Page Comparison

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The Performance Dashboard was removed from XperienCentral in version R28. Use the Administrative Pages instead.

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The XperienCentral Performance Dashboard provides detailed information about how the parts of XperienCentral's infrastructure are functioning. Because XperienCentral is a complex system, the interaction between many different sub-systems and configuration options has a direct impact on how it performs. Using the Performance Dashboard, system administrators, developers, and application managers can quickly identify problems and then make the necessary configuration changes to ensure that XperienCentral performs optimally. The Performance Dashboard measures the speed and response time of page requests and internal queries as well as other settings that affect how XperienCentral runs and rates the results according to the optimal expected results.

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Notes:

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In a clustered environment, the statistics shown in the Performance Dashboard are only for the node/instance/server on which the Performance Dashboard is running, not the whole environment. The Monitoring Dashboard allows you to inspect most of the metrics shown in the Performance Dashboard and is also configurable. The Administrative Pages are also useful for closely examining the performance of processes and events within XperienCentral.

To open the Performance Dashboard, navigate to Configuration > Performance Dashboard.

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For caching, the following indicators related to performance are provided. In the "Status" column, you can click the orange and red indicators for more information on the meaning of the indicator itself and what you can do in order to improve the performance for the related item.

Response Time

For response times, the following indicators related to performance are shown. In the "Status" column, you can click the orange and red indicators for more information on the meaning of the indicator itself and what you can do in order to improve the performance for the related item.The values listed are those that have been measured since the last time the list was cleared.

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To enable monitoring for web pages and/or pages generated by the Page Generator pages, select "Monitoring enabled".

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These options are not persisted — Monitoring is enabled for the current session only. If the Tomcat server is restarted, these checkboxes are cleared. Enabling page response time monitoring can affect XperienCentral performance. Monitoring should not be constantly enabled.

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Use the Queries tab to monitor and examine the queries that have taken the most time (the slowest). To enable query monitoring, select "Monitoring enabled":

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The enabling of SQL query monitoring is not a persisted setting — Monitoring is enabled for the current session only. If the Tomcat server is restarted, the "Enable monitoring" checkbox is cleared. Enabling SQL query monitoring directly affects XperienCentral performance. Monitoring should not be constantly enabled.

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If caching is enabled in XperienCentral, a green indicator is shown and if it is disabled, a red indicator is shown. Caching allows XperienCentral to handle the load created by many page requests by using an intelligent mechanism that returns pages without having to regenerate them completely every time they are requested. In all cases, caching improves website performance and it is highly recommended that you enable it for your website.

To enable/disable caching, navigate to the Setup Tool. On the General tab, navigate to the "frontend_system_settings" section and select allow_cache:

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The caching module of XperienCentral stores a timestamp in the timestamp database for each cached web page. This timestamp is needed in order to determine whether the web page needs to be regenerated or whether it can be retrieved from the cache. For high volume websites, the number of web page requests per second can be so high that even the relatively simple task of performing one SQL query to retrieve this timestamp from the database can cause a bottleneck. If this exceeds 500 milliseconds, it may indicate a performance issue.

To prevent timestamp retrieval from becoming a bottleneck, timestamps can be cached in memory for <n> milliseconds. Note that this also causes a delay of <n> milliseconds; during the <n> milliseconds, modified web pages will not be regenerated. It is recommended that you set timestamp caching to at least 5000 milliseconds (5 seconds).  If you set timestamp caching to fewer than 5000 milliseconds, this can cause database bottlenecks especially for websites that experience a large number of page requests.

Timestamp caching is configured in the XperienCentral Setup Tool. Navigate to the "frontend_system_settings" section of the General (R30 and older) tab:

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Lowering Page Response Times

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To enable/disable the XperienCentral debug options that affect performance, navigate to the Setup Tool. On the General (R30 and older) tab, navigate to "development_settings". Clear the checkbox for enable_debug_messages. In a production environment, the setting enable_view_resolve_cache should be selected.

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For more information on logging events in XperienCentral, see the Log administrative page.

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Creating Custom Performance Indicator Tabs

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