When MySQL commits a large transaction carrying gigabytes of changes, writing it to the binary log (binlog) can freeze every other commit on the server for minutes. This includes transactions that touch unrelated data. This bottleneck is detrimental to applications that depend on low commit latency. On October 29, 2026, AWS shipped an optimization into community MySQL that removes this bottleneck. We call it Binary Log Optimization for Large Transactions (BOLT). It has been available in Amazon Aurora MySQL since v1.22.0 and in all currently supported major versions (Aurora MySQL 2.x, 3.x, and 8.4.x), where it’s always on for every customer. BOLT is planned to be released as part of a future MySQL innovation release.
BOLT provides …
[Read more]