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MySQL 5.7 Reference Manual  /  The InnoDB Storage Engine  /  Introduction to InnoDB

15.1 Introduction to InnoDB

InnoDB is a general-purpose storage engine that balances high reliability and high performance. In MySQL 5.7, InnoDB is the default MySQL storage engine. Unless you have configured a different default storage engine, issuing a CREATE TABLE statement without an ENGINE= clause creates an InnoDB table.

Key Advantages of InnoDB

Key advantages of InnoDB include:

Table 15.1 InnoDB Storage Engine Features

Storage limits64TBTransactionsYesLocking granularityRow
MVCCYesGeospatial data type supportYesGeospatial indexing supportYes[a]
B-tree indexesYesT-tree indexesNoHash indexesNo[b]
Full-text search indexesYes[c]Clustered indexesYesData cachesYes
Index cachesYesCompressed dataYes[d]Encrypted data[e]Yes
Cluster database supportNoReplication support[f]YesForeign key supportYes
Backup / point-in-time recovery[g]YesQuery cache supportYesUpdate statistics for data dictionaryYes

[a] InnoDB support for geospatial indexing is available in MySQL 5.7.5 and higher.

[b] InnoDB utilizes hash indexes internally for its Adaptive Hash Index feature.

[c] InnoDB support for FULLTEXT indexes is available in MySQL 5.6.4 and higher.

[d] Compressed InnoDB tables require the InnoDB Barracuda file format.

[e] Implemented in the server (via encryption functions). Data-at-rest tablespace encryption is available in MySQL 5.7 and higher.

[f] Implemented in the server, rather than in the storage engine.

[g] Implemented in the server, rather than in the storage engine.


To compare the features of InnoDB with other storage engines provided with MySQL, see the Storage Engine Features table in Chapter 16, Alternative Storage Engines.

InnoDB Enhancements and New Features

For information about InnoDB enhancements and new features in MySQL 5.7, refer to:

Additional InnoDB Information and Resources


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