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20.4 NDB Cluster Advisors

This section describes the expression-based Cluster Advisors.

Cluster Data Node Redo Buffer Space Getting Low

Advises when the redo buffers start to fill up.

Default frequency 00:05:00

Default auto-close enabled no

Cluster Data Node Redo Log Space Getting Low

Advises when the redo log spaces start to fill up.

Default frequency 00:05:00

Default auto-close enabled no

Cluster Data Node Undo Buffer Space Getting Low

Advises when the undo buffers start to fill up.

Default frequency 00:05:00

Default auto-close enabled no

Cluster Data Node Undo Log Space Getting Low

Advises when the undo log spaces start to fill up.

Default frequency 00:05:00

Default auto-close enabled no

Cluster Data Nodes Not Running

Indicates how many data nodes are not running.

Default frequency 00:05:00

Default auto-close enabled no

Cluster DiskPageBuffer Hit Ratio Is Low

Advises when the hit-rate for the DiskPageBuffer falls below a threshold. May happen temporarily after restarting one or more data nodes. This is the average ratio since the last sample period.

Default frequency 00:05:00

Default auto-close enabled no

Cluster Has Stopped

Indicates a cluster has completely stopped.

Default frequency 00:02:00

Default auto-close enabled no


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