What is a columnar Database and What are the GCP solutions for columnar databases?

A columnar database is a type of database management system that stores data in columns rather than rows, which makes it easier for analytical queries.

Google Cloud Spanner is a columnar database that provides strong consistency, atomic transactions, and serializable isolation.

Memory paging is a memory management technique that stores and retrieves data from secondary storage for use in main memory. By paging, programs in secondary storage can exceed the physical storage capacity, which is a crucial component of virtual memory.

To handle null values in data, you can use the following methods:

• Delete or exclude rows with null values
• Replace null values with a default value
• You can use interpolation techniques to fill in missing values

A deadlock in a DBMS (Database Management System) refers to a situation where multiple transactions are stuck and unable to proceed.