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Database migration refers to the process of transferring data from one database system to another, or from an older version of the same database system to a newer version. The objective of database migration is to upgrade or change the underlying database technology in order to improve performance, scalability, security, or to take advantage of new features.

Having all databases on one machine can lower the attack surface in the sense that it simplifies the security landscape, making it easier to secure the environment. With a single machine, it's possible to implement centralized security controls, such as firewalls and intrusion detection systems, that can protect the entire environment. Additionally, with all the databases on one machine, it's possible to apply security patches and updates in a centralized manner, reducing the risk of exploitation. This can also simplify the process of monitoring the environment for potential security threats.

However, there are also potential security risks associated with having all databases on one machine, especially in terms of availability and data protection. If the machine is compromised or becomes unavailable, all of the databases will be impacted. Additionally, if the machine is not properly secured, a malicious attacker could potentially gain access to all of the data stored on the machine. It's important to weigh the potential benefits and risks carefully when deciding whether to centralize databases on one machine or distribute them across multiple machines.