Because some internal design, but we are in the future presentation, we might dig into it, delve into it to explain why. It’s much shorter than the time it basically takes to execute the same transactions on the secondary or secondaries. That’s not the topic in Galera Replication But just to keep in mind that the time it takes on the primary is much shorter for any given transactions. The data is going to be encapsulated into some write set, and the write set will be broadcast into the secondaries. Let’s say you have your app, your web server sending requests to the primary. ![]() In this diagram, we have a simplistic data flow or representation of the application in Galera. We are talking about the Galera Replication Basically, the flow control in Galera Replication First, let’s define Galera Replication Galera Replication is replication scheme used to make the data flow from writer to reader, so primary to secondary node. Your browser does not support the iframe element. Batch your large commits to help the replication keep up with the primary.Bulk executions only happen on the primary.Finding thread numbers in mysql slow query logs.Galera replication to secondary database.By doing things in batch, it allows the actions to be executed in a timely manner and performance impacts are kept down to a minimum. ![]() Because the secondary databases are performing things one at a time, is a reason for things to not be in sync and performance impacts can be detected.Īs a solution, if possible, batch your large operations to help the secondary databases keep in sync with the primary. When reviewing the Mysql slow query logs, you find this action can take a long time. For example, if you have 67,000,000 items in a delete, on the secondary databases each one happens one at a time. When the replication happens for all the secondary databases, they do actions one at a time. The primary database can perform bulk operations. When considering secondary databases, it is important to understand the way the data replication happens is different than on the primary. Galera clusters help with performance and scalability. ![]() Learn about Galera DB replication and related MySQL slow queries
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