You are looking at the docs for an older version of Dgraph (v21.03). The latest version is v22.0.

Batch Mutations

Each mutation may contain multiple RDF triples. For large data uploads many such mutations can be batched in parallel. The command dgraph live does just this; by default batching 1000 RDF lines into a query, while running 100 such queries in parallel.

dgraph live takes as input gzipped N-Quad files (that is triple lists without { set {) and batches mutations for all triples in the input. The tool has documentation of options.

dgraph live --help