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Let ALTER TABLE  and other DDL statements use copying operations on NDB  tables. Set to OFF  to keep this from happening; doing so may improve performance of critical applications. 

• --ndb-batch-size= # 

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This sets the size in bytes that is used for NDB transaction batches. 

• --ndb-cluster-connection-pool= # 

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By setting this option to a value greater than 1 (the default), a mysqld  process can use multiple connections to the cluster, effectively mimicking several SQL nodes. Each connection requires its own [api]  or [mysqld]  section in the cluster configuration ( config.ini ) file, and counts against the maximum number of API connections supported by the cluster. 

Suppose that you have 2 cluster host computers, each running an SQL node whose mysqld  process was started with --ndb-cluster-connection-pool=4 ; this means that the cluster must have 8 API slots available for these connections (instead of 2). All of these connections are set up when the SQL node connects to the cluster, and are allocated to threads in a round-robin fashion. 

