Glossary

LOOP

Large Object or Oversized Page. An MDBM must be configured for large objects for there to be large object pages. An oversized page is one that is larger than the configured page size. Oversized pages are created by logically appending another page. This happens when a page runs out of space for a store.

LOS

Large Object Store.

• In V2, there was a distinct memory region to store large objects. Multiple 4KB block are bound together (as needed) to hold a large object. The LOS is limited to 1GB.
• In V3, there is not a separate memory region. However, there is only 1 large object per MDBM page, and multiple consecutive MDBM pages can be bound together to has a large object.

Oversized Page

Multiple MDBM physical pages that are contiguously bound together as one local MDBM page. Oversized pages are created during a store operation when there is insufficient space available on that page. After all other options to reclaim space have been exhausted (compressing the page, shaking that page) and oversized page is created.