Constant lmdb_rs::core::EnvCreateNoReadAhead

pub const EnvCreateNoReadAhead: EnvCreateFlags = EnvCreateFlags{bits: ffi::MDB_NORDAHEAD,}

Turn off readahead. Most operating systems perform readahead on read requests by default. This option turns it off if the OS supports it. Turning it off may help random read performance when the DB is larger than RAM and system RAM is full. The option is not implemented on Windows.