neo4j

问题 I'm using Neo4j server. I'm running into an issue where the loads are relatively low. However, the response times are quite high. I think that the number of threads servicing requests is simply too small. Is there a way to adjust the size of the thread pool for servicing HTTP requests. Is that possible? 回答1: It's a common misconception that more threads equals more performance. In reality it's often the other way around -- more threads equals lesser performance. I don't know how your graph or

问题 I want to make IMDB's characters/roles structure in Neo4j. I'll need labels Person , Movie and Character . Character , because a character can be in multiple movies, played by different people. Without Character , it's easy: (Person)-[:PLAYS_IN]->(Movie) But PLAYS_IN is a Character , so it would be something like: (Person)-[:PLAYS_AS]->(Character)-[:PLAYS_IN]->(Movie) but that doesn't work, because it doesn't have a direct Person-Movie relationship. Without that, everyone who ever played

问题 Typically we can query property value for something like: Match (n:Product) where n.name="iPhone X" return n However, in my case, I don't know which property I should match, but I only know the value, in which case the property name becomes a kind of variable. I want something like this: Match (n:Product) where n.{name}="iPhone X" return n or with relationship variable r: Match (n:Product)-[{r}]->(c:Color {name:'white'}) In both cases, in my application I know some property or relationship

问题 Can I create multiple relationships of the same type between the same two nodes? I am trying to discover patterns in nodes connected with the same relationship type. For e.g., relation PERFORMED_BY could have a property to record Person1 as the performer with a timestamp for the transition from node A to node B and a second relation PERFORMED_BY could have Person2 as the performer at a different time between the same two nodes. 回答1: Yes, you can have multiple relationships of the same type

问题 I try to write a webapp using Spring Data Neo4j. I have an Repository: public interface UserRepository extends GraphRepository<Neo4jUser> {} an applicationcontext.xml: ... <context:component-scan base-package="de.wilke.test.neo4j" > <context:exclude-filter type="annotation" expression="org.springframework.stereotype.Controller"/> </context:component-scan> <!-- REST Connection to Neo4j server --> <bean id="restGraphDatabase" class="org.springframework.data.neo4j.rest.SpringRestGraphDatabase">

问题 I am just getting started with Neo4j and py2neo. I am experimenting with the batch feature available in py2neo for bulk data loading of a neo4j database. At a basic level, I want to create two nodes (or get them if they already exist) and create a relationship between them with a default weight (or increment the weight if the relationship already exists) using WriteBatch in py2neo. The documentation explains only how to create two new nodes and form a relationship between them. I am looking

问题 I'm using version 2.0.1 . I have like hundred of thousands of nodes that needs to be inserted. My neo4j graph db is on a stand alone server, and I'm using RestApi through the neo4j rest graph db library to achieved this. However, I'm facing a slow performance result. I've chopped my queries into batches, sending 500 cypher statements in a single http call. The result that I'm getting is like: 10:38:10.984 INFO commit 10:38:13.161 INFO commit 10:38:13.277 INFO commit 10:38:15.132 INFO commit

问题 I am playing around in the rails console with Neo4j and tried to create a model class like this: Object.const_set("TestNode", Class.new(super_class=Neo4j::Rails::Model)) node = TestNode.new if i then try to save the instance with node.save I get a bunch of errors: node.save NoMethodError: undefined method `each' for nil:NilClass from /Users/oskbor/.rvm/gems/jruby-1.6.7.2/gems/neo4j-2.0.0-java/lib/neo4j/rails/attributes.rb:57:in `init_on_create' from /Users/oskbor/.rvm/gems/jruby-1.6.7.2/gems

问题 I am using graphaware to connect to a neo4j graph database. I keep getting an error saying Fatal error: Uncaught Error even though I'm using the library in composer.json. Here is the code for the autoload.php: <?php /* * This file is part of the GraphAware Neo4j PHP OGM package. * * (c) GraphAware Ltd <info@graphaware.com> * * For the full copyright and license information, please view the LICENSE * file that was distributed with this source code. */ error_reporting(E_ALL | E_STRICT);

问题 I have tried following the official guide provided by neo4j for installation in Ubuntu,but at one point I wrongly added 2 entries in the sources.list file and tried installing. After that I removed the entries and started from the beginning but It shows this error. $ sudo apt-get install neo4j Reading package lists... Done Building dependency tree Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are