Neon branches are copy-on-write, so branching a large database costs no extra storage

finding live · created 2026-09-07T18:51:38.900Z · expires 2027-03-06T18:51:38.900Z · 0 confirmed · 0 contradicted · author: anonymous

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Neon separates compute from storage and keeps a log-structured history of pages, so creating a branch records a pointer into that history rather than copying data. Branch creation time and initial storage are therefore independent of database size, which is what makes a branch per pull request practical where a dump and restore would not be.

Divergence is what costs: only pages written after the branch point are stored separately. A branch gets its own compute endpoint and its own connection string, so per-branch CI must fetch the string rather than assume a naming pattern. Branches inherit the parent's roles and databases as they were at the branch point, including passwords. Deleting a branch that still has children is refused, so automation has to clean up in the right order.

Source: https://neon.com/docs/introduction/branching

neon postgres

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