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The travel website is also a dedicated contributor to the MySQL […]
State Snapshot Transfer (SST) at a glance
PXC uses a protocol called State Snapshot Transfer to provision a node joining an existing cluster with all the data it needs to synchronize. This is analogous to cloning a slave in asynchronous replication: you take a full backup of one node and copy it to the new […]
I have heard this question quite often: “At busy times, our replicas start lagging quite frequently. We are using N schemas, so which performance boost could we expect from MySQL 5.6 parallel replication?” Here is a quick way to give you a rough estimate of the potential benefit.
General idea
In MySQL 5.6, parallelism is added […]
During the last couple of months I have been involved in an unusually high amount of performance audits for e-commerce applications running with Magento. And although the systems were quite different, they also had one thing in common: the MySQL query cache was very useful. That was counter-intuitive for me as I’ve always expected […]
Read moreIST Basics
State transfers in Galera remain a mystery to most people. Incremental State transfers (as opposed to full State Snapshot transfers) are used under the following conditions:
The Joiner node reports Galera a valid Galera GTID to the cluster
The Donor node selected contains all the transactions the Joiner needs to catch up to the rest […]
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