Case fileData Engineering
A 24/7 production system on legacy MySQL 5.7 with roughly 5 TB of data, moved to a modern MySQL environment by replication with no service interruption at cutover.
A production database of approximately 5 TB was running on legacy MySQL 5.7 under a 24/7 workload. It had to move to a modern MySQL environment, and there was no maintenance window in which the system could stop.
A migration of that size cannot be a dump and restore. Data keeps changing during the copy, the newer MySQL version rejects configuration the old one accepted, and the moment of cutover is the moment the business is exposed.
What made it non-trivial
Qzentra planned and ran a replication-based migration. The MySQL 5.7 workload was audited for compatibility with the target environment, and deprecated variables were remediated before any data moved.
A replica was built on the modern environment and synchronized with the live source while it continued to serve traffic. At cutover the replica was promoted, with no service interruption. Afterwards, queries were modernized using common table expressions.
What Qzentra was responsible for
Five steps, all in the two foundation layers. Nothing above Infrastructure was touched, and nothing needed to be.
The existing workload was audited against the target MySQL environment before anything moved, to find what would break.
Configuration variables deprecated in the target version were remediated on the source side, so the target would accept the workload.
A replica was built on the modern environment and kept synchronized with the live source, which continued to serve traffic.
Cutover was the promotion of the synchronized replica to primary. There was no service interruption.
After the migration, queries were modernized using common table expressions, as a separate step from the cutover.
With roughly 5 TB changing under a 24/7 workload, the way to move without stopping is to build a replica and keep it synchronized until the switch.
The 5.7 workload was audited against the target before migration and deprecated variables were remediated, so incompatibilities were found in the audit rather than at cutover.
Cutover was the promotion of an already synchronized replica. That reduces the switch to a controlled step rather than a data move.
Query modernization with CTEs was done after the migration, not folded into the cutover.
Named last, with the role each played. The capabilities are what the project demonstrates beyond its primary service.
Capabilities demonstrated
Discuss a project
Tell us the version, the size, the workload, and what it has to move to. Migrations are planned from the risk backwards.