Hi again, Thanks Micheal for your answer.
I want multiple applications (e.g., web servers) connect to my database to process requests. These applications are different processes running on different PCs. They must access data from the same graph database. Is there any way to support this? On Thursday, March 6, 2014 2:07:39 PM UTC-8, Reihane Boghrati wrote: > > Creating users and resources and their relationship and the properties, is > random. Each time program calls insert entity with properties, it creates a > node or relationship (based on inputs). I'm not aware of the data > beforehand so I have to put the insert entity function in a transaction. > > On Wednesday, March 5, 2014 11:09:02 PM UTC-8, Michael Hunger wrote: >> >> If you import them all at once you should have larger transaction sizes, >> anything from 1000 to 50000 elements per transaction. >> >> See this for an explanation: >> http://jexp.de/blog/2013/05/on-importing-data-in-neo4j-blog-series/ >> >> Michael >> >> >> Am 06.03.2014 um 07:18 schrieb Reihane Boghrati <r.bog...@gmail.com>: >> >> I use multiple threads (200 threads). >> I have 10,000 users, 4 friends per user and 10 resource per users. The >> relations are like: >> (users) -[firnedships]->(users) >> (resources)-[createdFor]->(users) >> (users)-[create]->(resources) >> >> First I create all users nodes, then I create friendship between two >> given users. Finally I create resources node and its two relationship, >> create and createdFor. >> Each of them is one transaction. (creating of each user, creating of each >> friendship, creating of each resource with its relationship) >> and it takes roughly about 4 hours!!! >> Is this common, or am I doing something wrong? >> >> On Wednesday, March 5, 2014 10:03:13 PM UTC-8, Michael Hunger wrote: >>> >>> Why? >>> >>> You can load them in less than a second >>> >>> Or use multiple threads >>> >>> Sent from mobile device >>> >>> Am 06.03.2014 um 05:41 schrieb Reihane Boghrati <r.bog...@gmail.com>: >>> >>> I want to load my database with 10,000 users nodes with 4 process. Is >>> there any possibility to do that? >>> For example can I specify a different db_path for each process and run >>> them? >>> >>> On Wednesday, March 5, 2014 8:14:14 PM UTC-8, Michael Hunger wrote: >>>> >>>> Only one active process at a time can access the storage files. >>>> >>>> What do you want to do? >>>> >>>> Michael >>>> >>>> Am 06.03.2014 um 01:03 schrieb Reihane Boghrati <r.bog...@gmail.com>: >>>> >>>> Hi, >>>> >>>> How can I load my database with multiple processes? >>>> >>>> This is my init function: >>>> >>>> static GraphDatabaseService graphDb; >>>> private static final String DB_PATH = >>>> "C:/Users/Reihane/Documents/Neo4j/default.graphdb"; >>>> public boolean init() throws DBException { >>>> if (graphDb == null) >>>> graphDb = new GraphDatabaseFactory().newEmbeddedDatabase(DB_PATH); >>>> engine = new ExecutionEngine(graphDb); >>>> return true; >>>> } >>>> >>>> and this is the exception my code throws: >>>> >>>> java.lang.RuntimeException: Error starting >>>> org.neo4j.kernel.EmbeddedGraphDatabase, >>>> C:\Users\Reihane\Documents\Neo4j\default.graphdb >>>> at >>>> org.neo4j.kernel.InternalAbstractGraphDatabase.run(InternalAbstractGraphDatabase.java:333) >>>> at >>>> org.neo4j.kernel.EmbeddedGraphDatabase.<init>(EmbeddedGraphDatabase.java:63) >>>> at >>>> org.neo4j.graphdb.factory.GraphDatabaseFactory$1.newDatabase(GraphDatabaseFactory.java:92) >>>> at >>>> org.neo4j.graphdb.factory.GraphDatabaseBuilder.newGraphDatabase(GraphDatabaseBuilder.java:198) >>>> at >>>> org.neo4j.graphdb.factory.GraphDatabaseFactory.newEmbeddedDatabase(GraphDatabaseFactory.java:69) >>>> at Neo4j.Neo4jClient.init(Neo4jClient.java:168) >>>> at edu.usc.bg.base.DBWrapper.init(DBWrapper.java:62) >>>> at edu.usc.bg.base.Client.executeDoLoad(Client.java:1013) >>>> at edu.usc.bg.base.Client.runBG(Client.java:892) >>>> at edu.usc.bg.BGMainClass.main(BGMainClass.java:41) >>>> Caused by: org.neo4j.kernel.lifecycle.LifecycleException: Component >>>> 'org.neo4j.kernel.StoreLockerLifecycleAdapter@7a536ac6' was successfully >>>> initialized, but failed to start. Please see attached cause exception. >>>> at >>>> org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:504) >>>> at org.neo4j.kernel.lifecycle.LifeSupport.start(LifeSupport.java:115) >>>> at >>>> org.neo4j.kernel.InternalAbstractGraphDatabase.run(InternalAbstractGraphDatabase.java:310) >>>> ... 9 more >>>> Caused by: org.neo4j.kernel.StoreLockException: Unable to obtain lock >>>> on store lock file: >>>> C:\Users\Reihane\Documents\Neo4j\default.graphdb\store_lock. Please ensure >>>> no other process is using this database, and that the directory is >>>> writable >>>> (required even for read-only access) >>>> at org.neo4j.kernel.StoreLocker.checkLock(StoreLocker.java:87) >>>> at >>>> org.neo4j.kernel.StoreLockerLifecycleAdapter.start(StoreLockerLifecycleAdapter.java:44) >>>> at >>>> org.neo4j.kernel.lifecycle.LifeSupport$LifecycleInstance.start(LifeSupport.java:498) >>>> ... 11 more >>>> Caused by: java.io.IOException: Couldn't lock lock file >>>> C:\Users\Reihane\Documents\Neo4j\default.graphdb\lock because another >>>> process already holds the lock. >>>> at >>>> org.neo4j.kernel.impl.nioneo.store.FileLock.getLockFileBasedFileLock(FileLock.java:115) >>>> at >>>> org.neo4j.kernel.impl.nioneo.store.FileLock.getOsSpecificFileLock(FileLock.java:63) >>>> at >>>> org.neo4j.kernel.DefaultFileSystemAbstraction.tryLock(DefaultFileSystemAbstraction.java:89) >>>> at org.neo4j.kernel.StoreLocker.checkLock(StoreLocker.java:74) >>>> ... 13 more >>>> >>>> -- >>>> 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+un...@googlegroups.com. >>>> For more options, visit https://groups.google.com/groups/opt_out. >>>> >>>> >>>> >>> -- >>> 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+un...@googlegroups.com. >>> For more options, visit https://groups.google.com/groups/opt_out. >>> >>> >> -- >> 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+un...@googlegroups.com. >> For more options, visit https://groups.google.com/groups/opt_out. >> >> >> -- You received this message because you are subscribed to the Google Groups "Neo4j" group. 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