Set connection pool and overflow limits when using HikariCP

Configure the connection pool size and overflow when connecting to Cloud SQL for MySQL by using the HikariCP JDBC connection pool library.

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For detailed documentation that includes this code sample, see the following:

Code sample

Java

To authenticate to Cloud SQL for MySQL, set up Application Default Credentials. For more information, see Set up authentication for a local development environment. 

// maximumPoolSize limits the total number of concurrent connections this pool will keep. Ideal
// values for this setting are highly variable on app design, infrastructure, and database.
config.setMaximumPoolSize(5);
// minimumIdle is the minimum number of idle connections Hikari maintains in the pool.
// Additional connections will be established to meet this value unless the pool is full.
config.setMinimumIdle(5);

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