Constant lmdb::NO_META_SYNC

pub const NO_META_SYNC: EnvironmentFlags = EnvironmentFlags{bits: MDB_NOMETASYNC,}

Flush system buffers to disk only once per transaction, omit the metadata flush. Defer that until the system flushes files to disk, or next non-READ_ONLY commit or Environment::sync. This optimization maintains database integrity, but a system crash may undo the last committed transaction. I.e. it preserves the ACI (atomicity, consistency, isolation) but not D (durability) database property.

This flag may be changed at any time using Environment::set_flags.