MySQL Cluster alerts

[Bheemsen Aitha]

Hi list

I am frequently seeing the following alerts in our production MySQL Cluster
 environment. Does anyone have any metrics, guidelines and scripts to
monitor and fix these alerts? Any help is appreciated.

Temporary Tables To Disk Ratio Excessive
Excessive Disk Temporary Table Usage Detected

Table Scans Excessive
Indexes Not Being Used Efficiently

Thread Cache Size May Not Be Optimal

Cluster DiskPageBuffer Hit Ratio Is Low

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*Thanks*
*BA*