[−]Constant nimiq_database::lmdb::open::NOMEMINIT
pub const NOMEMINIT: Flags
Don't initialize malloc'd memory before writing to unused
spaces in the data file. By default, memory for pages written
to the data file is obtained using malloc. While these pages
may be reused in subsequent transactions, freshly malloc'd
pages will be initialized to zeroes before use. This avoids
persisting leftover data from other code (that used the heap
and subsequently freed the memory) into the data file. Note
that many other system libraries may allocate and free memory
from the heap for arbitrary uses. E.g., stdio may use the heap
for file I/O buffers. This initialization step has a modest
performance cost so some applications may want to disable it
using this flag. This option can be a problem for applications
which handle sensitive data like passwords, and it makes memory
checkers like Valgrind noisy. This flag is not needed with
WRITEMAP
, which writes directly to the mmap instead of using
malloc for pages. The initialization is also skipped if
RESERVE
is used; the caller is expected to overwrite all of
the memory that was reserved in that case. This flag may be
changed at any time using Environment::set_flags()
.