Are databases thread-safe?

Is a SQL database thread-safe?

To answer you question in simple word, yes it is.

Are databases multithreaded?

All Db2 database system applications are multithreaded by default, and are capable of using multiple contexts. You can use the following Db2 APIs to use multiple contexts.

Are databases single threaded?

SQL servers are designed to handle multiple connections but every entry in to the transaction log has to be handled sequentially. In short, many people can on multiple threads be connected to the server, but only 1 transaction can occur at any given point in time.

How do I make my database thread-safe?

public void createUser(int accountId) { String sql = "INSERT INTO users (user_id, is_primary) " + "SELECT 0, if(COUNT(*)=0, 'y', null) " + "FROM users"; //.... } So it will be safe to run your code in a multithreading environment, and you can get rid of getNumberOfAccountsUsers method.