In SQL Server, the clustered index key is automatically used in non-clustered indexes. Therefore, it's recommended to choose a short clustered index key to minimize storage and improve performance.

NOT NULL columns in the index key – memory-optimized indexes do not support nullable columns; all columns in the index key must be declared as NOT NULL. Guidelines for choosing indexes. A few simple ...

Keep the length of the index key short for clustered indexes. Additionally, clustered indexes benefit from being created on unique or non-null columns. Columns that are of the ntext, text, image, ...

Columnstore indexes are available in CTP 3 of SQL Server Code Name “Denali.” You can create a columnstore index on your table by using a slight variation on existing syntax for creating indexes. To ...

pg-index-health-sql provides a curated set of raw SQL queries designed to identify common schema issues in PostgreSQL databases — such as redundant indexes, missing primary keys or inefficient table ...

SQL Server 2012 has a lot of metadata about columnstore indexes. For example, sys.indexes show column store indexes as type = 6 and type_desc as ‘NONCLUSTERED COLUMNSTORE.’ There also are two new ...

A table is made up of columns and rows. Columns contain the column name and data type. Rows contain the records or data for the columns. Basic SQL . Each record has a unique identifier or primary key.