About Vlad Mihalcea

Vlad Mihalcea is a software architect passionate about software integration, high scalability and concurrency challenges.

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The minimal configuration for testing Hibernate

Introduction In my previous post I announced my intention of creating a personal Hibernate course. The first thing to start with is a minimal testing configuration. The examples are ...
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The data knowledge stack

Concurrency is not for the faint-hearted We all know concurrency programming is difficult to get it right. That’s why threading tasks are followed by extensive design and code reviewing ...
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The simple scalability equation

Queueing Theory The queueing theory allows us to predict queue lengths and waiting times, which is of paramount importance for capacity planning. For an architect this is a very handy ...
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Time to break free from the SQL-92 mindset

Are you stuck in the 90s? If you are only using the SQL-92 language reference, then you are overlooking so many great features like:window functions MERGE TRUNCATE INSTEAD OF triggersSome ...
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How to import CSV data into PostgreSQL

Introduction Many database servers support CSV data transfers and this post will show one way you can import CSV files to PostgreSQL. SQL aggregation rocks! My previous post demonstrated ...
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Professional connection pool sizing

Introduction I previously wrote about the benefits of connection pooling and why monitoring it is of crucial importance. This post will demonstrate how Flexy Pool can assist you in ...
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Flexy Pool, reactive connection pooling

Introduction When I started working on enterprise projects we were using J2EE and the pooling data source was provided by the application server.Scaling up meant buying more powerful ...
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The anatomy of Connection Pooling

Introduction All projects I’ve been working on have used database connection pooling and that’s for very good reasons. Sometimes we might forget why we are employing one design ...
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Maven and Java multi-version modules

Introduction Usually, a project has a minimum Java version requirement and that applies to all of its modules. But every rule has its exceptions, as recently I stumbled on the following ...
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MongoDB 2.6 is out

Introduction MongoDB is evolving rapidly. The 2.2 version introduced the aggregation framework as an alternative to the Map-Reduce query model. Generating aggregated reports is a recurrent ...
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