Why does Hibernate Select take so long to save ()?

Question

We are writing a new application against an existing database. I am using Spring Data JPA and just doing

MyRepository.save() 

for my new object using

MyRepository extends CrudRepository<MyThing, String>

I noticed in the logs that hibernate makes a choice before inserting, and that they take a lot of time, even if the queries use a primary key or index. I already asked a question on how to stop SELECT before insertion. I do not understand this. Now I'm just trying to figure out why so long.

I have a set of logs, so I see sql generated by hibernate. In one example, according to the registration time, this request takes about 4 seconds. This request requests a primary key. When I run sql, which hibernate generated in a db tool like dbvisualizer is returned to the hook, as expected.

I increased the sleep log to TRACE to see where the delay was, and found the following before and after the 4 second delay:

2017-08-11 13:45:40.099 TRACE 16136 --- [nio-8085-exec-1] o.h.l.p.e.i.AbstractLoadPlanBasedLoader  : Bound [2] parameters total
2017-08-11 13:45:44.023 TRACE 16136 --- [nio-8085-exec-1] o.h.r.j.i.ResourceRegistryStandardImpl   : Registering result set [SQLServerResultSet:6]

I am also wondering why it says 2 parameters are related when there was only 1 in sql.

Any ideas why these samples take so long? Especially in my Spring application, and not in another client like dbvisualizer?

EDIT: adding more details, sql, entity code

, ; , , Hibernate SELECT INSERT, , . 4 .

sql:

select customer0_.customer_id as customer1_4_0_, customer0_.first_name as first_na2_4_0_, customer0_.last_name as last_nam3_4_0_ from my_customer_table customer0_ where customer0_.customer_id=?

:

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "my_customer_table")
public class Customer {

    @Id
    private String customer_id;
    private String first_name;
    private String last_name;

    protected Customer() {}


    public Customer(String firstName, String lastName) {
        this.first_name = firstName;
        this.last_name = lastName;
    }

    @Override
    public String toString() {
        return String.format(
                "Customer[id=%s, firstName='%s', lastName='%s']",
                customer_id, first_name, last_name);
    }
}

CustomerRepository

import com.....Customer;
import org.springframework.data.repository.CrudRepository;

public interface CustomerRepository extends CrudRepository<Customer, String> {
}

@Service, CustomerRepository @Autowired :

Customer customer = customerRepository.findOne(customerId);