Activity Page
Note: Available for Oracle 10.2 and later.
The Services | Activity page provides an overview of the activity for services deployed on the Oracle RAC cluster.
To open the Activity page
- Select the Spotlight on Oracle RAC connection in the Spotlight Browser.
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Click Services | Activity.
- Select a Service to view the activity for.
Charts on the Activity page
Notes:
- Every chart has a legend (list of symbols) to its right that describes the various series (line graphs) on the chart.
- Click an item in the legend to highlight its series (line) in the chart. Click a second time to return the series to its normal appearance.
- Move the mouse pointer over an item in the legend to view the current value for that series within the chart.
| Logical I/O |
For the selected service, Logical I/O shows the rate of logical database I/O on the Oracle RAC cluster. The chart shows the following data:
- Logical Reads - The rate (in IO/s) of logical reads for the Oracle RAC cluster.
- Block Changes - The number of database blocks in memory (SGA) that are modified per second.
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| Physical I/O |
For the selected service, Physical I/O shows I/O rates of physical reads and writes on the Oracle RAC cluster. The chart shows the following data:
- Physical Reads - The rate of reads from the datafiles, measured in disk I/O per second.
- Physical Writes - The rate of writes to the datafiles, measured in disk I/O per second.
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| Time Breakdown |
For the selected service, Time Breakdown breaks down activity (in milliseconds per second) according to the following categories:
- Application - The rate at which time is spent on waits related to user application code.
- CPU - The rate at which time is spent in database user calls.
- Cluster - The rate at which time is spent on waits related to Oracle RAC resources.
- IO - The rate at which time is spent waiting for user I/O.
- Concurrency - The rate at which time is spent waiting for internal database resources.
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| Sessions |
For the selected service, Sessions shows the number of sessions connected to the database. The types of sessions are:
- Idle - Sessions that are not currently engaged in database activity.
- Active - Sessions that are currently performing some database activity.
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| Call Rates |
For the selected service, Call Rates shows the rate of database calls made to all connected sessions. The call rates shown are:
- Parse - The rate at which requests to prepare SQL statements for execution are made to all connected sessions.
- Execute - The rate of executions made to all connected sessions in order to prepare a query to receive rows.
- Commit - The rate of Commit calls made to all connected sessions.
- Rollback - The rate of Rollback calls made to all connected sessions.
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| Cluster Block Transfers |
For the selected service, Cluster Block Transfers shows the rate of successful block transfers for CR (consistent read) blocks and current blocks between instances. The transfer rates shown are:
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CR Blocks - The rate of transfer for consistent read blocks between instances.
A consistent read is a read from global cache for a block that is consistent at a point in time across all instances, and so keeps inserts or updates that occur during a query from changing the result.
When a consistent read requires access to rows that have changed since the query began, these rows are accessed from rollback segments.
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Current Blocks - The rate of transfer for current blocks between instances.
A current read is a read from global cache of the most recently updated version of a data block. Current reads also occur for internal operations such as reading the header block during a table scan. |
Related Topics
Spotlight on Oracle RAC Drilldowns
