Vlad Mihalcea

20 years of Hibernate

Imagine having a tool that can automatically detect JPA and Hibernate performance issues. Hypersistence Optimizer is that tool!

Introduction

20 years of Hibernate and counting.

On the 23rd of May 2001, Gavin King launched the first version of Hibernate. Twenty years later, Hibernate is one the most successful Java data access frameworks, having millions of developers using it on a per-daily basis.

20 years of Hibernate

Read More

JPA Entity Graph

Imagine having a tool that can automatically detect JPA and Hibernate performance issues. Hypersistence Optimizer is that tool!

Introduction

In this article, I’m going to explain how you can fetch an entity association using a JPA Entity Graph and how you can build it either declaratively or programmatically.

Read More

SQL Server Foreign Key Locking

Imagine having a tool that can automatically detect JPA and Hibernate performance issues. Hypersistence Optimizer is that tool!

Introduction

In this article, we are going to see how SQL Server Foreign Key constraints are locking the parent record when executing a child record UPDATE.

This situation is specific to SQL Server and happens even when using the Read Committed Snapshot Isolation level.

Read More

High-Performance Java Persistence Newsletter, Issue 26

Imagine having a tool that can automatically detect JPA and Hibernate performance issues. Hypersistence Optimizer is that tool!

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.

Read More

How to index JSON columns using MySQL

Imagine having a tool that can automatically detect JPA and Hibernate performance issues. Hypersistence Optimizer is that tool!

Introduction

In this article, I’m going to explain how we can index JSON columns when using MySQL.

While other relational database systems provide GIN (Generalized Inverted Index) indexes, MySQL allows you to index a virtual column that mirrors the JSON path expression you are interested in indexing.

Read More

Clustered Index

Imagine having a tool that can automatically detect JPA and Hibernate performance issues. Hypersistence Optimizer is that tool!

Introduction

In this article, we are going to see what a Clustered Index is and why it’s very important to understand how tables are organized when using a relational database system.

Read More

SQL Server JDBC – Set sendStringParametersAsUnicode to false

Imagine having a tool that can automatically detect JPA and Hibernate performance issues. Hypersistence Optimizer is that tool!

Introduction

In this article, I’m going to explain why you should always disable the sendStringParametersAsUnicode default JDBC Driver setting when using SQL Server.

Read More

High-Performance Java Persistence Newsletter, Issue 25

Imagine having a tool that can automatically detect JPA and Hibernate performance issues. Hypersistence Optimizer is that tool!

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.

Read More

SQL Server deadlock trace flags

Imagine having a tool that can automatically detect JPA and Hibernate performance issues. Hypersistence Optimizer is that tool!

Introduction

In this article, I’m going to explain how you can find the cause of an SQL Server deadlock using trace flags and the SQL error log.

As a rule of thumb, the more locks are acquired, the higher the probability of a deadlock. And, since SQL Server uses 2PL by default, it’s not uncommon to have to track deadlock issues that affect application performance.

Read More

Optimistic vs. Pessimistic Locking

Imagine having a tool that can automatically detect JPA and Hibernate performance issues. Hypersistence Optimizer is that tool!

Introduction

In this article, I’m going to explain what is the difference between optimistic and pessimistic locking, as well as when you should employ one or the other concurrency control strategies.

Read More

4 day training with a Java Champion 🏆 29th Nov - 2nd Dec