MySQL 5.7 Release Notes
The next few sections contain information about
NDB node configuration parameters and
NDB-specific mysqld options and variables that
have been added to, deprecated in, or removed from NDB 7.6.
The following node configuration parameters have been added in NDB 7.6.
EnablePartialLcp: Enable partial LCP (true); if this is disabled (false), all LCPs write full checkpoints. Added in NDB 7.6.4.EnableRedoControl: Enable adaptive checkpointing speed for controlling redo log usage. Added in NDB 7.6.7.InsertRecoveryWork: Percentage of RecoveryWork used for inserted rows; has no effect unless partial local checkpoints are in use. Added in NDB 7.6.5.LocationDomainId: Assign this API node to specific availability domain or zone. 0 (default) leaves this unset. Added in NDB 7.6.4.LocationDomainId: Assign this management node to specific availability domain or zone. 0 (default) leaves this unset. Added in NDB 7.6.4.LocationDomainId: Assign this data node to specific availability domain or zone. 0 (default) leaves this unset. Added in NDB 7.6.4.MaxFKBuildBatchSize: Maximum scan batch size to use for building foreign keys. Increasing this value may speed up builds of foreign keys but impacts ongoing traffic as well. Added in NDB 7.6.4.MaxReorgBuildBatchSize: Maximum scan batch size to use for reorganization of table partitions. Increasing this value may speed up table partition reorganization but impacts ongoing traffic as well. Added in NDB 7.6.4.MaxUIBuildBatchSize: Maximum scan batch size to use for building unique keys. Increasing this value may speed up builds of unique keys but impacts ongoing traffic as well. Added in NDB 7.6.4.ODirectSyncFlag: O_DIRECT writes are treated as synchronized writes; ignored when ODirect is not enabled, InitFragmentLogFiles is set to SPARSE, or both. Added in NDB 7.6.4.PreSendChecksum: If this parameter and Checksum are both enabled, perform pre-send checksum checks, and check all SHM signals between nodes for errors. Added in NDB 7.6.6.PreSendChecksum: If this parameter and Checksum are both enabled, perform pre-send checksum checks, and check all TCP signals between nodes for errors. Added in NDB 7.6.6.RecoveryWork: Percentage of storage overhead for LCP files: greater value means less work in normal operations, more work during recovery. Added in NDB 7.6.4.SendBufferMemory: Bytes in shared memory buffer for signals sent from this node. Added in NDB 7.6.6.ShmSpinTime: When receiving, number of microseconds to spin before sleeping. Added in NDB 7.6.6.UseShm: Use shared memory connections between this data node and API node also running on this host. Added in NDB 7.6.6.WatchDogImmediateKill: When true, threads are immediately killed whenever watchdog issues occur; used for testing and debugging. Added in NDB 7.6.7.
The following node configuration parameters have been deprecated in NDB 7.6.
BackupDataBufferSize: Default size of databuffer for backup (in bytes). Deprecated in NDB 7.6.4.BackupMaxWriteSize: Maximum size of file system writes made by backup (in bytes). Deprecated in NDB 7.6.4.BackupWriteSize: Default size of file system writes made by backup (in bytes). Deprecated in NDB 7.6.4.IndexMemory: Number of bytes on each data node allocated for storing indexes; subject to available system RAM and size of DataMemory. Deprecated in NDB 7.6.2.Signum: Signal number to be used for signalling. Deprecated in NDB 7.6.6.
The following system variables, status variables, and server options have been added in NDB 7.6.
Ndb_system_name: Configured cluster system name; empty if server not connected to NDB. Added in NDB 5.7.18-ndb-7.6.2.ndb-log-fail-terminate: Terminate mysqld process if complete logging of all found row events is not possible. Added in NDB 5.7.29-ndb-7.6.14.ndb-log-update-minimal: Log updates in minimal format. Added in NDB 5.7.18-ndb-7.6.3.ndb_row_checksum: When enabled, set row checksums; enabled by default. Added in NDB 5.7.23-ndb-7.6.8.
No system variables, status variables, or server options have been deprecated in NDB 7.6.