Oracle 5.0 Reference Manual page 1689

Events
ERROR
These events relate to Cluster errors and warnings. The presence of one or more of these generally
indicates that a major malfunction or failure has occurred.
Event
Dead due to missed heartbeat
Transporter errors
Transporter warnings
Missed heartbeats
General warning events
Events
INFO
These events provide general information about the state of the cluster and activities associated with
Cluster maintenance, such as logging and heartbeat transmission.
Event
Sent heartbeat
Create log bytes
General information events
17.5.6.3. Using
CLUSTERLOG STATISTICS
The management client's
NDB
statistics in its output. Counters providing information about the state of the cluster are updated at 5-
second reporting intervals by the transaction coordinator (TC) and the local query handler (LQH), and
written to the cluster log.
Transaction coordinator statistics.
chosen by one of the following methods:
• In a round-robin fashion
• By communication proximity
All operations within the same transaction use the same transaction coordinator, which reports the
following statistics:
•
Trans count.
transaction coordinator. Any of these transactions may have committed, have been aborted, or
remain uncommitted at the end of the reporting interval.
Event Reports Generated in MySQL Cluster
Priority
8
2
8
8
2
Priority
12
11
2
CLUSTERLOG STATISTICS
Each transaction has one transaction coordinator, which is
Note
You can determine which TC selection method is used for transactions started
from a given SQL node using the
system variable. For more information, see
System Variables".
This is the number transactions started in the last interval using this TC as the
Note
Transactions do not migrate between TCs.
Severity Description
Node declared "dead" due to missed
ALERT X
heartbeat
ERROR
WARNING
Node missed heartbeat
WARNING X
WARNING
Severity Description
Heartbeat sent to node
INFO
Log part, log file, MB
INFO
INFO
in the MySQL Cluster Management Client
command can provide a number of useful
ndb_optimized_node_selection
Section 17.3.4.3, "MySQL Cluster
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