Galera cluster for high availability

This presentation was made by Mr. Santhinesh Kumar Nagendran at Mydbops Database Meetup -2 held at Bangalore on 26-01-2019.

Maxscale 이해와 활용. 202311

This document provides an overview of different database replication technologies including Galera Cluster, Percona XtraDB Cluster, and MySQL Group Replication. It discusses similarities between the technologies such as multi-master replication topologies and consistency models. Key differences are also outlined relating to node provisioning, failure handling, and operational limitations of each solution. Known issues uncovered through quality assurance testing are also briefly mentioned.

Built-in MySQL Replication is known for its capability to enable to scale reads easily. However, there are some limitations and known issues with this solution because of the asynchronous nature of this replication. This talk will describe another way of doing MySQL replication, by using synchronous replication, available in Percona XtraDB Cluster. The open source solution will be explained and compared to traditional asynchronous MySQL replication, as well as some known use cases will be described. Percona XtraDB Cluster is an, open source, high availability and high scalability solution for MySQL clustering. Features include: Synchronous replication, Multi-master replication support, Parallel replication, Automatic node provisioning.

Performance Schema is a powerful diagnostic instrument for: - Query performance - Complicated locking issues - Memory leaks - Resource usage - Problematic behavior, caused by inappropriate settings - More It comes with hundreds of options which allow precisely tuning what to instrument. More than 100 consumers store collected data. In this tutorial, we will try all the important instruments out. We will provide a test environment and a few typical problems which could be hardly solved without Performance Schema. You will not only learn how to collect and use this information but have experience with it. Tutorial at Percona Live Austin 2019

This document provides an overview and summary of various high availability (HA) solutions for MySQL databases. It begins with an introduction to HA and definitions of key terms. It then discusses MySQL replication, including asynchronous, semi-synchronous, and features in MySQL 5.6 and MariaDB 10.0. Other HA solutions covered include MHA for automated failover, Galera/MariaDB Galera Cluster for synchronous replication, shared disk solutions like DRBD, and MySQL Cluster for in-memory synchronous replication across nodes. The document provides brief descriptions of how each solution works and when it may be applicable.

MaxScale is a database proxy that provides load balancing, connection pooling, and replication capabilities for MariaDB and MySQL databases. It can be used to scale databases horizontally across multiple servers for increased performance and availability. The document provides an overview of MaxScale concepts and capabilities such as routing, filtering, security features, and how it can be used for operational tasks like query caching, logging, and data streaming. It also includes instructions on setting up MaxScale with a basic example of configuring read/write splitting between a master and slave database servers.

The document discusses best practices for Galera Cluster, a synchronous multi-master replication solution for MySQL/InnoDB. It covers topics like dealing with conflicts in a multi-master setup, performing state transfers when adding new nodes, different backup methods that assign a global transaction ID, and techniques for upgrading schemas in a clustered environment.

MariaDB 10.0 introduces domain-based parallel replication which allows transactions in different domains to execute concurrently on replicas. This can result in out-of-order transaction commit. MariaDB 10.1 adds optimistic parallel replication which maintains commit order. The document discusses various parallel replication techniques in MySQL and MariaDB including schema-based replication in MySQL 5.6 and logical clock replication in MySQL 5.7. It provides performance benchmarks of these techniques from Booking.com's database environments.

We talk a lot about Galera Cluster being great for High Availability, but what about Disaster Recovery (DR)? Database outages can occur when you lose a data centre due to data center power outages or natural disaster, so why not plan appropriately in advance? In this webinar, we will discuss the business considerations including achieving the highest possible uptime, analysis business impact as well as risk, focus on disaster recovery itself, as well as discussing various scenarios, from having no offsite data to having synchronous replication to another data centre. This webinar will cover MySQL with Galera Cluster, as well as branches MariaDB Galera Cluster as well as Percona XtraDB Cluster (PXC). We will focus on architecture solutions, DR scenarios and have you on your way to success at the end of it.

The document provides an overview of high availability and configuration management options for ProxySQL. It discusses deploying ProxySQL locally on application servers, in a dedicated layer, or using both approaches. When deploying in a dedicated layer, options for high availability include keepalived, load balancers, Consul, and Kubernetes. Configuration can be managed through tools like Ansible, Puppet, or by loading SQL files. ProxySQL Cluster enables syncing configuration across nodes.

Want to understand how to set high availability solutions for MySQL using MariaDB Galera Cluster? Join this webinar, and learn from experts. During this webinar, you will also get guidance on how to implement MariaDB Galera Cluster.

