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 various online schema migration options that are available in MySQL. Another great read was this one about scaling the One Million Checkboxes website. There are many lessons you can learn from this experiment. One lesson is about the cost of running a high-traffic website. Using... Read More

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Introduction In this article, we are going to see how we can batch INSERT statements when using MySQL and Hibernate. While Hibernate has long supported automated JDBC batch inserts, this feature doesn’t work when using the IDENTITY identifier generator strategy. Unfortunately, MySQL doesn’t support SEQUENCE objects, so using IDENTITY is the only reasonable option. Therefore, I’m going to show you a technique you can use to get Hibernate batch INSERT statements for entities that use the IDENTITY generator. Default batch INSERT with MySQL and Hibernate Let’s say we have created the following... Read More

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Introduction In this article, I’m going to show you the RevoGain software architecture. RevoGain is a web application that helps Revolut users calculate their stocks and crypto trading gains, and I started building it at the beginning of September 2021. Hype vs. Reality Have you ever been to a software conference and felt disconnected from all those hyped technologies that were presented so beautifully on stage? I certainly had. Whenever I came back from a software conference and looked at my project codebase, I could see a large gap between what’s being... Read More

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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 From version 2.12, Percona PMM uses Victoria Metrics instead of Prometheus. Victoria Metrics provides better disk I/0 utilization and less memory usage. For more details about this change and its benefits, check out this article. By default, the MySQL JDBC Driver only emulates prepared statements. If you wonder whether server-side prepared statements perform better... Read More

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Quarkus is a supersonic Java framework built with a cloud-native first mentality. It’s blazing fast in startup and has a much smaller memory footprint compared to Spring Boot. Quarkus is [...]

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Introduction Welcome to a new issue of the Java and Database newsletter in which we share articles, announcements, and StackOverflow answers that are very relevant to any developer who interacts with a database system from Java. Articles Since version 13, Java now supports multiline string literals via the Text Blocks feature. To see how much more readable are SQL or JPQL queries, JSON, HTML, and XML string literals when using Text Blocks, then you should definitely read this article, When writing SQL queries with the NOT IN query expression, you need to... Read More

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Introduction While developing a Spring Boot application is rather easy, tuning the performance of a Spring Boot application is a more challenging task, as, not only it requires you to understand how the Spring framework works behind the scenes, but you have to know what is the best way to use the underlying data access framework, like Hibernate for instance. In a previous article, I showed you how easily to optimize the performance of the Petclinic demo application. However, by default, the Petclinic Spring Boot application uses the in-memory HSQLDB database, which... Read More

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Introduction In this article, we are going to test the MySQL 8 implementation of custom SQL CHECK constraints. Although the CHECK clause is a standard SQL feature, prior to MySQL 8.0.16, the clause was parsed and ignored, so this functionality could only be emulated via BEFORE INSERT and UPDATE triggers. Custom SQL CHECK constraints As I explained in this article, custom SQL CHECK constraints are very useful to ensure non-nullability constraints for JPA entity subclass-specific attributes when using the SINGLE TABLE JPA inheritance strategy. To understand the problem, consider we have the... Read More

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Introduction As I explained in this article, multitenancy is an architectural pattern which allows you to isolate customers even if they are using the same hardware or software components. There are multiple ways you can achieve multitenancy, and in this article, we are going to see how you can implement a multitenancy architecture using the … Continue reading Hibernate database catalog multitenancy →

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Introduction When executing an entity query (e.g. JPQL, HQL or Criteria API), you can use any SQL function without having to register it as long as the function is passed directly to the WHERE clause of the underlying SQL statement. However, if the SQL function is used in the SELECT clause, and Hibernate has not … Continue reading The best way to use SQL functions in JPQL or Criteria API queries with JPA and Hibernate →

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