This could possibly be the Lilith's Brood trilogy (Dawn, Adulthood Rites, and Imago) by Octavia E. Butler.
...story begins after a terrible nuclear war that left the earth
uninhabitable. Humans are all but extinct. The few survivors are
plucked from the dying earth by an alien race, the Oankali. The
protagonist Lilith Iyapo (a black human female) awakens 250 years
after the war on a living Oankali ship. At first, she is repulsed by
the alienness of her saviors/captors.
While the humans are not slaves, they are initially only brought out of suspension into contexts where they are either kept in solitude and interrogated, or where they are integrated into an Oankali family unit.
The Oankali do remember everything, even as far back as being in utero, and this is one of the improvements they extend to humans who become family with them - in the first book, the Ooloi who is attempting to bring Lilith into a familial unit refuses to allow her paper because it is a crutch. She asks for it to try and learn their language; he is contemptuous that if she would permit (via genetic manipulation) her memory to be extended she would not need paper to learn the language, she would merely start remembering everything.
Lilith later would go on to shepherd several dozen other humans through awakening and into awareness of their status as guests of an alien species. Humans being humans, they end up using edged weapons on each other and on the Oankali. In the second and third books, as humans and Oankali resettle on parts of the healing earth, the non-integrated humans bootstrap themselves up to guns, which are more commonly used on other humans than on Oankali.