lmdb_zero::open::WRITEMAP

pub const WRITEMAP: Flags = Flags{bits: ffi::MDB_WRITEMAP,}

Use a writeable memory map unless RDONLY is set. This is faster and uses fewer mallocs, but loses protection from application bugs like wild pointer writes and other bad updates into the database. Incompatible with nested transactions. Do not mix processes with and without WRITEMAP on the same environment. This can defeat durability (Environment::sync etc).