MySQL tablespace parsing

summary

The first few sections , I introduced the row record , page , Indexes （B+） Structure , Both leaf and non leaf nodes of an index are composed of pages , The size of the page is 16k, Full rows of records can be stored . So here comes the question , A table has multiple indexes , How are these indexes organized , The answer is the tablespace we are going to talk about today , Table spaces really describe how a table can reasonably store multiple indexes , That is, table data （ Index is data ）.

Table space structure parsing

1. Overall table space structure

1. A tablespace is actually a file , There is mysql Under the data directory during installation 

2. Every time you create a table , It will generate a .idb file , This file is a table space file 

3. A table file is divided into many extend( District ), Every time 255 A zone is a group 

2. Zone structure analysis