MySQL / MariaDB Expert

We have a large database estate with many database clusters and are looking for a MySQL / MariaDB specialist for ongoing long term support engagement.

You will need in-depth knowledge of:

- MySQL and MariaDB

- Replication options (synchronous and asynchronous)

- Performance optimization techniques

- Query optimization and rewriting

- Linux, especially file systems and storage stack tuning

In your proposal, please answer the following questions:

1) Briefly describe and explain configuration of one of the synchronous (not asynchronous) replication methods available in MySQL or MariaDB?

2) At peak times, you are notice that the MySQL server's response times are very poor. You look at the output of SHOW FULL PROCESSLIST; and you notice there are a lot of queries in "opening tables" state. What configuration option would you look at changing first?

3) You have a query that is indexed as well as it can be, but requires a very large, expensive sort operation due to having a GROUP BY clause that spans fields in multiple tables. Describe a technique you would use to enable you to make that query fully indexable and avoid the sorting operation?

4) You are required to carry out performance analysis and optimisation on a busy server. Explain the steps you would follow to identify the most problematic queries and sub-optimal server configuration.

5) You are tasked with configuring a new MariaDB server for a project. Only InnoDB storage engine will be used. List the settings you would configure each layer of the storage stack with, including file system (of your preference) and RAID (or equivalent), and how those would match up with any relevant MariaDB level configuration.

Skills: Linux, MySQL, Apache, System Admin, Database Administration

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About the Employer:
( 0 reviews ) Camberley, United Kingdom

Project ID: #23923913

22 freelancers are bidding on average £38/hour for this job


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Hi, I have experience in cluster set up for both webserver as well as database. Please discuss so that i can answer all your queries. Thank you

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Well this is an interesting project. I have been using Galera cluster for this AUS firm for the last couple of years. Answer1 --- To answer your first question. I use MariaDB 10.4.X and Galera4. The nodes are alway More

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Hello I'm expert in MySQL / MariaDB and I have knowledge of MySQL and MariaDB - Replication options (synchronous and asynchronous) - Performance optimization techniques - Query optimization and rewriting - Linux, espe More

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1) If I have Query A,B,C ( B relies on A, C relies on B) So I do the straight forward thing and run them in the order A, B and C. Replication puts them into a log in that same order. So when the slave executes them, i More

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