NDB Cluster Configuration Files • MaxNoOfSubscribers Version (or later) NDB 8.0.13 Type or units unsigned Default 0 Range 0 - 4294967039 (0xFFFFFEFF) Restart Type N (NDB 8.0.13) This parameter is of interest only when using NDB Cluster Replication. The default value is 0. Prior to NDB 8.0.26, this was treated as  2 * MaxNoOfTables ; beginning with NDB 8.0.26, it is treated as  2 * MaxNoOfTables + 2 * [number of API nodes] . There is one subscription per  NDB  table for each of two MySQL servers (one acting as the replication source and the other as the replica). Each subscriber uses 16 bytes of memory. When using circular replication, multi-source replication, and other replication setups involving more than 2 MySQL servers, you should increase this parameter to the number of  mysqld  processes included in replication (this is often, but not always, the same as the number of clusters). For example, if you have a circular replication setup using three NDB Clusters, with one  mysqld  attached to each cluster, and each of these  mysqld  processes acts as a source and as a replica, you should set  MaxNoOfSubscribers equal to  3 * MaxNoOfTables . For more information, see Section 23.6, “NDB Cluster Replication” . This parameter sets a ceiling on the number of operations that can be performed by all API nodes in the cluster at one time. The default value (256) is sufficient for normal operations, and might need to be adjusted only in scenarios where there are a great many API nodes each performing a high volume of operations concurrently. Boolean parameters.   The behavior of data nodes is also affected by a set of  [ndbd]  parameters taking on boolean values. These parameters can each be specified as  TRUE  by setting them equal to  1  or Y , and as  FALSE  by setting them equal to  0  or  N . Setting this parameter to  1  causes local checkpoint files to be compressed. The compression used is equivalent to  gzip --fast , and can save 50% or more of the space required on the data node to store 4098 • MaxNoOfConcurrentSubOperations Version (or later) NDB 8.0.13 Type or units unsigned Default 256 Range 0 - 4294967039 (0xFFFFFEFF) Restart Type N (NDB 8.0.13) Version (or later) NDB 8.0.13 Type or units boolean Default false Range true, false Restart Type N (NDB 8.0.13) • CompressedLCP