A Limbo page is an optimization in WiredTiger such that when the readers only need the on-disk image values from the page, the page history from Lookaside is not loaded into the memory. Such a page which has the on-disk image in memory and history in Lookaside is called a Limbo page.

With PM-1248 we will be able to search through the history directly from the lookaside and hence won’t need to decide between either loading the history into the memory or not. Hence obsoleting the Limbo pages.

This ticket tracks the work required to remove the Limbo pages.