chickadee » lmdb-lolevel » MDB_RESERVE

MDB_RESERVEconstant

reserve space for data of the given size, but don't copy the given data. Instead, return a pointer to the reserved space, which the caller can fill in later. This saves an extra memcpy if the data is being generated later. This flag must not be specified if the database was opened with MDB_DUPSORT.