Which is better clustered or nonclustered index?

If you want to select only the index value that is used to create and index, non-clustered indexes are faster.

What is the difference between Columnstore index and clustered index?

A nonclustered columnstore index and a clustered columnstore index function the same. The difference is that a nonclustered index is a secondary index that’s created on a rowstore table, but a clustered columnstore index is the primary storage for the entire table.

What is disadvantage of nonclustered index?

Disadvantages of Non-clustered index A non-clustered index helps you to stores data in a logical order but does not allow to sort data rows physically. Lookup process on non-clustered index becomes costly.

Is primary key clustered or nonclustered?

If you configure a PRIMARY KEY, Database Engine automatically creates a clustered index, unless a clustered index already exists. When you try to enforce a PRIMARY KEY constraint on an existing table and a clustered index already exists on that table, SQL Server enforces the primary key using a nonclustered index.

Which indexing is better in SQL?

On the other hand, clustered indexes can provide a performance advantage when reading the table in index order. This allows SQL Server to better use read ahead reads, which are asymptotically faster than page-by-page reads. Also, a clustered index does not require uniqueness.

What is the difference between row store and column store?

A row store stores a sequence of records that contains the fields of one row in the table. In a column store, the entries of a column are stored in contiguous memory locations.

Can we create non-clustered index on temp table?

Yes it is possible to create a nonclustered columnstore index on the temp table but not the table variable. This is one more reason, why one should consider using temp tables over table variables.

Can we remove clustered index from primary key?

Here is a simple answer to this question – No. It is not possible to drop clustered index if there is a primary key on the same table.