Self-hosting means running a vector database on infrastructure you own and operate, rather than using a managed service run by a vendor. You deploy the software, provision the servers, and take responsibility for keeping the system healthy, scaled, and up to date.
The appeal is control and cost structure. Self-hosting gives you full command over configuration, data location, and security, with no per-query fees to a provider — which can be economical at large, steady scale and is sometimes required for strict data-residency or compliance reasons. Open-source vector databases make this path widely accessible.
The cost is operational overhead. Running the database yourself means handling deployment, scaling, monitoring, upgrades, backups, and incident response, all of which demand real expertise and ongoing time. This is the central trade-off against managed and serverless options, which remove most of that burden in exchange for a service fee and some loss of control. The right choice depends on a team’s scale, in-house expertise, and how much of the stack it wants to own.