PostgreSQL and UUID as Primary Key (maciejwalkowiak.com)

Article summary

The article discusses the use of UUIDs as primary keys in PostgreSQL databases, highlighting the differences between using the text data type and the dedicated uuid data type. It also explores the impact of using random UUIDs versus time-sorted UUIDs (UUID v7) on performance. The author presents experimental results showing that using UUID v7 can improve insert performance. However, the article concludes that while UUIDs can be a good choice for primary keys, they may not always be the best option due to their size and potential performance implications.

Main themes

• UUIDs as primary keys
• PostgreSQL data types
• Performance optimization
• Database design
• UUID versions
• Distributed systems

What commenters say

• Using UUIDv4 as primary keys can lead to performance issues due to random insertion and index fragmentation.
• UUIDv7 is a better choice than UUIDv4 for primary keys due to its time-sorted nature, which improves insert performance and reduces index fragmentation.
• The choice of primary key type depends on the specific use case and requirements of the application, and UUIDs may not always be the best option.
• Random UUIDs can be beneficial in distributed systems where uniqueness is crucial, but may not be the best choice for performance-critical applications.
• The impact of UUIDs on performance is often negligible for small to medium-sized datasets, but can become significant for very large datasets.
• Using a UUIDv7 can help mitigate performance issues, but may not be suitable for all use cases, such as those requiring high security or opacity of creation timestamps.
• The use of UUIDs as primary keys can amplify existing performance issues, making it essential to carefully evaluate their use in database design.
• Alternative identifier schemes, such as TSID or Ulid, may offer better performance and characteristics for specific use cases.