✅ Advantages

Resilient - a problem in one site will not stop other sites from working
Security - different types of access to different users, staff access can be limited to only their portion of the database
Network traffic - reduced so bandwidth costs are lower
A single site database still works even if the connection between sites is temporarily broken
Scaling - easy to expand if demand increases by adding an extra node
High performance - queries and updates are largely local so that there is no network bottleneck
Expense - either cheaper or more expensive, just be sure to justify
Provides an interface for the user to work with data
Acts as a backup that can be accessed in case of accidental loss of data
A centralised location for storing data

❌ Disadvantages

Needs careful planning to ensure the data transmission is sufficient to cope with bandwidth and data is not needlessly sent
Difficult to prevent duplication
Security can be difficult to enforce with multiple entry points to a distributed system
Distributed databases are difficult to set up.