buffer pool,
parsed andoptimized SQL statements,
data dictionarycache,
log buffer,
locks for eachtransaction,
hash table forthe adaptive index,
state andbuffers for each SQL query currently being executed,
session foreach user, and
stack for eachOS thread.
9大塊通過4部分進行管理
A solution tothe memory management:
1. the bufferpool size is set separately;
2. log buffersize is set separately;
3. the commonpool size for all the other entries, except 8, is set separately.
也就是緩沖池，redo日誌緩沖，普通池和8（用戶session信息，可看做壹部分）
redo日誌緩沖由redo部分單獨管理，bufferpool也就是緩沖池是壹個復雜的部分，內容很多，普通池上面說了，除了8，和1,2.其余的都歸它管。上面這個結構就是mysql內存子系統的完整圖景。
所以說是c和c++寫的