Oracle 5.0 Reference Manual page 1600

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LogLevelCongestion
Effective Version
MySQL 5.0.0
Restart Type: N
The reporting level for events generated by congestion. These errors do not cause node failure but
are still considered worth reporting.
The default level is 0.
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LogLevelInfo
Effective Version
MySQL 5.0.0
Restart Type: N
The reporting level for events generated for information about the general state of the cluster.
The default level is 0.
Backup parameters.
aside for execution of online backups.
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BackupDataBufferSize
Effective Version
MySQL 5.0.0
Restart Type: N
In creating a backup, there are two buffers used for sending data to the disk. The backup data buffer
is used to fill in data recorded by scanning a node's tables. Once this buffer has been filled to the
level specified as
BackupWriteSize
disk, the backup process can continue filling this buffer until it runs out of space. When this happens,
the backup process pauses the scan and waits until some disk writes have completed freed up
memory so that scanning may continue.
The default value is 2MB.
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BackupLogBufferSize
Effective Version
MySQL 5.0.0
Restart Type: N
The backup log buffer fulfills a role similar to that played by the backup data buffer, except that
it is used for generating a log of all table writes made during execution of the backup. The same
principles apply for writing these pages as with the backup data buffer, except that when there is no
more space in the backup log buffer, the backup fails. For that reason, the size of the backup log
buffer must be large enough to handle the load caused by write activities while the backup is being
made. See Section 17.5.3.3, "Configuration for MySQL Cluster
MySQL Cluster Configuration Files
Type/Units
levelr
Type/Units
integer
The parameters discussed in this section define memory buffers set
[ndbd]
Type/Units
bytes
(see below), the pages are sent to disk. While flushing data to
Type/Units
bytes
1580
Default
0
Default
0
Default
2M
Default
2M
Backups".
Range/Values
0 - 15
Range/Values
0 - 15
Range/Values
0 - 4G
Range/Values
0 - 4G