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 edition is this article from Percona that presents the new pg_stat_monitor tool they developed to simplify PostgreSQL performance monitoring.

The pg_stat_monitor builds on top of the existing pg_stat_statement PostgreSQL extension and aggregates query calls into time windows, called buckets. This allows you to capture the performance statistics during traffic spikes, which would be difficult to trace with the standard pg_stat_statement tool since it levels up short-term spikes.

When navigating large result sets using pagination, the default SQL Offset pagination is not very suitable for seeking through an associate B+Tree index. Therefore, the Keyset Pagination technique aims to fix this problem and provide a much more efficient implementation. For more details about this technique, check out this article.

If you are using PostgreSQL and want to set up a Multi-Primary replication scheme, then this article evaluates several options you could use.

If you used SQL Server and got used to the NEWSEQUENTIALID function that allows you to generate GUID numbers that follow a sequential pattern and want to achieve the same goal in PostgreSQL, then this sequential-uuids extension will surely help you.

If you are using JPA or Hibernate, then you should definitely use Blaze Persistence as well because it provides support for many features that are not present in JPA or Hibernate. To get an idea of its capabilities, check out this article which shows how you can use Blaze Persistence to build complex queries dynamically.

Percona PMM tool allows you to monitor and manage both MySQL and PostgreSQL database systems. To see how you can use PMM to track a performance problem, check out this article.

Best Tweets

Here are the best tweets I posted since the last newsletter:

Code reusability is what you get when you use a framework.

Overengineering is what get when you spend time and resources building an in-house framework no one wanted or needed.

— Vlad Mihalcea (@vlad_mihalcea) August 1, 2021

As software developers, we are very fortunate to be able to earn good money doing what we really enjoy.

— Vlad Mihalcea (@vlad_mihalcea) July 29, 2021

You don't need to know everything.

You just need to know where to find what you don't know.

— Vlad Mihalcea (@vlad_mihalcea) July 11, 2021

You don't need a large team to build an awesome software product.

A small team of motivated developers is all you need.

— Vlad Mihalcea (@vlad_mihalcea) July 28, 2021

When adding a library to your project, all the library problems become your problems as well.

— Vlad Mihalcea (@vlad_mihalcea) July 25, 2021

Project Releases

MySQL 8.0.26 has been released and provides many new features and bug fixes as well.

Hibernate ORM released two versions since the last newsletter episode:

• 5.5.5
• 5.5.4

The PostgreSQL JDBC Driver released two new versions:

• 42.2.23

The 2.12.1 version of the Hibernate Types project has been released and fixes one issue related to ZonedDateTime handling.

Get in touch with my latest articles!

SUBSCRIBE

StackOverflow Answers

The following StackOverflow answers have been trending over the past two weeks:

• How can we set the Read Uncommitted isolation level with JPA and Hibernate?
• Is it possible to limit the size of a @OneToMany collection with Hibernate or JPA Annotations?
• How to query with Spring JPA on jsonb columns?
• JPA orphan removal does not work for @OneToOne relations
• Hibernate: How to use a custom collection of @Embeddables?
• Spring JPA Many to Many with extra column not updating