SQLite Forum

SQLite: B tree and B+ tree
The file format is documented <https://www.sqlite.org/fileformat2.html>.

There are two kinds of B-Trees in SQLite:  Index B-Trees with no payload and Table B-Trees that have a payload.  I believe that they are what may be generally called B+Trees because they may contain multiple key entries per node, though that is really of about as much consequence as the fact that water is wet.