MySQL 5.6 Reference Manual Including MySQL NDB Cluster 7.3-7.4 Reference Guide
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 7.3.
The following node configuration parameters have been added in NDB 7.3.
ConnectBackoffMaxTime
:
Specifies longest time in milliseconds (~100ms resolution)
to allow between connection attempts to any given data node
by this API node. Excludes time elapsed while connection
attempts are ongoing, which in worst case can take several
seconds. Disable by setting to 0. If no data nodes are
currently connected to this API node,
StartConnectBackoffMaxTime is used instead. Added in NDB
7.3.7.
DiskPageBufferEntries
:
Memory to allocate in DiskPageBufferMemory; very large disk
transactions may require increasing this value. Added in NDB
7.3.8.
HeartbeatIntervalMgmdMgmd
:
Time between management-node-to-management-node heartbeats;
connection between management nodes is considered lost after
3 missed heartbeats. Added in NDB 7.3.3.
LcpScanProgressTimeout
:
Maximum time that local checkpoint fragment scan can be
stalled before node is shut down to ensure systemwide LCP
progress. Use 0 to disable. Added in NDB 7.3.3.
RestartSubscriberConnectTimeout
:
Amount of time for data node to wait for subscribing API
nodes to connect. Set to 0 to disable timeout, which is
always resolved to nearest full second. Added in NDB 7.3.6.
StartConnectBackoffMaxTime
:
Same as ConnectBackoffMaxTime except that this parameter is
used in its place if no data nodes are connected to this API
node. Added in NDB 7.3.7.
TimeBetweenGlobalCheckpointsTimeout
:
Minimum timeout for group commit of transactions to disk.
Added in NDB 7.3.9.
The following node configuration parameters have been deprecated in NDB 7.3.
ReservedSendBufferMemory
:
This parameter is present in NDB code but is not enabled.
Deprecated as of NDB 7.3.1.
The following system variables, status variables, and server options have been added in NDB 7.3.
Ndb_last_commit_epoch_server
:
Epoch most recently committed by NDB. Added in NDB 7.3.8.
Ndb_last_commit_epoch_session
:
Epoch most recently committed by this NDB client. Added in
NDB 7.3.8.
Ndb_slave_max_replicated_epoch
:
Most recently committed NDB epoch on this replica. When this
value is greater than or equal to
Ndb_conflict_last_conflict_epoch, no conflicts have yet been
detected. Added in NDB 7.3.8.
create_old_temporals
:
Use pre-5.6.4 storage format for temporal types when
creating tables. Intended for use in replication and
upgrades/downgrades between NDB 7.2 and NDB 7.3/7.4. Added
in NDB 7.3.10.
ndb_eventbuffer_max_alloc
:
Maximum memory that can be allocated for buffering events by
NDB API. Defaults to 0 (no limit). Added in NDB 7.3.3.
ndb_recv_thread_activation_threshold
:
Activation threshold when receive thread takes over polling
of cluster connection (measured in concurrently active
threads). Added in NDB 7.3.1.
ndb_recv_thread_cpu_mask
:
CPU mask for locking receiver threads to specific CPUs;
specified as hexadecimal. See documentation for details.
Added in NDB 7.3.1.
ndb_show_foreign_key_mock_tables
:
Show mock tables used to support foreign_key_checks=0. Added
in NDB 7.3.2.
The following system variables, status variables, and options have been deprecated in NDB 7.3.
create_old_temporals
:
Use pre-5.6.4 storage format for temporal types when
creating tables. Intended for use in replication and
upgrades/downgrades between NDB 7.2 and NDB 7.3/7.4.
Deprecated as of NDB 7.3.10.
The following system variables, status variables, and options have been removed in NDB 7.3.
ndb_index_stat_cache_entries
: Granularity
of statistics by determining number of starting and ending
keys. Removed in NDB 7.3.5.
ndb_index_stat_update_freq
: How often to
query data nodes rather than statistics cache. Removed in
NDB 7.3.5.