SQL Interface（DDL、DML，stored procedures、View、Trigger）
Archive
merge
Optimizer（Access Paths、statistics）
Parser（Query Translation、Object Privilege）
management service & utilities（Backup & Recovery ，security，replication，cluster，administration，Configuration，migration，metadata）
Connector（连接）navicat api、jdbc、.net、php、python、Perl、Rubby、Cobol
Federated
myIsam
connection poolauthentication- thread reuse- connection limits- check memory- caches
custom
memory
File System Files&LogsNTFS-NFS Redo undo Data Index Binary SAN NAS Error Query slow
bdb
cluster
Pluggable Storage Enginesmemory index & storage management
Caches & Buffer（global and engine specific caches && buffer）
InnoDb
