spring - 在 SQL Server Profiler 中显示 - 查询执行需要 1 毫秒，但在 Spring 应用程序中需要 30 毫秒，延迟在哪里？

Question

我在 Azure SQL 数据库中创建了一个简单的表

CREATE TABLE DeleteMe(
    [ID] [int] NOT NULL,
    [LastName] [char](255) NOT NULL,
    [FirstName] [char](255) NOT NULL,
    [Age] [int] NOT NULL,
    [DOJ] [datetime2](0) NOT NULL,
    [Role] [varchar](255) NULL
) ON [PRIMARY]
GO
    
CREATE CLUSTERED INDEX [clusteredindexdeleteme] ON DeleteMe
(
    [ID] ASC,
    [LastName] ASC,
    [FirstName] ASC,
    [Age] ASC
)WITH (STATISTICS_NORECOMPUTE = OFF, DROP_EXISTING = OFF, ONLINE = OFF, OPTIMIZE_FOR_SEQUENTIAL_KEY = OFF) ON [PRIMARY]
GO

在 SQL Server Profiler 中显示 - 查询执行时间不到 1 毫秒

但在 Spring App 中需要 30ms

INFO : 01.05.2022:1754 (40.419) [[]main] HikariDataSource: springHikariCP - Starting...
INFO : 01.05.2022:1754 (41.941) [[]main] HikariDataSource: springHikariCP - Start completed.
Execution Started: 2022/01/05 17:54:41.948
INFO : 01.05.2022:1754 (41.950) [[]main] HikariDataSource: springHikariCP - Starting...
INFO : 01.05.2022:1754 (42.139) [[]main] HikariDataSource: springHikariCP - Start completed.
Select Query Execution Started: 2022/01/05 17:54:42.225
Select Query Execution Completed: 2022/01/05 17:54:42.251

Java 应用程序:

public class JDBCSample {

    public static void main(String[] args) {
        ...

        try {
            Connection conn = dataSource().getConnection();
            conn.setAutoCommit(false);

            Statement statement = conn.createStatement();

            ResultSet rs ;
            try {
                LocalDateTime executionStartTime = LocalDateTime.now();
                System.out.println("Select Query Execution Started: " + dtf.format(executionStartTime));
                
                rs = statement.executeQuery("SELECT ID from Delete Where ID = 50");

                executionEndTime = LocalDateTime.now();
                System.out.println("Select Query Execution Completed:  " + dtf.format(executionEndTime));
            }
            catch (SQLException ex)
            {
                System.out.println("Error message: " + ex.getMessage());
                return; // Exit if there was an error
            }

        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    @Bean(destroyMethod = "close")
    public static DataSource dataSource(){
        HikariConfig hikariConfig = new HikariConfig();
        hikariConfig.setDriverClassName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
        hikariConfig.setJdbcUrl("jdbc:sqlserver://....;encrypt=true;trustServerCertificate=false;");
        hikariConfig.setUsername("...");
        hikariConfig.setPassword("...");
        hikariConfig.setMaximumPoolSize(1);
        hikariConfig.setConnectionTestQuery("SELECT 1");
        hikariConfig.setPoolName("springHikariCP");

        HikariDataSource dataSource = new HikariDataSource(hikariConfig);
        
        return dataSource;
    }
}

注意:当我对安装在 Dev 笔记本电脑上的本地服务器执行相同的应用程序时，它只需要 6 毫秒。

注意:我正在从 Azure Kubernetes 执行此应用程序。

延迟在哪里？我该如何解决这个问题，以便 Spring 应用程序不会超过 2 毫秒。

Answer 1

根据您在此处分享的内容，我认为延迟是网络延迟。

将 Java 应用程序开发到开发服务器需要 6 秒。

Azure Kubernetes 应用到 Azure SQL 数据库需要 30 毫秒。如果您包括应用程序和服务器之间的网络延迟，我认为这是合理的。我不认为你会在 2 毫秒内得到结果。如果你明白了，请告诉我；)

尝试以某些方式检查网络延迟，例如在 SELECT 1 查询上执行并计算周转时间。

有趣的阅读:
https://azure.microsoft.com/en-in/blog/testing-client-latency-to-sql-azure/
https://learn.microsoft.com/en-us/archive/blogs/igorpag/azure-network-latency-sql-server-optimization
https://github.com/RicardoNiepel/azure-mysql-in-aks-sample There is a way to measure latency network in java