This document discusses considerations for migrating to Galera Cluster replication from MySQL or other database systems. It covers differences in supported features between Galera and MySQL, including storage engines, tables without primary keys, auto-increment handling, and DDL processing. It also addresses multi-master conflicts, long transactions, LOAD DATA processing, and using Galera with MySQL replication. An overview of online migration is provided along with guidance on validating schemas and checking for compatibility prior to migration.
- Galera is a MySQL clustering solution that provides true multi-master replication with synchronous replication and no single point of failure. - It allows high availability, data integrity, and elastic scaling of databases across multiple nodes. - Companies like Percona and MariaDB have integrated Galera to provide highly available database clusters.
合并到 XtraDB 存储引擎集群 http://www.ossez.com/forum.php?mod=viewthread&tid=26834&fromuid=426 (出处: OSSEZ)
This document provides an introduction to parallel synchronous replication using Percona XtraDB Cluster (PXC). It discusses the limitations of traditional MySQL replication and how PXC implements a data-centric approach with synchronous multi-master replication between nodes. Key features of PXC highlighted include parallel replication, data consistency, and automatic provisioning of new nodes. The document also covers integration with load balancers and limitations to be aware of for write-intensive or large transaction workloads.
Database schema changes are usually not popular among DBAs or sysadmins, not when you are operating a cluster and cannot afford to switch off the service during a maintenance window. There are different ways to perform schema changes, some procedures being more complicated than others. Galera Cluster is great at making your MySQL database highly available, but are you concerned about schema changes? Is an ALTER TABLE statement something that requires a lot of advance scheduling? What is the impact on your database uptime? This is a common question, since ALTER operations in MySQL usually cause the table to be locked and rebuilt – which can potentially be disruptive to your live applications. Fortunately, Galera Cluster has mechanisms to replicate DDL across its nodes. In these slides, you will learn about the following: How to perform Zero Downtime Schema Changes 2 main methods: TOI and RSU Total Order Isolation: predictability and consistency Rolling Schema Upgrades pt-online-schema-change Schema synchronization with re-joining nodes Recommended procedures Common pitfalls/user errors The slides are courtesy of Seppo Jaakola, CEO, Codership - creators of Galera Cluster
This presentation is aim to give an initial understanding of how MySQL/Galera works, and some advice.
Upgrading MySQL databases do not come without risk. There is no guarantee that no problems will happen if you move to a new major MySQL version. Should we just upgrade and rollback immediately if problems occur? But what if these problems only happen a few days after migrating to this new version? You might have a database environment that is risk-adverse, where you really have to be sure that this new MySQL version will handle the workload properly. Examples: - Both MySQL 5.6 and 5.7 have a lot of changes in the MySQL Optimizer. It is expected that this improves performance of my queries, but is it really the case? What if there is a performance regression? How will this affect my database performance? - Also, there are a lot of incompatible changes which are documented in the release notes, how do I know if I'm affected by this in my workload? It's a lot to read.. - Can I go immediately from MySQL 5.5 to 5.7 and skip MySQL 5.6 even though the MySQL documentation states that this is not supported? - Many companies have staging environments, but is there a QA team and do they really test all functionality, under a similar workload? This presentation will show you a process, using open source tools, of these types of migrations with a focus on assessing risk and fixing any problems you might run into prior to the migration. This process can then be used for various changes: - MySQL upgrades for major version upgrades - Switching storage engines - Changing hardware architecture Additionally, we will describe ways to do the actual migration and rollback with the least amount of downtime.
This document provides an overview and agenda for a webinar on managing and monitoring MySQL clusters using ClusterControl by Severalnines. The webinar host is introduced and instructions are provided for asking questions. The webinar will cover topics such as operating system configuration, backup strategies, replication, query performance, schema changes, security, reporting, and disaster recovery. Case studies and customers are also briefly mentioned.
This set of slides gives you an overview of Galera, configuration basics and deployment best practices. The following topics are covered: - Concepts - Node provisioning - Network partitioning - Configuration example - Benchmarks - Deployment best practices - Galera monitoring and management
This document provides a hands-on tutorial for advanced Percona XtraDB Cluster users. It discusses setting up a 3 node PXC cluster environment in VirtualBox and bootstrapping the initial cluster. It then covers topics like avoiding state snapshot transfers when restarting MySQL, recovering from clean and unclean shutdowns, and reproducing and diagnosing different types of conflicts through examples.
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.
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.
Tips on how to improve your MySQL Galera Cluster daily usage (Percona XtraDB Cluster, MariaDB Galera Cluster)
In this webinar, we will describe how to get started with Galera Cluster and build a functional multi-master cluster. First, will show how to easily install the required packages using the new preferred installation method – the dedicated Galera package repository. Then we will discuss the important Galera configuration settings and how to select values for them. Finally, we will demonstrate how to bootstrap a 3-node Galera installation with the right sequence of steps. Once the nodes are up and running we will discuss how to monitor the health of the cluster and which status variables are important to watch. Galera Cluster is trusted by thousands of users. Galera Cluster powers Percona XtraDB Cluster and MariaDB Enterprise Cluster. This is a webinar presented by Codership, the developers and experts of Galera Cluster.
Introduction to Galera clustering with MySQL. Installation, configuration, startup, internal architecture, replication topologies, load balancers, benchmarks.