Because they do NOT reflect your problems.

One of our customers upgraded last month from MariaDB 10.2 to MariaDB 10.5. In the same change he also converted all his data warehouse (DWH)/BI tables from MyISAM to Aria. An all this, naturally, without testing. And it miserably failed! And then we were under heavy time pressure to make things working again…

What has changed:

• MariaDB version: MariaDB optimizer got a lot of changes between these 4 major release series (10.2, 10.3, 10.4 and 10.5)!
• Storage …

When it comes to SQL Query tuning with customers we often get the slow running SQL query and possibly, in good cases, also the table structure. But very often, for various reasons, we do not get the data.

SQL query tuning on an empty table or a table with only little data is not really fun because either the results of the optimizer have nothing to do with reality or the response times do not really show if your change has improved anything. For example if your query response time before the change was 2 ms …

Due to a strong customer demand FromDual offers 2018 two extra MySQL/MariaDB trainings with its Training partner The Linuxhotel in Essen (Germany). Those trainings are in English.

• MariaDB Performance Tuning on 5 and 6 September 2018 (2 days).
• Advanced MySQL/MariaDB training on 26 to 30 November 2018 (5 days).

More information about the contents of the trainings can be found at

Advanced MySQL and MariaDB training.

For conditions and booking: MariaDB Performance Tuning and Advanced MySQL Training.

For …

MySQL single query performance - the truth!

As suggested by morgo I did a little test for the same query and the same data-set mentioned in Impact of column types on MySQL JOIN performance but looking into an other dimension: the time (aka MySQL versions).

The answer

To make it short. As a good consultant the answer must be: “It depends!” :-)

The test

The query was again the following:

SELECT *
  FROM a
  JOIN b ON b.a_id = a.id
 WHERE a.id BETWEEN 10000 AND 15000
;

The Query Execution Plan was …

You are already familiar with the MySQL or MariaDB and you are challenged to operate a serious MySQL database. If this is the case this training is the right one for you.

Requirements

You are familiar with the MySQL basics and have already some experience with MySQL or MariaDB operations. The SQL language does not look strange to you any more. Further you are familiar with the Linux console and rule the most important UNIX commands.

Audience

• MySQL application developer
• MySQL and MariaDB database …

Many of you may monitor their databases for different purposes. Beside alerting it is often good to also make some graphs from MySQL performance counters to see what is actually happening on your database.

The following graphs where made with our FromDual Performance Monitor for MySQL as a Service (MaaS) set-up. If you do not have the time to install a performance monitoring yourself please feel free to contact us for our MaaS solution.

Overview

First of all it is a good idea to have an overview of all the …

Im Admin-Magazin 2011/06 hat es einen netten Artikel über MySQL und PostgreSQL Performance Tuning: Duell der Datenbanken: In einem Shootout messen sich MySQL und PostgreSQL

Susanne hat dabei PostgreSQL, wir MySQL betreut…

Basic solutions (CLI)

Those solutions are run from the command line (CLI):

• top (man)
• vmstat (man)
• iostat (man), mpstat (man), pidstat in package sysstat
• mytop, a Mytop Introduction
• dstat
• free (man)
• procinfo (man)
• mpstat (man)
• mTop
• InnoTop

Advanced solutions

More advanced MySQL database and host monitoring solutions with graphs and/or history and/or hints are:

Table of Contents

• Database Benchmark
• General Benchmarking Tools
• CPU Benchmarking
• Disk benchmarking
• Network Benchmarking
  • Tools
• Application Stress Testing
  • OwnCloud / NextCloud
  • Asterisk

Database Benchmark

• sysbench (filesystems and OS/HW tests), Sysbench source, sysbench v0.5, sysbench scripts
• OSDL Database Test Suite (download)
• DBT2 (TPC-C, OLTP), DBT2 Benchmark Tool for MySQL
• DBT3 (TPC-H, complex and long running queries, data warehouse (DWH))
• TM1 (3^rd party, ODBC, telecom benchmark)
• TPC Benchmarks …

Transaction performance relates among other things from I/O performance. This means hard disk performance.

Hard disk performance

When you select a hard disk, an important feature to consider is the performance (speed) of the drive. Hard disks come in a wide range of performance capabilities. As is true of many things, one of the best indicators of a drive’s relative performance is its price. An old saying from the automobile-racing industry is appropriate here: “Speed costs money. How fast do you want …