. In SQL Index, it is basic to keep up more extra storage to make a copy duplicate of the data set. Tables in SQL server are contained inside database item holders that are called Schemas. The schema likewise fills in as a security limit, where you can restrict data set client authorizations to be on a particular schema level as it were. To know what are the different types of Indexes in SQL Server, then read this article to explore them and have a better understanding of them.

Different Types of Indexes in SQL Server

types of indexes in sql server types of indexes in sql server

There are various types of indexes in SQL server:

  1. Clustered Index
  2. Non-Clustered Index
  3. Column Store Index
  4. Filtered Index
  5. Hash Index
  6. Unique Index

1. Clustered Index

Clustered Index stores and sort rows of data in a view or table depending on their central values. There may be an instance of having just one clustered index in each table, as it can empower the client to store data in a solitary request. Clustered index store data in an arranged way, and in this way, at whatever point data is contained in the table in an arranged manner implies it is orchestrated with a clustered index.

At the point when a table contains a clustering in SQL server, it is named a clustered table. A clustered index is liked to utilize when adjustment of gigantic information is needed in any data set. If the data put away in a table or data set are not organized in descending or ascending request, at that point, the data table is named as a heap.

2. Non-Clustered Index

It represents a structure, which is isolated from data rows. This types of indexes in SQL server covers the non-clustered key values, and each worth pair has a pointer to the data row that comprises vital significance.

In the non-clustered index, the client can undoubtedly add non-key to the leaf level, as it sidesteps the current index key cut-off points and performs completely covered recorded questions. A non-clustered index is made to improve the general exhibition of much of the time posed inquiries, which are not covered by grouped things.

Clustered vs. Non-clustered index in SQL server is that the non-clustered index stores the data at one area and indices at another area, while the clustered index is a kind of index that sorts the data rows in the table on their key values.

3. Column store Index

A column store index is one of the types of indexes in SQL Server that has a standard type of index with regards to putting away and questioning enormous data warehousing truth tables. This is an index of SQL, which was intended for development in the presentation of inquiry in the event of jobs with huge measures of data.

The column-store index empowers putting away information inside little impressions, which helps in speeding up. The use of this index takes into account the client to get IO with multiple times higher inquiry execution when contrasted with conventional column arranged capacity. For examination, the Columnstore Index gives a significant degree to have a preferable exhibition over other records in SQL. Column store index esteems from a similar area have comparative qualities, which expands the general pace of information compressions.

4. Filtered Index

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A filtered index is one of the types of indexes in an SQL server that is made when a column has just a few applicable numbers for questions on the subset of values. If, when a table comprises heterogeneous data rows, a separated list is made in SQL for at least one sort of data.

5. Hash Index

Hash Index is one of the types of indexes in SQL server that slots containing a pointer or an array of N buckets and a row on each slot or bucket. It utilizes the Hash function F (K, N), where N is several buckets and K is critical. The capacity delineates the key relating to the bucket of the hash index. Every bucket of the Hash Index comprises eight bytes, which are utilized to stock the memory address of the connected rundown of basic sections.

6. Unique Index

The unique index in the SQL server confirms and guarantees that the index key doesn’t contain any copy esteems and along these lines, empowers the clients to examine that each row in the table is exceptional in either way.

The unique index in SQL is extraordinarily utilized when the client needs to have an extraordinary trait of every information. It permits people to guarantee the data respectability of each characterized section of the table in the data set. This index likewise gives extra data about the data table, which is useful to question enhancers.

Types of Pages in SQL server

  • Data Pages
  • Bulk Changed Map
  • Text/Image Pages
  • Page Free Space
  • Index Allocation Map
  • Secondary Global Allocation Map
  • Differential Changed Map
  • Global Allocation Map

Types of the Database in SQL server

  • tempdb
  • msdb
  • Master
  • Model


To create an index in the SQL statement is utilized to make files in tables. Indexes are utilized to recover information from the data set more rapidly than something else. The clients can’t see the lists, they are simply used to accelerate queries/searches.

An Index is a key worked from at least one column in the information base that speeds up getting rows from the view or table. This key aids a Database like MySQL, SQL Server, Oracle, and so on to discover the row related to key qualities rapidly.

An index stores the total information in the table, which is coordinated coherently with rows and columns, and truly kept up and put away in line shrewd data known as row store and if the records are stored away in segment insightful data, known as Column store.

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