What is upgrade :
- Upgrading database from on postgresql release to newer one.
- PostgreSQL version number consist of a major and minor version number ex. 15.1.
- Major release of PostgreSQL , the internal data storage format is subject to change.
- Minor release never change the internal storage format and are always compatible with earlier and later minor releases of the same major version number.
- Before PostgreSQL version 17.0 version numbers consist of three number ex 15.0
Example : PostgreSQL 15 don't have incremental db backup functionality but in PostgreSQL 17 have incremental functionality
Reason for Upgrade
- Security Fixes
- Enhanced Features
- Resolved Bugs and other issues
- Reduced Costs
- End of Support
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