转自这里
默认的innodb_buffer_pool_size=8M
查看本地innodb_buffer_pool_size大小的方法：
mysql> show variables like "%_buffer%";
+------------------------------+-----------+
| Variable_name | Value |
+------------------------------+-----------+
| bulk_insert_buffer_size | 8388608 |
| innodb_buffer_pool_instances | 1 |
| innodb_buffer_pool_size | 134217728 |
| innodb_change_buffering | all |
| innodb_log_buffer_size | 8388608 |
| join_buffer_size | 131072 |
| key_buffer_size | 16777216 |
| myisam_sort_buffer_size | 8388608 |
| net_buffer_length | 16384 |
| preload_buffer_size | 32768 |
| read_buffer_size | 131072 |
| read_rnd_buffer_size | 262144 |
| sort_buffer_size | 2097152 |
| sql_buffer_result | OFF |
+------------------------------+-----------+
14 rows in set (0.00 sec)