neo4j - neostore.* file size after deleting millions node

Question

I use neo4j 1.9.4, i store 28M nodes, 267M properties and 157M relationships.

the neostore.* files :

-rw-r--r-- 1 user wheel 10961964959 7 fév 09:58 neostore.propertystore.db
-rw-r--r-- 1 user wheel 5185764606 7 fév 09:58 neostore.relationshipstore.db
-rw-r--r-- 1 user wheel 3550760192 7 fév 09:58 neostore.propertystore.db.strings
-rw-r--r-- 1 user wheel 249658236 7 fév 09:58 neostore.nodestore.db

I delete 26M nodes and the neostore.* is not reduce :

-rw-r--r-- 1 user wheel 10961964979 7 fév 10:20 neostore.propertystore.db
-rw-r--r-- 1 user wheel 5185764630 7 fév 10:20 neostore.relationshipstore.db
-rw-r--r-- 1 user wheel 3550760218 7 fév 10:20 neostore.propertystore.db.strings
-rw-r--r-- 1 user wheel 249658252 7 fév 10:20 neostore.nodestore.db

i remove all nodes from 'ticket' index, the lucene index /index/lucene/node/ticket folder is empty when i count all tickets nodes i get 0 -> OK

why neostore.* file size is not reduce ?

here the delete code =

EndResult<Ticket> tickets = ticketRepository.findByDate(date); // by 1000
Iterator<Ticket> itTicket = tickets.iterator(); 

  while (itTicket.hasNext()) { 

 Ticket t = itTicket.next(); 
 Node n = neo4jTemplate.getGraphDatabase().getNodeById(t.getId()); 
 neo4jTemplate.getIndex("Ticket").remove(n); 

 Iterable<Relationship> relationships = n.getRelationships(); 

  for (Relationship relationship : relationships) { 

    relationship.delete(); 
 }
 n.delete(); 

 }

Can you help me ? Charles regards

Answer 1

Actually the nodestore is not instantly compacted after you delete nodes. Instead if you create new nodes they will reclaim the previously deleted ares with in nodestore.