How to populate an OrientDB Time Series? - orientdb

Question

I want to create an OrientDB time series year-->month-->day-->hour-->minute-->second.
The example on OrientDB wiki shows only how to create the classes and how to manage the search.
I tried to populate my graph by using this code, but this approach requires over 2 minutes if limited on hours, as another user said here. Going at level of seconds, a similar method requires around 12 hours.
Is it normal? Are there better approach?
Thank you to everybody that will answer my question.
PS: I have already read the Milan 2014 slides, but it only explains the structure (that I have clear) and a way to retrieve the data.

Answer 1

Can you try with this code ?
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import com.orientechnologies.orient.client.remote.OServerAdmin;
import com.orientechnologies.orient.core.metadata.schema.OClass;
import com.orientechnologies.orient.core.metadata.schema.OType;
import com.tinkerpop.blueprints.impls.orient.OrientGraph;
import com.tinkerpop.blueprints.impls.orient.OrientGraphNoTx;
import com.tinkerpop.blueprints.impls.orient.OrientVertex;
public class TimesSeriesMain {
public static void main(String[] args) {
OServerAdmin serverAdmin;
try {
serverAdmin = new OServerAdmin("remote:localhost/myTimeSeries").connect("root", "root");
if(!serverAdmin.existsDatabase()){
serverAdmin.createDatabase("myTimeSeries", "graph", "plocal");
OrientGraphNoTx graph_c=new OrientGraphNoTx("remote:localhost/myTimeSeries");
OClass hour_c=graph_c.createVertexType("Hour", "V");
hour_c.createProperty("value", OType.INTEGER);
OClass day_c=graph_c.createVertexType("Day", "V");
day_c.createProperty("hour", OType.LINKSET, hour_c);
OClass month_c=graph_c.createVertexType("Month", "V");
month_c.createProperty("day", OType.LINKMAP, day_c);
OClass year_c=graph_c.createVertexType("Year", "V");
year_c.createProperty("value", OType.INTEGER);
year_c.createProperty("month", OType.LINKMAP, month_c);
graph_c.shutdown();
OrientGraph graph=new OrientGraph("remote:localhost/myTimeSeries");
long start = System.currentTimeMillis();
for (int yy = 2015; yy < 2016; yy++){
Map<Integer, OrientVertex> months = new HashMap<>();
for (int mm = 0; mm < 12; mm++){
Map<Integer, OrientVertex> days = new HashMap<>();
for (int dd = 1; dd < 32; dd++){
List<OrientVertex> hours = new ArrayList<OrientVertex>();
for (int i = 0; i < 24; i++){
OrientVertex hour=graph.addVertex("class:Hour");
hour.setProperty("value",i);
hours.add(hour);
}
OrientVertex day=graph.addVertex("class:Day");
day.setProperties("hour",hours);
days.put(dd,day);
}
OrientVertex month=graph.addVertex("class:Month");
month.setProperties("day",days);
months.put(mm,month);
}
OrientVertex year=graph.addVertex("class:Year");
year.setProperties("value",yy);
year.setProperties("month",months);
}
long end=System.currentTimeMillis();
System.out.println(((end-start)) + " millisec") ;
graph.shutdown();
}
}
catch(Exception e){
System.out.println(e);
}
}
}
Hope it helps.