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A columnstore index stores each column of a table in a separate segment, which is compressed and optimized for analytical queries that scan large amounts of data. A rowstore index stores each row of a table in a page, which is allocated in an extent.

Rows are a group of cells arranged horizontally to provide uniformity. Columns are a group of cells aligned vertically, and they run from top to bottom. Although the main reason for both rows and columns is to bifurcate groups, categories and so on, there is a fine line of difference between the two.

A columnstore index stores each column of a table in a separate segment, which is compressed and optimized for analytical queries that scan large amounts of data. A rowstore index stores each row of a table in a page, which is allocated in an extent.

The In-Memory Column Store (IM column store) stores tables and partitions in memory using a columnar format optimized for rapid scans. Oracle Database uses a sophisticated architecture to manage data in columnar and row formats simultaneously.

Row-oriented databases are ideal for some access patterns, specifically transactional processing, while column-oriented databases are better suited for analytical processing. The database type you choose ? row vs. columnar database ? is vital.

6.5. The ALTER TABLE SQL statement enables you to encrypt columns in an existing table. To add an encrypted column to an existing table, or to encrypt or decrypt an existing column, you use the ALTER TABLE SQL statement with the ADD or MODIFY clause.

The most common type of record storage is rowstore. It's your traditional method where SQL stores rows or records on an 8kb data page. Microsoft defines a rowstore as logically organized data as a table with rows and columns and physically stored in a row-wise data format.