A Thorough Comparison of Completely Free, Always-On Database Services (2026 Edition)

Switching DB Read/Write Endpoints with ProxySQL

Building a Thread-Safe Access Count Ranking with Rails × Redis

Building Rails 5 (Puma) + Nginx + MySQL with docker-compose on Vagrant (Ubuntu)

Building a Rails 5.1.0 (Puma) + Nginx + MySQL Environment with Vagrant + docker-compose

Aggregating Data in MySQL with COUNT, SUM, GROUP BY, and CASE WHEN THEN

Detecting Slow Queries, Analyzing Them with EXPLAIN, and Notifying Slack

Checking Table-Level Size in MySQL

Troubleshooting MySQL Crashes: Cannot allocate memory for the buffer pool

Exporting MySQL SQL Results to CSV Without Using INTO OUTFILE

MySQL Troubleshooting - mysqldump: Couldn't execute 'FLUSH TABLES': Access denied; you need (at least one of) the RELOAD privilege(s) for this operation (1227)

MySQL Troubleshooting - ERROR 1045 (28000): Access denied for user 'root'@'localhost' (using password: NO)

MySQL Troubleshooting - ERROR 2006 (HY000) at line ***: MySQL server has gone away

Redis - Dealing with (error) NOAUTH Authentication required

Bulk-deleting Unneeded Indices with Elasticsearch curator

Elasticsearch Index List, Mapping List, and Mapping Configuration

Installing Elasticsearch on CentOS 7

Installing MySQL 5.6 on CentOS 7

MySQL Command Cheat Sheet

Installing and Running mysqldiff on CentOS

Installing httpd, MySQL, and PHP from source with Vagrant + Ansible and verifying startup

Installing Redis on CentOS 7

MySQL vs PostgreSQL Command Comparison

Installing and Using phpMyAdmin on CentOS

Installing Memcache on MAMP and Running It with PHP

Installing Redis on Sakura VPS CentOS 6.5 and Running It from PHP