[teepark]

http://linux.die.net/man/2/fcntl

actually it could use row-level locking since it uses row-oriented storage and fcntl locks can be applied to a set of bytes within a file. it could also do file-level locking on tempfiles with names derived from the table name and primary key of the row.

anyone with actual knowledge of it care to chime in with what it does do?

[alttab]

I have actual knowledge of it. The product I work on uses it as the production database because we distribute the software as a desktop application (and MySQL has licensing issues).

It COULD do row level locking, but it doesn't. SQLitening is the closest thing to performant SQLite you will get. And it only runs on Windows.