Transactions

See Python Quickstart — Transactions for a quick introduction.

Isolation level

HyperMesh DB implements READ COMMITTED isolation: a transaction sees the last committed state of the database. Uncommitted writes within the same transaction are buffered in memory and not visible to concurrent readers.

Rollback semantics

On rollback(), buffered inserts are discarded. Any inserts already flushed to the WAL during the transaction are neutralised by appending matching tombstone records.