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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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Confusion about multi compose index within one table

I have a book online sale website, in the system, there is a table called Order, and there are some columns like below: OrderID int (Primary key), Library_ID int, Mode int, BookId int, Ext_User_ID varchar(2000), Activated varchar(1), RequiredDate…
danmiao
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Does performance improve when placing a nonclustered index on a field that already has a clustered index?

I executed an update statement along the following lines yesterday: UPDATE MainTable Set SomeField = SubsetTable.SomeField where MainTable.MainTableKey = SubsetTable.MainTableKey where SubsetTable is a subset of MainTable and has the same Primary…
Karl
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Adding Non clustered index

So the current query I have takes long time to run. When i run execution plan, it shows: Table Insert (#tempdata), Cost: 99%. I realized i need to add non clustered index to run the query fast. So I have added this line of code but still there is no…
Sahil K
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Can i drop a column of a table in SQL server which is having a non clustered index defined on it

I have a table with huge record count . Some of the columns have a non clustered indexes defined on them . we are required to alter/drop few columns which are having such indices defined. I have directly alter/dropped the columns , but did not get…
Sai Avinash
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Which index is better non-clustered vs clustered in this case?

I have a table which has 4 columns (region_id, product_id, cate_id, month_id) as a primary key. This primary key was created as default, so a clustered index were created for PK. This table contains more than 10 millions rows. If I delete existing…
Kay
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How clustered and Non clustered index makes search faster?

Clustered indexes physically order the data on the disk. Say i have table employee and columd employee_id. Now i store values 9, 6, 10, 4 under employee_id. with clustered index on employee_id. values on disk will be stored in sorted fashion i.e 4,…
M Sach
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index is not working while using ROW_NUMBER in sql server

I have used Row_Number() to implement the paging in my stored procedure. Paging is working fine. But problem is, after implementing the Row_Number(), indexes does not work & a Clustered index SCAN happens even if I use the primary key column in…
Anuj Rathi
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Does parenthesis influence the index usage in SQL Server?

I understand that the order of criteria in the where clause does not influence index usage. Does parenthesis influence the index usage in SQL Server? Is there any example?
variable
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Adding non clustered index to temp tables for firing query quick in SSMS

So the current query I have takes 3 hours to run and realize i need to add non clustered index to run the query fast. So I have added this line of code but still its taking massive time with no result: create nonclustered index #temp_index on…
Sahil K
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