Feature Comparison
After mysql5.5 default storage engine is InnoDB, before this default storage engine is MyIsam
| Feature | MyIsam | InnoDB |
| Lock mechanism | Table lock | Row lock |
| Affairs | not support | stand by |
| Foreign key | not support | stand by |
| B-tree index | stand by | stand by |
| Hash indexes | not support | stand by |
| Full-text index | stand by | It does not support (support began after 5.6.4) |
Other differences
1) For the delete operation, InnoDB is progressive deletion, MyIsam is deleted surface reconstruction
2) for the count () function, the internal MyIsam maintains a count variable, InnoDB need to scan the entire table
3) For self-growth fields, such as the need to index the index must be independent, MyIsam allows multi-column indexes
Comparison of application scenarios
MyIsam
1) for reading and writing little scenes, such as a news blog site
2) often use count () function
InnoDB
1) Reading and writing are also many scenes
2) high security requirements, the need to support the transaction