Of course there is no such thing as perfect service discovery, and we will see why in the talk. However, the way ProxySQL is deployed in this case minimizes the risk for split-brains, and this is why I qualify it as almost perfect. But let’s step back a little... MySQL alone is not a high availability solution. To provide resilience to primary failure, other components need to be integrated with MySQL. At MessageBird, these additional components are ProxySQL and Orchestrator. In this talk, we describe how ProxySQL is architectured to provide close to perfect Service Discovery and how this, combined with Orchestrator, allows for automatic failover. The talk presents the details of the integration of MySQL, ProxySQL and Orchestrator in Google Cloud (and it would be easy to re-implement a similar architecture at other cloud vendors or on-premises). We will also cover lessons learned for the 2 years this architecture has been in production. Come to this talk to learn more about MySQL high availability, ProxySQL and Orchestrator.

This presentation talk will assist you in troubleshooting MySQL replication for the most common issues we might face with a simple comparison of how can we get them solved in the different replication methods (Classic VS GTID).

To get better replication speed and less lag, MySQL implements parallel replication in the same schema, also known as LOGICAL_CLOCK. But fully benefiting from this feature is not as simple as just enabling it. In this talk, I explain in detail how this feature works. I also cover how to optimize parallel replication and the improvements made in MySQL 8.0 and back-ported in 5.7 (Write Sets), greatly improving the potential for parallel execution on replicas (but needing RBR). Come to this talk to get all the details about MySQL 5.7 and 8.0 Parallel Replication.

24시간 365일 서비스를 위한 MySQL DB 이중화. MySQL 이중화 방안들에 대해 알아보고 운영하면서 겪은 고민들을 이야기해 봅니다. 목차 1. DB 이중화 필요성 2. 이중화 방안 - HW 이중화 - MySQL Replication 이중화 3. 이중화 운영 장애 4. DNS와 VIP 5. MySQL 이중화 솔루션 비교 대상 - MySQL을 서비스하고 있는 인프라 담당자 - MySQL 이중화에 관심 있는 개발자

This document discusses the risks of using asynchronous master-master replication for MySQL databases and provides strategies for setting it up safely. It explains that having two nodes actively accepting writes can lead to conflicts like duplicate key errors. It recommends dividing writes across nodes by database, table, or row to avoid conflicts. The document also discusses using synchronous replication tools like Galera to ensure consistency across nodes at the cost of reduced performance.

Talk at PerconaLive Dublin 2017, https://www.percona.com/live/e17/sessions/why-mysql-replication-fails-and-how-to-get-it-back

Designing an extensible, flexible schema that supports user customization is a common requirement, but it's easy to paint yourself into a corner. Examples of extensible database requirements: - A database that allows users to declare new fields on demand. - Or an e-commerce catalog with many products, each with distinct attributes. - Or a content management platform that supports extensions for custom data. The solutions we use to meet these requirements is overly complex and the performance is terrible. How should we find the right balance between schema and schemaless database design? I'll briefly cover the disadvantages of Entity-Attribute-Value (EAV), a problematic design that's an example of the antipattern called the Inner-Platform Effect, That is, modeling an attribute-management system on top of the RDBMS architecture, which already provides attributes through columns, data types, and constraints. Then we'll discuss the pros and cons of alternative data modeling patterns, with respect to developer productivity, data integrity, storage efficiency and query performance, and ease of extensibility. - Class Table Inheritance - Serialized BLOB - Inverted Indexing Finally we'll show tools like pt-online-schema-change and new features of MySQL 5.6 that take the pain out of schema modifications.

am sure you all know that troubleshooting problems related to locking and blocking (hey, sometimes there are deadlocks too) can be a real nightmare! In this session, you will be able to see and understand why and how locking actually works, what problems it causes and how can we use isolation levels and various other techniques to resolve them!

MySQL Replication, in addition to bringing high-availability, is the foundation to build high-performance MySQL database systems. Using read scale-out and sharding one can design systems that go from the capacity of a single server to supporting the largest internet sites. But to design and operate high-performance, efficient, manageable and reliable deployments requires knowing the intricacies of the underlying technologies. This session will provide insights on the main factors that affect the performance of Asynchronous Replication and Group Replication, and how to configure them to make the most out of the underlying computing system. It will also show the latest developments in MySQL 5.7 and 8.0, in areas spanning from group communication to the multi-threaded slave applier, and how effective they are in helping meet the performance requirements in terms of throughput, latency and durability to support the most demanding workload types.