Constant lmdb_rs::core::EnvMapAsync

pub const EnvMapAsync: EnvFlags = EnvFlags{bits: ffi::MDB_MAPASYNC,}

When using MDB_WRITEMAP, use asynchronous flushes to disk. As with MDB_NOSYNC, a system crash can then corrupt the database or lose the last transactions. Calling mdb_env_sync() ensures on-disk database integrity until next commit. This flag may be changed at any time using mdb_env_set_flags().