Known Limitations of NDB Cluster 23.1.6.3 NDB and InnoDB Feature Usage Summary 23.1.7 Known Limitations of NDB Cluster In the sections that follow, we discuss known limitations in current releases of NDB Cluster as compared with the features available when using the  MyISAM  and  InnoDB  storage engines. If you check the “Cluster” category in the MySQL bugs database at http://bugs.mysql.com, you can find known bugs in the following categories under “MySQL Server:”  in the MySQL bugs database at http://bugs.mysql.com, which we intend to correct in upcoming releases of NDB Cluster: When comparing application feature requirements to the capabilities of  InnoDB  with  NDB , some are clearly more compatible with one storage engine than the other. The following table lists supported application features according to the storage engine to which each feature is typically better suited. Table 23.4 Supported application features according to the storage engine to which each feature is typically better suited Workload InnoDB NDB Cluster ( NDB ) DSS Applications (data marts, analytics) Yes Limited (Join operations across OLTP datasets not exceeding 3TB in size) Custom Applications Yes Yes Packaged Applications Yes Limited (should be mostly primary key access); NDB Cluster 8.0 supports foreign keys In-Network Telecoms Applications (HLR, HSS, SDP) No Yes Session Management and Caching Yes Yes E-Commerce Applications Yes Yes User Profile Management, AAA Protocol Yes Yes Preferred application requirements for  InnoDB Preferred application requirements for  NDB •Foreign keys Note NDB Cluster 8.0 supports foreign keys •Full table scans •Very large databases, rows, or transactions •Transactions other than  READ COMMITTED •Write scaling •99.999% uptime •Online addition of nodes and online schema operations •Multiple SQL and NoSQL APIs (see NDB Cluster APIs: Overview and Concepts) •Real-time performance •Limited use of  BLOB  columns •Foreign keys are supported, although their use may have an impact on performance at high throughput 3964