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what's the best setting for basicdatasource in production environment


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When configuring BasicDataSource (from Apache Commons DBCP) for a production environment, it's crucial to focus on settings that ensure stability, performance, and efficient resource utilization. Here are some recommended configurations:

Essential Configuration Parameters
Driver Class Name and Connection URL

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ds.setDriverClassName("com.mysql.cj.jdbc.Driver");
ds.setUrl("jdbc:mysql://hostname:port/database");
ds.setUsername("yourUsername");
ds.setPassword("yourPassword");
Initial Size

Initial number of connections created when the pool is started.
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ds.setInitialSize(10);
Maximum Active Connections (maxTotal)

Maximum number of active connections that can be allocated from this pool at the same time.
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ds.setMaxTotal(100);
Maximum Idle Connections (maxIdle)

Maximum number of connections that can sit idle in the pool.
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ds.setMaxIdle(30);
Minimum Idle Connections (minIdle)

Minimum number of connections that can sit idle in the pool without extra ones being created.
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ds.setMinIdle(10);
Max Wait Time for Connection (maxWaitMillis)

Maximum time to wait for a connection to be returned before throwing an exception.
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ds.setMaxWaitMillis(10000); // 10 seconds
Performance and Reliability Enhancements
Connection Validation

Ensure that the connections returned from the pool are valid.
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ds.setValidationQuery("SELECT 1");
ds.setTestOnBorrow(true);
ds.setTestOnReturn(false);
ds.setTestWhileIdle(true);
Idle Connection Validation Interval

How frequently to validate idle connections in the pool.
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ds.setTimeBetweenEvictionRunsMillis(5000); // 5 seconds
Minimum Time a Connection May Sit Idle Before It Is Eligible for Eviction (minEvictableIdleTimeMillis)

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ds.setMinEvictableIdleTimeMillis(60000); // 1 minute
Log Abandoned Connections

Log a stack trace of the code that abandoned a connection to assist with debugging.
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ds.setLogAbandoned(true);
ds.setRemoveAbandonedOnBorrow(true);
ds.setRemoveAbandonedOnMaintenance(true);
ds.setRemoveAbandonedTimeout(300); // 5 minutes
Example Configuration
Here is an example of how you might configure a BasicDataSource:

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BasicDataSource ds = new BasicDataSource();

ds.setDriverClassName("com.mysql.cj.jdbc.Driver");
ds.setUrl("jdbc:mysql://hostname:port/database");
ds.setUsername("yourUsername");
ds.setPassword("yourPassword");

ds.setInitialSize(10);
ds.setMaxTotal(100);
ds.setMaxIdle(30);
ds.setMinIdle(10);
ds.setMaxWaitMillis(10000);

ds.setValidationQuery("SELECT 1");
ds.setTestOnBorrow(true);
ds.setTestOnReturn(false);
ds.setTestWhileIdle(true);

ds.setTimeBetweenEvictionRunsMillis(5000);
ds.setMinEvictableIdleTimeMillis(60000);

ds.setLogAbandoned(true);
ds.setRemoveAbandonedOnBorrow(true);
ds.setRemoveAbandonedOnMaintenance(true);
ds.setRemoveAbandonedTimeout(300);
Additional Considerations
Monitoring: Integrate with monitoring tools to keep an eye on the performance and behavior of your connection pool.
Timeouts: Set appropriate timeouts to avoid potential hanging connections.
Security: Ensure that credentials are managed securely and that your database is properly secured against unauthorized access.
Scalability: Regularly review and adjust the connection pool settings based on the load and usage patterns.
Testing and Optimization
Before deploying to production, thoroughly test your configuration under load to ensure it meets your application's requirements. Monitor its performance and make adjustments as necessary based on real-world usage.