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How does InnoDB store data on disk?
When you create a table using the InnoDB storage engine, data written to that table is stored on the file system in a data file called a tablespace. Tablespace files contain both the data and indexes. When innodb_file_per_table=ON is set, InnoDB uses one tablespace file per InnoDB table.
Where is InnoDB data stored?
System Tablespace
3.1 The System Tablespace. The system tablespace is the storage area for the InnoDB data dictionary, the doublewrite buffer, the change buffer, and undo logs. It may also contain table and index data if tables are created in the system tablespace rather than file-per-table or general tablespaces.
How to improve InnoDB performance in MySQL 5.5.4?
MariaDB/MySQL 5.5.4 introduces new configuration settings for the InnoDB storage engine. This can greatly improve MySQL’s InnoDB performance, both in read and write operations. One of those settings is innodb_buffer_pool_instances. The innodb_buffer_pool_instances divides the InnoDB buffer pool into separate instances.
How to define full text index size in InnoDB?
The innodb_ft_cache_size variable is used to configure the full-text index cache size (on a per-table basis), which affects how often the full-text index cache is flushed. You can also define a global full-text index cache size limit for all tables in a given instance using the innodb_ft_total_cache_size variable.
How big should InnoDB buffer pool be in MySQL?
For best efficiency, specify a combination of innodb_buffer_pool_instances and innodb_buffer_pool_size so that each buffer pool instance is at least 1 gigabyte. In MySQL versions prior to 5.5.4 this was not configurable and thus set to just one instance.
Why are batch Flushing and caching used in MySQL?
The caching and batch flushing behavior avoids frequent updates to auxiliary index tables, which could result in concurrent access issues during busy insert and update times. The batching technique also avoids multiple insertions for the same word, and minimizes duplicate entries.