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up properly in L</single_txn>.

Also, this mode is less ideal if you want to have two processes sharing a cache,
because the data won't be visible on the other one till it exits! ☺

=head2 C<NOSYNC> Mode.

You can also tell LMDB B<NOT> to call C<sync> at the end of every transaction,
and this will greatly improve write performance due to IO being greatly delayed.

This greatly weakens the databases consistency, but that seems like a respectable
compromise for a mere cache backend, where a missing record is a performance hit, not a loss of data.

  use LMDB_File qw( MDB_NOSYNC MDB_NOMETASYNC );
  ...
  my $cache = CHI->new(
    ...
    flags => MDB_NOSYNC | MDB_NOMETASYNC
  );

This for me cuts down an operation that takes 30 seconds worth of writes down to 6 ☺.