Now that InnoDB is the default storage engine in MySQL, is it time to update the default configuration for the InnoDB log file size (innodb_log_file_size) setting?
In general, there are two settings that simply can’t be left at their historical defaults for a production installation. MySQL 5.5 increased the default buffer pool size to something more sane (128MB instead of 8MB), but the log file size remains at 5MB. That’s 10MB total, because there are two logs by default.
Is it time to update this? I think so. You simply can’t run a “real” server with 10MB of transaction logs. What’s a sane value? I’d say that something between 64MB and 256MB would be okay for a lot of entry-level workloads, but that would consume some disk space that might surprise people. Perhaps this is the reason that the default hasn’t been increased from 5MB. Regardless, I think that 64MB times two is okay as a default.
What do you think? Write your suggestion for a default log file size into the comments.
By the way, if you’re looking to choose a good log file size for your workload, an arbitrary number such as 64MB or 256MB isn’t great. You can get a good start by using the heuristic shown in this old blog post.