innodb_autoextend_increment

The increment size (in MB) for extending the size of an auto-extending system tablespace file when it becomes full. The default value is 8. This variable does not affect the per-table tablespace files that are created if you useinnodb_file_per_table=1. Those files are auto-extending regardless of the value ofinnodb_autoextend_increment. The initial extensions are by small amounts, after which extensions occur in increments of 4MB.