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如何衡量Hibernate性能？

hibernatejprofilerperformance
9

如何测量Hibernate的性能？我想知道Hibernate执行查询所需的时间。

4个回答
11
7

当我使用Spring Hibernate进行开发时，通常在我的application.properties文件中使用以下属性来查看查询执行时间以及查询的执行方式：

spring.jpa.properties.hibernate.show_sql=true
spring.jpa.properties.hibernate.use_sql_comments=true
spring.jpa.properties.hibernate.format_sql=true
spring.jpa.properties.hibernate.generate_statistics=true

示例日志输出如下所示：

Hibernate: 
select
    order0_.OrderID as OrderID1_4_0_,
    order0_.customerID as customer2_4_0_,
    order0_.employeeID as employee3_4_0_,
    order0_.freight as freight4_4_0_,
    order0_.orderDate as orderDat5_4_0_,
    order0_.requiredDate as required6_4_0_,
    order0_.shipAddress as shipAddr7_4_0_,
    order0_.shipCity as shipCity8_4_0_,
    order0_.shipCountry as shipCoun9_4_0_,
    order0_.shipName as shipNam10_4_0_,
    order0_.shipPostalCode as shipPos11_4_0_,
    order0_.shipRegion as shipReg12_4_0_,
    order0_.shipVia as shipVia13_4_0_,
    order0_.shippedDate as shipped14_4_0_,
    customer1_.customerID as customer1_2_1_,
    customer1_.address as address2_2_1_,
    customer1_.city as city3_2_1_,
    customer1_.companyName as companyN4_2_1_,
    customer1_.contactName as contactN5_2_1_,
    customer1_.contactTitle as contactT6_2_1_,
    customer1_.country as country7_2_1_,
    customer1_.fax as fax8_2_1_,
    customer1_.phone as phone9_2_1_,
    customer1_.postalCode as postalC10_2_1_,
    customer1_.region as region11_2_1_ 
from
    orders order0_ 
left outer join
    customers customer1_ 
        on order0_.customerID=customer1_.customerID 
where
    order0_.OrderID=?
Hibernate: 
select
    orderdetai0_.OrderID as OrderID6_3_0_,
    orderdetai0_.ID as ID1_3_0_,
    orderdetai0_.ID as ID1_3_1_,
    orderdetai0_.discount as discount2_3_1_,
    orderdetai0_.OrderID as OrderID6_3_1_,
    orderdetai0_.productID as productI3_3_1_,
    orderdetai0_.quantity as quantity4_3_1_,
    orderdetai0_.unitPrice as unitPric5_3_1_ 
from
    order_details orderdetai0_ 
where
    orderdetai0_.OrderID=?

Session Metrics {
281879 nanoseconds spent acquiring 1 JDBC connections;
0 nanoseconds spent releasing 0 JDBC connections;
276015 nanoseconds spent preparing 2 JDBC statements;
1702274 nanoseconds spent executing 2 JDBC statements;
0 nanoseconds spent executing 0 JDBC batches;
0 nanoseconds spent performing 0 L2C puts;
0 nanoseconds spent performing 0 L2C hits;
0 nanoseconds spent performing 0 L2C misses;
0 nanoseconds spent executing 0 flushes (flushing a total of 0 entities and 0 collections);
0 nanoseconds spent executing 0 partial-flushes (flushing a total of 0 entities and 0 collections)}
5
1

你是指查询本身还是查询加上将数据转换为Java对象的过程？

无论哪种方式，如果你想要科学地进行性能分析，使用像JProbe这样的性能分析工具可能是最好的选择。你不一定需要花钱，Eclipse中也有一些免费的工具。

在最简单的情况下，只需在相关代码周围添加几个打印语句就足够了，如果你要测量的是主要处理过程。

进行彻底的性能分析需要非常小心。通常情况下，你需要运行多次测试以确保你不会被初始开销（如打开与数据库的连接）所误导。而且不要忘记，数据库和性能很可能是关键因素，Hibernate本身对于调整不良的数据库无能为力。

感谢您的回复。您是否有任何特定的免费工具或Eclipse插件，用于对Hibernate进行性能分析？ - kandarp
我在谷歌上搜索时看到了http://www.eclipse.org/tptp/，虽然我自己从未使用过它，但肯定值得一试。 - djna
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