Key Features of DOL Table structure

I'm am rediscovering many features of the DOL data page and index page structures.

1. On non-leaf DOL index pages, only the page # and shortest distinguishable part of the key is written.

     If "Carl" was the last key on index leaf #2 and

          "Connie" was the first key on index leaf #3

          then the non-leaf page would hold "Co",3 because "Co" was enough to distinguish Connie from Carl...

     This method possibly allows the non-leaf pages to maintain more entries than APL non-leaf pages.

2. On leaf DOL pages, the whole key is stored so that the index can retain the covered read features.