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Minimize MySQL Deadlocks with 3 Steps

 | September 24, 2018 |  Posted In: Entry Level, MySQL

application deadlock in MySQL transactions

MySQL has locking capabilities, for example table and row level locking, and such locks are needed to control data integrity in multi-user concurrency. Deadlocks—where two or more transactions are waiting for one another to give up locks before the transactions can proceed successfully—are an unwanted situation. It is a classic problem for all databases including […]

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7 Checks to Successfully Upgrade MongoDB Replica Set in Production

 | August 29, 2018 |  Posted In: MongoDB, Open Source Databases

checklist for the upgrade of MongoDB replica set

MongoDB ships powerful features in each release. The new release brings new features while revisions add bug fixes, security patches or improvements to existing features. To bring most out these releases to your plate you should always consider upgrading your MongoDB deployments. Planning your database upgrade can avoid the nightmares caused due to database-upgrade-gone-wrong or avoid not-so-simple rollbacks in your production […]

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Question about Semi-Synchronous Replication: the Answer with All the Details

 | August 23, 2018 |  Posted In: MariaDB, MySQL

semi-sync replication MySQL

I was recently asked a question by mail about MySQL Lossless Semi-Synchronous Replication. As I think the answer could benefit many people, I am answering it in a blog post. The answer brings us to the internals of transaction committing, of semi-synchronous replication, of MySQL (server) crash recovery, and of storage engine (InnoDB) crash recovery. […]

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Easy and Effective Way of Building External Dictionaries for ClickHouse with Pentaho Data Integration Tool

 | August 2, 2018 |  Posted In: MySQL, Open Source Databases

pentaho pdt with clickhouse

In this post, I provide an illustration of how to use Pentaho Data Integration (PDI) tool to set up external dictionaries in MySQL to support ClickHouse. Although I use MySQL in this example, you can use any PDI supported source. ClickHouse ClickHouse is an open-source column-oriented DBMS (columnar database management system) for online analytical processing. […]

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