问题描述
我试图在5秒钟内使用Hibernate(JPA)在MYSQL表中插入100,000行.我已经尝试了冬眠提供的所有技巧，但仍然不能超过35秒.
I am trying to insert 100,000 rows in a MYSQL table under 5 seconds using Hibernate(JPA). I have tried every trick hibernate offers and still can not do better than 35 seconds.
第一次优化:我从IDENTITY序列生成器开始，这导致60秒的插入时间.后来我放弃了序列生成器，开始自己读取MAX(id)并使用AtomicInteger.incrementAndGet()自己分配字段，从而自己分配了@Id字段.这样将插入时间减少到35秒.
1st optimisation : I started with IDENTITY sequence generator which was resulting in 60 seconds to insert. I later abandoned the sequence generator and started assigning the @Id field myself by reading the MAX(id) and using AtomicInteger.incrementAndGet() to assign fields myself. That reduced the insert time to 35 seconds.
第二次优化:我通过添加
2nd optimisation : I enabled batch inserts, by adding
<prop key="hibernate.jdbc.batch_size">30</prop><prop key="hibernate.order_inserts">true</prop><prop key="hibernate.current_session_context_class">thread</prop><prop key="hibernate.jdbc.batch_versioned_data">true</prop>
<prop key="hibernate.jdbc.batch_size">30</prop><prop key="hibernate.order_inserts">true</prop><prop key="hibernate.current_session_context_class">thread</prop><prop key="hibernate.jdbc.batch_versioned_data">true</prop>
进行配置.令我震惊的是，批量插入对于减少插入时间没有任何作用.仍然是35秒！
to the configuration. I was shocked to find that batch inserts did absolutely nothing to decrease insert time. It was still 35 seconds!
现在，我正在考虑尝试使用多个线程进行插入.有人有指针吗?我应该选择MongoDB吗?
Now, I am thinking about trying to insert using multiple threads.Anyone has any pointers? Should I have chosen MongoDB?
以下是我的配置:1.休眠配置`
Below is my configuration:1. Hibernate configuration`
<bean id="entityManagerFactoryBean" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="packagesToScan" value="com.progresssoft.manishkr" />
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter" />
</property>
<property name="jpaProperties">
<props>
<prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop>
<prop key="hibernate.dialect">${hibernate.dialect}</prop>
<prop key="hibernate.show_sql">${hibernate.show_sql}</prop>
<prop key="hibernate.format_sql">${hibernate.format_sql}</prop>
<prop key="hibernate.jdbc.batch_size">30</prop>
<prop key="hibernate.order_inserts">true</prop>
<prop key="hibernate.current_session_context_class">thread</prop>
<prop key="hibernate.jdbc.batch_versioned_data">true</prop>
</props>
</property>
</bean>
<bean class="org.springframework.jdbc.datasource.DriverManagerDataSource"
id="dataSource">
<property name="driverClassName" value="${database.driver}"></property>
<property name="url" value="${database.url}"></property>
<property name="username" value="${database.username}"></property>
<property name="password" value="${database.password}"></property>
</bean>
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory" ref="entityManagerFactoryBean" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager" />
`
- 实体配置:
`
@Entity
@Table(name = "myEntity")
public class MyEntity {
@Id
private Integer id;
@Column(name = "deal_id")
private String dealId;
....
....
@Temporal(TemporalType.TIMESTAMP)
@Column(name = "timestamp")
private Date timestamp;
@Column(name = "amount")
private BigDecimal amount;
@OneToOne(cascade = CascadeType.ALL)
@JoinColumn(name = "source_file")
private MyFile sourceFile;
public Deal(Integer id,String dealId, ....., Timestamp timestamp, BigDecimal amount, SourceFile sourceFile) {
this.id = id;
this.dealId = dealId;
...
...
...
this.amount = amount;
this.sourceFile = sourceFile;
}
public String getDealId() {
return dealId;
}
public void setDealId(String dealId) {
this.dealId = dealId;
}
...
...
....
public BigDecimal getAmount() {
return amount;
}
public void setAmount(BigDecimal amount) {
this.amount = amount;
}
....
public Integer getId() {
return id;
}
public void setId(Integer id) {
this.id = id;
}
`
- 永久代码(服务):
`
@Service
@Transactional
public class ServiceImpl implements MyService{
@Autowired
private MyDao dao;
....
`void foo(){
for(MyObject d : listOfObjects_100000){
dao.persist(d);
}
}
`4.道课:
`
@Repository
public class DaoImpl implements MyDao{
@PersistenceContext
private EntityManager em;
public void persist(Deal deal){
em.persist(deal);
}
}
`
日志:`
DEBUG o.h.e.j.b.internal.AbstractBatchImpl - Reusing batch statement
18:26:32.906 [http-nio-8080-exec-2] DEBUG org.hibernate.SQL - insert into deal (amount, deal_id, timestamp, from_currency, source_file, to_currency, id) values (?, ?, ?, ?, ?, ?, ?)
18:26:32.906 [http-nio-8080-exec-2] DEBUG o.h.e.j.b.internal.AbstractBatchImpl - Reusing batch statement
18:26:32.906 [http-nio-8080-exec-2] DEBUG org.hibernate.SQL - insert into deal (amount, deal_id, timestamp, from_currency, source_file, to_currency, id) values (?, ?, ?, ?, ?, ?, ?)
18:26:32.906 [http-nio-8080-exec-2] DEBUG o.h.e.j.b.internal.AbstractBatchImpl - Reusing batch statement
18:26:32.906 [http-nio-8080-exec-2] DEBUG org.hibernate.SQL - insert into deal (amount, deal_id, timestamp, from_currency, source_file, to_currency, id) values (?, ?, ?, ?, ?, ?, ?)
