In the following document:

https://confluence.ez.no/display/EZP51/Requirements+for+doing+a+normal+installation

There's a mention of ezpSessionHandlerDB, in the following location:

https://confluence.ez.no/display/EZP51/Requirements+for+doing+a+normal+installation#Requirementsfordoinganormalinstallation-Sessionparameters

ezpSessionHandlerDB no longer applies to eZP 5.x, as session handling is done through the Symfony stack, so this documentation section may prove to be confusing.