Optimum Data Length for MySQL Data
Briefly

First and last names in databases are commonly allocated 30 characters, while middle names can be set to 20 characters. Cities and counties typically require around 30 characters, state codes are standardized at 2 characters, and country names might reach up to 50 characters depending on the context. Although modern databases can handle unused space effectively, setting realistic field lengths is essential for enforcing data integrity and ensuring that the database can efficiently manage the data being entered. Over-allocating space can lead to inconsistencies in data validation and handling.
For first and last names, a length of around 30 characters is typically sufficient for most cases. Middle names can often be shorter, around 20 characters.
Cities and counties usually fit within 30 characters as well. State abbreviations are standard at 2 characters, while country names might go up to 50 characters.
While modern databases do optimize space utilization, defining appropriate lengths helps prevent issues with data consistency and validation.
Using VARCHAR(50) for every field can lead to unnecessary allocation. Assessing typical lengths in your specific use case can lead to more efficient data storage.
Read at SitePoint Forums | Web Development & Design Community
[
|
]