Cassandra Practice Test

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What data type would you use in Cassandra to represent a universally unique identifier?

TEXT
INT
UUID
TIMEUUID

The correct answer is: UUID

Using the UUID data type in Cassandra is specifically designed for representing universally unique identifiers. UUIDs are a standardized format for creating identifiers that are unique across both space and time, making them ideal for distributed systems like Cassandra, where data may be created across different databases or nodes. The UUID type ensures that each identifier is 128 bits long and has a very low probability of duplication, which is essential for maintaining data integrity in systems with potentially concurrent writes from various sources. In contrast, the other data types listed do not provide the same uniqueness or meant for different purposes. TEXT is used for string data and does not offer any guarantee of uniqueness. INT is a numeric type suited for integers and is limited in terms of range and uniqueness due to its binary-based nature. TIMEUUID, while related to UUIDs, is specifically designed to represent UUIDs that are time-based, introducing an element of temporal ordering, which may not be necessary in every use case.