SQLite Forum

Native support for pluggable backends in SQLite
Login
SSN makes a lower concurrency level like MVCC serialized. It is built on top of the MVCC KV data record and adds a few words of timestamp just after the KV data record to serialize the commits.  It use is optional in the "dbstack" for non MVCC concurrency records.

record locking : a simple KV store record would stack its values and return its recno which is indexed by an extendible array of file offsets and 1 bit of recno latch.