Hibernate Postgres Slow Insert - postgresql

Question

I try to insert data into Postgres using JPA/Hibernate/Postgres.
The data is parsed from a CSV File and then should be saved into a postgres database. The code that persists the data looks as follows:
#Autowired
KundeRepository repo;
#Transactional
public void safe(Kunde kd) {
repo.save(kd);
}
public void safeAll(Iterable<Kunde> kt) {
repo.save(kt);
repo.flush();
}
The entity look as follows
public class account implements Serializable {
private static final long serialVersionUID = 1L;
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
}
#ManyToOne
Kunde kunde;
#OneToMany
List<TransaktionsGruppe> gruppen;
#Entity
#Table(name = "kunde")
#NoArgsConstructor
public class Kunde implements Serializable {
public static final String kundennummerKey = "KUNDENNUMMER";
private static final long serialVersionUID = 1L;
#Id
#Getter
#Setter
private String id;
#OneToMany
List<Account> accounts;
#Entity
#Table(name = "transaktionsgruppe")
public class Transaktionsgruppe implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
#ManyToOne
Account acc;
private String bezeichnung;
When I now pass a Collection to the safeAll method the inserts are really slow. Especially it seems to call the hibernate sequence for every insert. Is there a way to speed things up?
My configuration looks as follows:
datasource:
type: com.zaxxer.hikari.HikariDataSource
url: dburl
username: user
password: pw
hikari:
validation-timeout: 10000
health-check-properties: {"connectivityCheckTimeoutMs","1000"}
jpa:
show-sql: true
properties:
hibernate.cache.use_second_level_cache: false
hibernate.cache.use_query_cache: false
hibernate.generate_statistics: false
hibernate.jdbc.batch.size: 100
hibernate.order_inserts: true+
Currently show-sql is enabled. It is about 60000 Entities overall and it takes more than 20 Minutes. the entitties are rather small in size

Answer 1

Your safeAll() method is not annotated with #Transactional so Spring opens and closes a transaction for each item of your list. By annotating it, Spring will open and close one single transaction for the whole list.