Investigating problems with Web and Business tiers
The Web and Business tiers in the Application View provide a visual indication of problems with the performance and availability of application servers, compared to the set Minor . You can use the information presented on the Web and Business tiers (also known as presentation and logic tiers) to identify performance and availability problems in your application. The information presented by the tiers is based on monitoring data from the App Visibility agents.
The assignment of an application server as a Web or Business tier depends how App Visibility Manager recognizes most of the transactions on the server:
- Web: A monitored server where most transactions are Transaction-type requests, that is, the server is the first to receive transaction requests within an application. For example, a web server that mostly receives end-user transaction requests, or a server that mostly receives requests from a non-monitored component (such as a PHP server), is recognized as a Web tier.
- Business: A monitored server where most transactions are Request-type requests, that is, the server receives most requests from a monitored server.
For information about transaction types, see Analyzing business transactions.
This topic presents the following information about the application servers tiers:
Before you begin
To see the Application View tab, your system must include TrueSight App Visibility Manager and you must have -level access, or higher.
Determine if the application has problems in the Web or Business tiers
In the Application View, the Web and Business tiers display the number of servers that have one or more transaction problems (latency violations or errors) during the selected period. The tiers display the following information:
- Impacted Servers (number inside the circle). Number of impacted application servers
- Colored part of the circle. Ratio of impacted application servers to the total number of servers. The color reflects whether the percentage of servers experiencing issues exceeds the defined thresholds.
- Hits per second. Number of hits handled by the servers per second. The type of hit depends on the type of application server, for example, HTTP requests received by a web server, or messages received by a messaging server.
The following example describes the information in the Web and Business tiers:
To select a Web or Business tier for analysis
- On the Application View tab of the Application Monitoring page, position the time slider to select a five-minute period of interest.
- Click the Web or Business tier to display the application servers that were active in the time period.
Example of the Tier Members and Selection Details
In the Tier Members section of the page, click a filter to show or hide application servers with the selected status.
Filters for servers with Critical and Minor events are selected by default to show the servers with detected issues.
Evaluating details of selected servers
Click one or more server names to examine problem details.
For selected servers, the following details are displayed:
Overall issues in the Summary tab
On the Summary tab, you can compare relative values for selected servers. For example, you might want to examine the server with the largest number of hits per second, or with the greatest percentage of latency violations.
For selected servers, the following details are displayed on the Summary tab, below the Tier Members section. Click a column heading to sort entries.
|Action menu||Select Show Business Transactions to examine transaction details|
|Severity icon||Representation of the severity level of events on the server|
|Application Server Name||Name of the application server|
Estimated number of requests sent to the servers per second
Variations in the reported metrics might occur between the values in the tier box and the total of tier members because of the way fractional results are calculated.
Percentage of transactions on the server with latency violations or errors that exceed defined thresholds
Percentage of transactions on the server with latency violations
Percentage of transactions on the server with errors
The following example describes how the status is determined per transaction entry point, and how this can differ for the application or server status.
Examine specific problems with servers
Click the Problems tab to examine the problems detected on the selected servers. Problems include latency violations, errors, and server metrics.
For selected servers, the following details are displayed. Click a column heading to sort entries.
Representation of the problem severity level
The severity level remains unchanged until all transaction and server problems of that level are closed.
Brief description, such as
|Application Server Name|
Name of the application server
Time and date that the problem started which caused the displayed severity
If the problem started earlier than the displayed time, click the start time to reset the time selection. The time slider moves to the five-minute period that includes the problem start time.
For application server metrics, the value of the threshold that was crossed
For transactions, which represent an aggregation of entry points, the threshold value is not applicable (N/A).
Open or Closed, which represents the current status of the problem, and time in which the problem was resolved, if applicable
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