Merge statistics

Purpose

Merge statistics will indicate the performance of the system in persisting changes. This monitor will check for the time taken by the merge operation applied on each table to detect any performance drop in the merge operations

Configuration hints

You can customize the monitoring by setting filters on the host, the schema and the table The monitor will look for merge operations that happened since a time configurable in the “period” field Any merge operation longer than threshold will trigger an alarm if the host, schema and table match the filter.

Surveillance table

Parameter	Description
Active	If checked, the rule is enabled and will be processed
Host	Can be used to restrict the monitoring to a given host (multi instance case). A star (‘*’) will match any host
Schema	Can be used to restrict the monitoring on the tables within a given schema. A star (‘*’) will match any schema
Table	Can be used to restrict the monitoring on a given table. A star (‘*’) will match any table
Threshold (sec)	The maximum delta merges time before sending an alarm
Period (min)	The period of time in the past (computed from now) to look for merge operations
Aggregate	If checked, one alarm will be sent indicating the number of merge operations reaching the threshold. If not checked, one alarm per merge operation will be sent
Severity	Defines the level of severity of the alarm that will be generated if one of the thresholds is reached
Auto clear	If set, the generated alarms will be automatically cleared from the console if the alarm condition is not fulfilled anymore
Alarm tag	You can define some text to use as a prefix of the alarm message generated by the current rule
Alarm	Defines if an alarm has to be generated for the given rule
Metric	Defines if a metric has to be generated for the given rule

Generated metrics

metricId	metricUnit	metricTarget	metricDescription
MERGE_STATISTICS_TIME	Seconds	SCHEMA.TABLE	Sends the average time taken by merge operations within a period, for a given table
MERGE_STATISTICS_COUNT	Occurence	SCHEMA.TABLE	Sends the number of merge operations occurred for a given table within a period.