NDB Cluster Configuration Files Number of seconds to wait before detecting a timeout during schema distribution. This can indicate that other SQL nodes are experiencing excessive activity, or that they are somehow being prevented from acquiring necessary resources at this time. Allow upgrading of the schema distribution table when connecting to  NDB . When true (the default), this change is deferred until all SQL nodes have been upgraded to the same version of the NDB Cluster software. The performance of the schema distribution may be somewhat degraded until the upgrade has been performed. 4190 • ndb_show_foreign_key_mock_tables • ndb_schema_dist_upgrade_allowed Note System Variable ndb_schema_dist_timeout Scope Global Dynamic No SET_VAR  Hint Applies No Type Integer Default Value 120 Minimum Value 5 Maximum Value 1200 Unit seconds Command-Line Format --ndb-schema-dist-upgrade- allowed=value Introduced 8.0.17-ndb-8.0.17 System Variable ndb_schema_dist_upgrade_allowed Scope Global Dynamic No SET_VAR  Hint Applies No Type Boolean Default Value true Command-Line Format --ndb-show-foreign-key-mock- tables[={OFF|ON}] System Variable ndb_show_foreign_key_mock_tables Scope Global Dynamic Yes SET_VAR  Hint Applies No Type Boolean