It's a limitation of the current Cypher runtime, and to some degree the current Neo4j database kernel. Parallelising query execution is a recent area of research, and not many industrial databases can do it yet. I'm sure it will show up in Neo4j as well some day.
-- Chris Vest System Engineer, Neo Technology > On 12 Feb 2017, at 09.36, unrealadmin23 via Neo4j <neo4j@googlegroups.com> > wrote: > > > Hi, > > I often run deep/complex queries on my very large data-set that some take > hours of run-time. > These queries appear to be single threaded and make little use of the > available CPU resources. > Am I missing something or is there a way to parallelise queries ? > > A simple example might be, but not limited to 'get all of my unique > relationships': > > neo4j-sh (?)$ START r=rel(*) return distinct type(r) ; > > If it is not possible to paralise queries, then I presume that this is a > limitation of Java ? If so, has anyone considered re-writing Neo4j in a HPC > language such as OpenMP ? > > Thanks, Wayne. > > -- > You received this message because you are subscribed to the Google Groups > "Neo4j" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to neo4j+unsubscr...@googlegroups.com. > For more options, visit https://groups.google.com/d/optout. -- You received this message because you are subscribed to the Google Groups "Neo4j" group. To unsubscribe from this group and stop receiving emails from it, send an email to neo4j+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.
