Comment 0 for bug 1323765

Foreign key processing is suspected to cause performance bottleneck.

One test manifesting this is to load employee database from: https://launchpad.net/test-db/, and measure load times when FKs are enabled / disabled.

Here are test results with MySQL 5.6.17 development head version, compared to native MySQL 5.6.17:

mysql -uroot < employees.sql

                   2 node GC cluster 5.6.17 dev mysql 5.6.17

FK ON: 1m32.696s 0m36.379s
FK OFF: 1m1.442s 0m35.025s

=> FK overhead in cluster is roughly 50%