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What structure does the MySQL InnoDB storage engine use to store its indexes?
system tablespace
By default, all InnoDB tables and indexes are stored in the system tablespace. As an alternative, you can store each InnoDB table and its indexes in its own file. This feature is called “multiple tablespaces” because each table that is created when this setting is in effect has its own tablespace.
What is InnoDB page size?
The default InnoDB page size is 16384 (16KB). Page Size (innodb_page_size) Minimum File Size. 16384 (16KB) or less.
How does MySQL InnoDB work?
InnoDB tables arrange your data on disk to optimize queries based on primary keys. Each InnoDB table has a primary key index called the clustered index that organizes the data to minimize I/O for primary key lookups. See Section 14.6. To maintain data integrity, InnoDB supports FOREIGN KEY constraints.
How is the size of a page compressed in InnoDB?
Therefore, page compression only works if page data can be compressed to a size that is less than or equal to the InnoDB page size minus the file system block size. For example, if innodb_page_size=16K and the file system block size is 4K, page data must compress to less than or equal to 12K to make hole punching possible.
What’s the name of the IBD file in InnoDB?
The file ibdata1 is the system tablespace for the InnoDB infrastructure. You can divorce Data and Index Pages from ibdata1 by enabling innodb_file_per_table. This will cause any newly created InnoDB table to store data and index pages in an external .ibd file.
What are the InnoDB files in MySQL-database?
If you want to know what the ib_logfile0 and ib_logfile1 are for, they are the InnoDB Redo Logs. They should never be erased or resized until a full normal shutdown of mysqld has taken place. If mysqld ever crashes, just start up mysqld.
What is the physical structure of an InnoDB index?
14.6.2.2 The Physical Structure of an InnoDB Index. With the exception of spatial indexes, InnoDB indexes are B-tree data structures. Spatial indexes use R-trees, which are specialized data structures for indexing multi-dimensional data. Index records are stored in the leaf pages of their B-tree or R-tree data structure.