 The operations are either the standard Map API for codice_1, codice_2, iterators, and so on, or at the lower level, codice_3, codice_4, codice_5, codice_6, codice_7, codice_8, and codice_9.Typical Items are about 30 bytes uncompressed in memory, but LOB's for example use 1 KB Items.Because each operation affects only one Item, small data structures are fast to access.