Hi! My name is Vlad Mihalcea, and I’m a Java Champion. I wrote the High-Performance Java Persistence book, which became one of the best-selling Java books on Amazon.I'm currently developing the amazing Hypersistence Optimizer, and in my free time, I develop various open-source projects (e.g. Hypersistence Utils and FlexyPool) and answer questions on StackOverflow. BlogI've been blogging since 2013 about Java, JPA, Hibernate, Spring, SQL, and database systems (e.g., Oracle, SQL Server, ...| Vlad Mihalcea
Introduction In this article, we are going to see why there is no benefit in using the Set collection type when mapping a bidirectional JPA OneToMany association. While the @OneToMany annotation can be used to map both unidirectional and bidirectional associations, as I explained this article, you should avoid the unidirectional mapping since it can lead to very inefficient SQL statements. Domain Model The goal of the bidirectional JPA OneToMany association is to map the one-to-many table rel...| Vlad Mihalcea
Introduction In this article, we are going to analyze how the JTA transaction type works. Since this is the default transaction type when using Jakarta EE or Java EE applications, it’s very important to understand how JTA transactions work, especially since Spring Boot or Spring applications use RESOURCE_LOCAL transactions instead. JTA Transaction Type When using the JTA transaction type, you can operate modifications across multiple data sources in an atomic global transaction that either ...| Vlad Mihalcea
Introduction In this article, we are going to see the best way to determine the optimal connection pool size using the FlexyPool auto-incrementing pool strategy. If you are unfamiliar with the reason why database applications need a connection pool, then check out this article first. Now, according to the Universal Scalability Law, the maximum throughput of a database system is achieved for a limited number of database connections. If we increase the number of connections above that particula...| Vlad Mihalcea
Introduction Welcome to a new issue of the High-Performance Java Persistence Newsletter in which we share articles, videos, workshops, and StackOverflow answers that are very relevant to any developer who interacts with a database system using Java. Articles The pick of this week is this article about data alignment in PostgreSQL tables and indexes. By properly designing your tables and indexes, you can end up saving 10 or 20% of disk and in-memory space. Another good read was this series of ...| Vlad Mihalcea
By scanning your application configuration, Hypersistence Optimizer can tell you what changes you need to make to speed up your application.| Vlad Mihalcea
