我最近开始使用导入工具来加快加载速度,到目前为止,结果很有希望,除了它们之后通过cypher没有反映在我的数据库中。
我的流程:
$ /path/to/neo4j-community-3.0.3/bin/neo4j stop
$ rm -rf /path/to/neo4j-community-3.0.3/data/
$ mkdir /path/to/neo4j-community-3.0.3/data
$ /path/to/neo4j-community-3.0.3/bin/neo4j-import --nodes:record /path/to/records.csv --into /path/to/neo4j-community-3.0.3/data
tmp.csv:
meta:ID,time:long,lat:float,lon:float
KAQP_20140420v20001_0000,1397970000,26.9387950897,-91.2847290039
KAQP_20140420v20001_0001,1397970060,26.9387989044,-91.2847595215
.... (1440 lines of the same record format) ...
调用neo4j-import工具的结果:
Neo4j version: 3.0.3
Importing the contents of these files into neo4j-community-3.0.3/data:
Nodes:
:record
/neo4j/tmp.csv
Available memory:
Free machine memory: 23.65 GB
Max heap memory : 6.87 GB
Nodes
Done in 384ms
Prepare node index
[*:7.63 MB------------------------------------------------------------------------------------] 0
Done in 34ms
Calculate dense nodes
Done in 10ms
Node --> Relationship Sparse
Done in 10ms
Relationship --> Relationship Sparse
Done in 10ms
Node counts
Done in 51ms
Relationship counts
Done in 10ms
IMPORT DONE in 2s 360ms. Imported:
1440 nodes
0 relationships
5760 properties
很棒,到目前为止一切看起来都很棒。所以现在我启动neo4j:
$ /path/to/neo4j-community-3.0.3/bin/neo4j start
然后我尝试获取记录的数量:
$ /path/to/neo4j-community-3.0.3/bin/neo4j-shell -c 'MATCH (r:record) RETURN count(r) as count;'
+----------+
| count(r) |
+----------+
| 0 |
+----------+
1 row
42 ms
这很奇怪,所以我想也许标签没有注册或什么?所以我尝试了这个:
$ /path/to/neo4j-community-3.0.3/bin/neo4j-shell -c 'MATCH (r) RETURN count(r) as count;'
+----------+
| count(r) |
+----------+
| 0 |
+----------+
1 row
28 ms
这真的很奇怪。我的下一个想法可能是目录很奇怪?所以我测试了/path/to/neo4j-community-3.0.3/data
:
在:
$ du -sh /path/to/neo4j-community-3.0.3/data
4K
后:
$ du -sh /path/to/neo4j-community-3.0.3/data
53M
它肯定在那里!如果我错过了关键的一步,我不知道。无论如何都在想?
答案 0 :(得分:2)
当您致电$NEO4J_HOME/data/databases/graph.db
时,您需要指定目标neo4j-import
:
/path/to/neo4j-community-3.0.3/bin/neo4j-import --nodes:record /path/to/records.csv --into /path/to/neo4j-community-3.0.3/data/databases/graph.db
或在其他地方创建导入,并将$NEO4J_HOME/data/databases/graph.db
的内容替换为neo4j-import