18-12 Oracle Complex Event Processing Visualizer Users Guide
■
To change the scale of a graph, drag the slider next to the vertical axis.
18.2.3 How to Monitor an Oracle Coherence Cache
Using Oracle CEP Visualizer, you can monitor a wide variety of Oracle Coherence cache parameters and graphically compare parameter values to locate and diagnose
performance and operational problems.
Once you have determined the root cause of a problem, you can tune Oracle Coherence parameters to correct the problem. For more information, see
Section 18.2.4, How to Tune Oracle Coherence
.
To monitor an Oracle Coherence Cache: 1.
In the left pane, click the Domain node, where Domain refers to the name of your Oracle CEP domain.
2. In the right pane, click the Coherence tab.
3. In the right pane, click the Cache Chart tab.
The Multi-Nodes Monitor tab appears as Figure 18–1
shows.
Table 18–2 Properties You Can Watch on the Node Detail View Tab
Property Description
Memory Available The total amount of free memory in MB for the selected node.
Memory Max The total amount of memory available in MB for the selected node.
Packets Sent The total number of Oracle Coherence packets sent by the selected node.
Packets Received The total number of Oracle Coherence packets received by the selected node.
Managing Multi-Server Domains 18-13
Figure 18–13 Cache Chart Tab
4. Use the Cache Chart tab to view any combination of the columns that
Table 18–3 lists for one or more selected caches:
■
Check one or more caches in the cache chart.
■
To add a column to the cache chart, check the column in the Columns list.
■
To remove a column from the cache chart, uncheck the column in the Columns list.
■
To change the order of columns, click on the column name in the cache chart and drag left or right.
■
To change the sort order of a column, click the triangle to the right of the column name in the cache chart.
Table 18–3 Columns and Properties for the Cache Chart Tab
Property Description
Cache Name The name of the cache.
of Objects The total number of objects in the selected cache.
Cache Hits The total number times an Oracle Coherence cache client has accessed the
selected cache. Cache Misses
The total number times an Oracle Coherence cache client has accessed the selected cache and failed to find the desired object.
18-14 Oracle Complex Event Processing Visualizer Users Guide
5.
Use the Cache Chart tab to compare any combination of the properties that Table 18–3
lists for one or more selected caches:
■
Check one or more caches in the cache chart.
■
Drag a property from the Drag Property to Watch area to either graph to watch that property or, select the property and click Add to Left or Add to
Right .
You may specify at most one property per graph.
■
A line is drawn for each selected cache. The legend below the graph distinguishes graph data for each selected cache by color.
■
To watch a different property, drag the new property and drop it onto the graph or, select a different property and click Add to Left or Add to Right.
■
To change the scale of a graph, drag the slider next to the vertical axis.
Cache Prunes The total number times Oracle Coherence has reached its maximum size and
had to delete some objects to return to a configured smaller size for the selected cache.
Store Writes The total number of times Oracle Coherence has written to the selected
cache’s backing store. Store Reads
The total number of times Oracle Coherence has read from the selected cache’s backing store.
Node Id The node identifier for the selected cache.
Store Failures The total number of times the selected cache’s backing store has failed to
service an Oracle Coherence Store Write or Store Read. Average Hit Millis
The average time in milliseconds taken by Oracle Coherence to find an object in the selected cache.
Average Get Millis The average time in milliseconds taken by Oracle Coherence to retrieve an
object from the selected cache. Average Miss Millis
The average time in milliseconds taken by Oracle Coherence to determine that an object does not exist in the selected cache.
Average Put Millis The average time in milliseconds taken by Oracle Coherence to add a new
object to the selected cache. Cache Hits Millis
The total time in milliseconds taken by Oracle Coherence to find an object in the selected cache.
Cache Misses Millis The total time in milliseconds taken by Oracle Coherence to determine that
an object does not exist in the selected cache. Cache Prunes Millis
The total time in milliseconds taken by Oracle Coherence to delete some objects from the selected cache to return to a configured smaller size after
having reached its maximum size. Store Read Millis
The total time in milliseconds taken by Oracle Coherence to read from the selected cache’s backing store.
Store Write Millis The total time in milliseconds taken by Oracle Coherence to write to the
selected cache’s backing store. Total Gets Millis
The total time in milliseconds taken by Oracle Coherence to retrieve objects from the selected cache.
Total Puts Millis The total time in milliseconds taken by Oracle Coherence to add new objects
to the selected cache.
Table 18–3 Cont. Columns and Properties for the Cache Chart Tab
Property Description
Managing Multi-Server Domains 18-15
18.2.4 How to Tune Oracle Coherence
Using Oracle CEP Visualizer, you can view and modify a variety of Oracle Coherence parameters to fine tune Oracle Coherence performance.
To determine the root cause of a problem, you can monitor Oracle Coherence parameters. For more information, see:
■
Section 18.2.2, How to Monitor Nodes in an Oracle Coherence Cluster
■
Section 18.2.3, How to Monitor an Oracle Coherence Cache .
