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12.2. Metrics
The hierarchical database can capture a number of different measurements, called metrics , and these are broken into two categories: duration-based metrics (how long something takes) and simple value metrics.
Duration metrics are represented by the
org.modeshape.jcr.api.monitor.DurationMetric enumeration, and include:
|
Metric
|
Description
|
|---|---|
|
Query execution time
|
The amount of time required to execute a query.
|
|
Session duration
|
The length of time that a session is used before being closed.
|
|
Sequencer duration
|
The length of time required to sequence a node, produce the output, and save the changes to the workspace.
|
Value metrics are represented by the
org.modeshape.jcr.api.monitor.ValueMetric enumeration, and include:
|
Metric
|
Style
|
Description
|
|---|---|---|
|
Active sessions
|
continuous
|
The number of active sessions.
|
|
Active queries
|
continuous
|
The number of active queries.
|
|
Workspace count
|
continuous
|
The number of workspaces.
|
|
Session-scoped locks
|
continuous
|
The number of session-scoped locks held by clients.
|
|
Open-scoped locks
|
continuous
|
The number of open-scoped locks held by clients.
|
|
Listener count
|
continuous
|
The number of listeners registered with active sessions.
|
|
Event queue size
|
continuous
|
The number of events that are enqueued for processing and sending to listeners.
|
|
Event count
|
incremental
|
The number of events that have been sent to at least one listener.
|
|
Changed nodes
|
incremental
|
The number of nodes that were created, updated, or deleted.
|
|
Session saves
|
incremental
|
The number of
Session.save() calls.
|
|
Sequencer queue size
|
continuous
|
The number of sequencing operations that are enqueued.
|
|
Sequenced nodes
|
incremental
|
The number of nodes sequenced.
|
Values for each of these metrics is captured every 5 seconds, where the continuous metrics are recorded as is (the values continue from one measurement to the next), while the incremental metrics represent distinct perturbations (or increments) from 0.
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