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Tag Archives: MySQL

Docker MySQL Persistence

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One of the recipes in 9 Docker recipes for Java developers  is using MySQL container with WildFly. Docker containers are ephemeral, and so any state stored in them is gone after they are terminated and removed. So even though MySQL container can be used as explained in the recipe, DDL/DML commands can be used to persist data, but that state is lost, or at least not ...

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MySQL as Kubernetes Service, Access from WildFly Pod

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Java EE 7 and WildFly on Kubernetes using Vagrant (Tech Tip #71) explained how to run a trivial Java EE 7 application on WildFly hosted using Kubernetes and Docker. The Java EE 7 application was the hands-on lab that have been delivered around the world. It uses an in-memory database that is bundled with WildFly and allows to understand the ...

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OpenShift v3: Getting Started with Java EE 7 using WildFly and MySQL

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OpenShift is Red Hat’s open source PaaS platform. OpenShift v3 (due to be released this year) will provide a holistic experience on running your microservices using Docker and Kubernetes. In a classic Red Hat way, all the work is done in the open source at OpenShift Origin. This will also drive the next major release of OpenShift Online and OpenShift ...

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JDBC Tutorial – The ULTIMATE Guide

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This tutorial is about JDBC (Java Database Connectivity), an API provided by Oracle that allows programmers to handle different databases from Java applications: it allows developers to establish connections to databases, defines how a specific client can access a given database, provides mechanisms for reading, inserting, updating and deleting entries of data in a database and takes care of transactions ...

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Use MySQL’s Strict Mode on all new Projects!

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MySQL is a database that has been bending the SQL standard in ways that make it hard to move off MySQL. What may appear to be a clever technique for vendor lockin (or maybe just oversight of the standard) can be quite annoying in understanding the real meaning of the SQL language. One such example is MySQL’s interpretation of how ...

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Don’t Migrate to MariaDB just yet. MySQL is Back!

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Now that I have your attention, I’d like to invite you to a critical review of where we’re at in the MySQL vs. MariaDB debate. Around one month ago, I visited Oracle Open World 2014, and I’ve met with Morgan Tocker, the MySQL community manager at Oracle to learn about where MySQL is heading. Who “is” MySQL An interesting learning ...

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MySQL error: Can’t connect to MySQL server

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You may have stumbled on this MySQL error. If you have already seen this before, then it’s really easy to recognize this and fix it. But if you haven’t seen this error before, then it takes a little longer to troubleshoot the issue. I am listing down the steps to troubleshoot this issue.               ...

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MySQL Transaction Isolation Levels and Locks

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Recently, an application that my team was working on encountered problems with a MySQL deadlock situation and it took us some time to figure out the reasons behind it. This application that we deployed was running on a 2-node cluster and they both are connected to an AWS MySQL database. The MySQL db tables are mostly based on InnoDB which ...

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