Configure the connection pool size and overflow when connecting to Cloud SQL for PostgreSQL by using the HikariCP JDBC connection pool library.
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// 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);