January 2019
Beginner
556 pages
14h 19m
English
Content preview from Learning PostgreSQL 11 - Third Edition
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PostgreSQL native data types
When designing a database table, you should take care to pick the appropriate data type. When the database goes to production, changing the data type of a column can become a very costly operation, especially for heavily-loaded tables. The cost often comes from locking the table, and in some cases, rewriting it. When picking a data type, consider a balance between the following factors:
- Extensibility: Can the maximum length of a type be increased or decreased without a full table rewrite and a full table scan?
- Data type size: Going for a safe option, such as choosing big integers instead of integers, will cause more storage consumption.
- Support: This factor is important for rich data types, such as XML, JSON, ...
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