每个批次的数据库插入似乎都会变慢。
这是插入代码：
public class Write {
public static void main(String[] args) {
final Connect con = new Connect();
final Random rand = new Random(1);
long start = System.currentTimeMillis();
long last = start;
System.out.format("Idx\tLast\tAvg\n");
for (int j = 0; j < 100; j++) {
final Transaction tx = con.session.beginTransaction();
try {
for (int i = 0; i < 1000; i++) {
final Man man = new Man(rand);
con.session.save(man);
}
tx.commit();
} catch (Exception e) {
tx.rollback();
throw new RuntimeException(e);
}
tx.close();
long loop = System.currentTimeMillis();
System.out.format("%d\t%d\t%d\n", j, (loop-last), ((loop - start) / (j + 1)));
last = loop;
}
long stop = System.currentTimeMillis();
System.out.format("Time to run:%d(sec)\n", (stop - start) / 1000);
}
}
连接到locatl文件：
public class Connect {
final public Session session;
public Connect() {
final Configuration configuration = new Configuration();
configuration.driverConfiguration()
.setDriverClassName("org.neo4j.ogm.drivers.embedded.driver.EmbeddedDriver")
.setURI("file:///home/fodon/neo");
final SessionFactory sessionFactory = new SessionFactory(configuration, "fod.neo.domain");
session = sessionFactory.openSession();
}
}
对象也很简单：
public class Man extends Entity {
String name;
Set<Car> cars;
public Man() {
}
public Man(final Random rand) {
name = RandomStringUtils.randomAlphanumeric(8);
cars = new HashSet<>();
for (int i = 0; i < rand.nextInt(10)+1; i++) {
cars.add(new Car(rand));
}
}
@Override
public String toString() {
final StringBuffer sb = new StringBuffer();
sb.append(String.format("%d:%s\n", getId(), name));
for (Car car : cars) {
sb.append("\t");
sb.append(car.toString());
}
return sb.toString();
}
}
Car对象存储拥有的汽车：
public class Car extends Entity {
String type;
public Car() {
}
public Car(Random rand) {
type = RandomStringUtils.randomAlphanumeric(10);
}
@Override
public String toString() {
return String.format("%d:%s\n", getId(), type);
}
}
两者都是实体：
public abstract class Entity {
@GraphId
protected Long id;
Entity() {
}
public long getId() {
return id;
}
}
每次插入时数据库似乎都会变慢。
插入时间（ms）
0 8166
1 3682
2 4139
3 5416
4 6153
5 6852
6 8462
7 10211
8 11764
9 12825
10 14176
11 15548
12 16212
13 19995
14 23751
15 25247
16 26173
17 27535
18 28170
19 29541
20 29715
...
30 51122
如果这样慢，它就无法扩展。 我怎样才能加快速度呢？