Documentation Home
MySQL 5.6 Reference Manual
Related Documentation Download this Manual
PDF (US Ltr) - 31.4Mb
PDF (A4) - 31.4Mb
PDF (RPM) - 30.6Mb
EPUB - 7.8Mb
HTML Download (TGZ) - 7.6Mb
HTML Download (Zip) - 7.6Mb
HTML Download (RPM) - 6.5Mb
Eclipse Doc Plugin (TGZ) - 8.3Mb
Eclipse Doc Plugin (Zip) - 10.2Mb
Man Pages (TGZ) - 185.3Kb
Man Pages (Zip) - 297.9Kb
Info (Gzip) - 2.9Mb
Info (Zip) - 2.9Mb
Excerpts from this Manual

MySQL 5.6 Reference Manual  /  ...  /  Benefits of Using InnoDB Tables

14.1.1 Benefits of Using InnoDB Tables

If you use MyISAM tables but are not committed to them for technical reasons, you may find InnoDB tables beneficial for the following reasons:

  • If your server crashes because of a hardware or software issue, regardless of what was happening in the database at the time, you don't need to do anything special after restarting the database. InnoDB crash recovery automatically finalizes any changes that were committed before the time of the crash, and undoes any changes that were in process but not committed. Just restart and continue where you left off.

  • The InnoDB storage engine maintains its own buffer pool that caches table and index data in main memory as data is accessed. Frequently used data is processed directly from memory. This cache applies to many types of information and speeds up processing. On dedicated database servers, up to 80% of physical memory is often assigned to the InnoDB buffer pool.

  • If you split up related data into different tables, you can set up foreign keys that enforce referential integrity. Update or delete data, and the related data in other tables is updated or deleted automatically. Try to insert data into a secondary table without corresponding data in the primary table, and the bad data gets kicked out automatically.

  • If data becomes corrupted on disk or in memory, a checksum mechanism alerts you to the bogus data before you use it.

  • When you design your database with appropriate primary key columns for each table, operations involving those columns are automatically optimized. It is very fast to reference the primary key columns in WHERE clauses, ORDER BY clauses, GROUP BY clauses, and join operations.

  • Inserts, updates, and deletes are optimized by an automatic mechanism called change buffering. InnoDB not only allows concurrent read and write access to the same table, it caches changed data to streamline disk I/O.

  • Performance benefits are not limited to giant tables with long-running queries. When the same rows are accessed over and over from a table, a feature called the Adaptive Hash Index takes over to make these lookups even faster, as if they came out of a hash table.

  • You can compress tables and associated indexes.

  • You can create and drop indexes with much less impact on performance and availability.

  • Truncating a file-per-table tablespace is very fast, and can free up disk space for the operating system to reuse, rather than freeing up space within the system tablespace that only InnoDB could reuse.

  • The storage layout for table data is more efficient for BLOB and long text fields, with the DYNAMIC row format.

  • You can monitor the internal workings of the storage engine by querying INFORMATION_SCHEMA tables.

  • You can monitor the performance details of the storage engine by querying Performance Schema tables.

  • You can freely mix InnoDB tables with tables from other MySQL storage engines, even within the same statement. For example, you can use a join operation to combine data from InnoDB and MEMORY tables in a single query.

  • InnoDB has been designed for CPU efficiency and maximum performance when processing large data volumes.

  • InnoDB tables can handle large quantities of data, even on operating systems where file size is limited to 2GB.

For InnoDB-specific tuning techniques you can apply in your application code, see Section 8.5, “Optimizing for InnoDB Tables”.


User Comments
Sign Up Login You must be logged in to post a comment.