Database Indexes In InnoDB And MyISAM: B+ Trees And Clustered Indexes
Database indexes in InnoDB & MyISAM: Primary Indexes store primary key & row record, Secondary Indexes store indexed column & pointer. InnoDB's clustered index combines data & indexes, while MyISAM uses separate B+ trees for each index type.
Database indexes are divided into Primary Indexe and Secondary Indexe. How do InnoDB and MyISAM utilize B+ trees to implement these two types of indexes, and what are the differences between them? Question 1: What is the index structure of MyISAM? In MyISAM, the index structure is separate from the data rows, meaning it uses what is called a non-clustered index. The primary index and secondary index in MyISAM don’t have any significant differences: There is a contiguous storage region for row records. In a primary index, the leaf nodes store the primary key along with the correspond...