18:26:32.906 [http-nio-8080-exec-2] DEBUG o.h.e.j.b.internal.AbstractBatchImpl - Reusing batch statement
18:26:32.906 [http-nio-8080-exec-2] DEBUG org.hibernate.SQL - insert into deal (amount, deal_id, timestamp, from_currency, source_file, to_currency, id) values (?, ?, ?, ?, ?, ?, ?)
18:26:32.906 [http-nio-8080-exec-2] DEBUG o.h.e.j.b.internal.AbstractBatchImpl - Reusing batch statement
18:26:32.906 [http-nio-8080-exec-2] DEBUG org.hibernate.SQL - insert into deal (amount, deal_id, timestamp, from_currency, source_file, to_currency, id) values (?, ?, ?, ?, ?, ?, ?)
18:26:32.906 [http-nio-8080-exec-2]
......
DEBUG o.h.e.j.b.internal.AbstractBatchImpl - Reusing batch statement
18:26:34.002 [http-nio-8080-exec-2] DEBUG org.hibernate.SQL - insert into deal (amount, deal_id, timestamp, from_currency, source_file, to_currency, id) values (?, ?, ?, ?, ?, ?, ?)
18:26:34.002 [http-nio-8080-exec-2] DEBUG o.h.e.j.b.internal.AbstractBatchImpl - Reusing batch statement
18:26:34.002 [http-nio-8080-exec-2] DEBUG org.hibernate.SQL - insert into deal (amount, deal_id, timestamp, from_currency, source_file, to_currency, id) values (?, ?, ?, ?, ?, ?, ?)
18:26:34.002 [http-nio-8080-exec-2] DEBUG o.h.e.j.b.internal.AbstractBatchImpl - Reusing batch statement
18:26:34.002 [http-nio-8080-exec-2] DEBUG org.hibernate.SQL - insert into deal (amount, deal_id, timestamp, from_currency, source_file, to_currency, id) values (?, ?, ?, ?, ?, ?, ?)
18:26:34.002 [http-nio-8080-exec-2] DEBUG o.h.e.j.b.internal.AbstractBatchImpl - Reusing batch statement
18:26:34.002 [http-nio-8080-exec-2] DEBUG org.hibernate.SQL - insert into deal (amount, deal_id, timestamp, from_currency, source_file, to_currency, id) values (?, ?, ?, ?, ?, ?, ?)
18:26:34.002 [http-nio-8080-exec-2] DEBUG o.h.e.j.batch.internal.BatchingBatch - Executing batch size: 27
18:26:34.011 [http-nio-8080-exec-2] DEBUG org.hibernate.SQL - update deal_source_file set invalid_rows=?, source_file=?, valid_rows=? where id=?
18:26:34.015 [http-nio-8080-exec-2] DEBUG o.h.e.j.batch.internal.BatchingBatch - Executing batch size: 1
18:26:34.018 [http-nio-8080-exec-2] DEBUG o.h.e.t.i.jdbc.JdbcTransaction - committed JDBC Connection
18:26:34.018 [http-nio-8080-exec-2] DEBUG o.h.e.t.i.jdbc.JdbcTransaction - re-enabling autocommit
18:26:34.032 [http-nio-8080-exec-2] DEBUG o.s.orm.jpa.JpaTransactionManager - Closing JPA EntityManager [org.hibernate.jpa.internal.EntityManagerImpl@2354fb09] after transaction
18:26:34.032 [http-nio-8080-exec-2] DEBUG o.s.o.jpa.EntityManagerFactoryUtils - Closing JPA EntityManager
18:26:34.032 [http-nio-8080-exec-2] DEBUG o.h.e.j.internal.JdbcCoordinatorImpl - HHH000420: Closing un-released batch
18:26:34.032 [http-nio-8080-exec-2] DEBUG o.h.e.j.i.LogicalConnectionImpl - Releasing JDBC connection
18:26:34.033 [http-nio-8080-exec-2] DEBUG o.h.e.j.i.LogicalConnectionImpl - Released JDBC connection
'
推荐答案
尝试了所有可能的解决方案之后，我终于找到了一种在5秒内插入100,000行的解决方案！
After trying all possible solutions I finally found a solution to insert 100,000 rows under 5 seconds!
我尝试过的事情:
1)使用AtomicInteger用自己生成的ID替换了休眠/数据库的AUTOINCREMENT/GENERATED ID.
1) Replaced hibernate/database's AUTOINCREMENT/GENERATED id's by self generated ID's using AtomicInteger
2)启用batch_size = 50的batch_inserts
2) Enabling batch_inserts with batch_size=50
3)在每"batch_size"个persist()调用之后刷新缓存
3) Flushing cache after every 'batch_size' number of persist() calls
4)多线程(未尝试过此操作)
4) multithreading (did not attempt this one)
最后，有效的方法是使用本地多插入查询，并在一个sql插入查询中插入1000行，而不是在每个实体上使用 persist().为了插入100,000个实体，我创建了一个本地查询，例如"INSERT into MyTable VALUES (x,x,x),(x,x,x).......(x,x,x)" [在一个sql插入查询中插入1000行]
Finally what worked was using a native multi-insert query and inserting 1000 rows in one sql insert query instead of using persist() on every entity. For inserting 100,000 entities, I create a native query like this "INSERT into MyTable VALUES (x,x,x),(x,x,x).......(x,x,x)" [1000 row inserts in one sql insert query]
现在，插入100,000条记录大约需要3秒钟！因此瓶颈是orm本身！对于批量插入，似乎唯一起作用的是本机插入查询！
Now it takes around 3 seconds for inserting 100,000 records! So the bottleneck was the orm itself! For bulk inserts, the only thing that seems to work is native insert queries!
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