In this webinar, Sveta Smirnova, MySQL Engineer at Percona, will uncover nuances of Percona XtraDB Cluster (PXC) schema upgrades and point out details you need to give extra attention to.
Percona XtraDB Cluster (PXC) is a 100% synchronized cluster in regards to DML operations. It is ensured by the optimistic locking model and ability to rollback transaction which cannot be applied on all nodes. However, DDL operations are not transactional in MySQL. This adds complexity when you need to change the schema of the database. Changes made by DDL may affect the results of the queries. Therefore all modifications must replicate on all nodes prior to next data access. For operations that run momentarily, it can be easily achieved, but schema changes may take hours to apply. Therefore in addition to the safest synchronous blocking schema upgrade method: TOI, – PXC supports more relaxed, though not safe, method RSU. RSU: Rolling Schema Upgrade is …
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