Sunday, January 22, 2012

Enterprise Manager Performs Poorly Or Appears To Hang While Displaying the List of SOA Composites on Composite Dashboard Pages


Symptoms

You have an installation of Oracle Fusion Middleware 11g where you have been running a large volume of BPEL processes over time. When accessing the dashboard page displayed by Enterprise Manager for one or more composites, the regions that display list views of composite's instances take a long time to render and during this time Enterprise Manager remains hung and unresponsive for other tasks.At the time when the performance of Enterprise Manager is impacted, you will likely have one or more composites that have a reasonably large number of composite instances defined (over 100,000) and the performance impact may be most noticeable the first time a dashboard page is accessed following a restart of the AdminServer. In severe cases you may be experiencing very long delays (potentially hours) when using Enterprise Manager to accessing the dashboard pages of these composites.

Cause(As per metalink note [ID 1351032.1])

At the database layer the SQL query that Enterprise Manager executes to obtain the data displayed on the dashboard is taking far longer than expected to execute, as a result of a less than optimal execution plan having been determined by the Cost Based Optimizer component of the database. The execution plan identified by the Cost Based Optimizer is, in turn, driven by information about the various tables and column indexes that is maintained by database statistics. To reduce processing overhead while creating statistics, the statistics for large tables (over 100,000 rows) are not collected from all rows of the table but using a sampling technique on a smaller subset (by default, 20%).

As a result of this sampling based approach, over time the statistics gathered against the sample may not be representative for the larger data set as a whole. When such a discrepancy occurs the unrepresentative statistics can lead the Cost Based Optimizer to identify a bad execution plan that is less efficient on data access and takes significantly longer to complete. In such cases, this causes the source of the long running SQL which so significantly impacts the performance of the list views on Enterprise Manager dashboard pages.


My Solution(Worked fine for me)


1. Login to the SOA 11g EM Console
2. Right Click on SOA-INFRA and go to SOA ADMINISTRATION->COMMON PROPERTIES
3. Enable the Disable fetching of instance and fault count metrics as shown below.
4. Set the Duration Details to 24 or 48 hours as shown below.














5. Now log back to EM console and voila, the EM performance has a sea change. its faster


Explanation
These two properties enable you to perform the following:

  • Disable the fetching of instance and fault count data to improve loading times for the following pages:
    • Dashboard pages of the SOA Infrastructure, SOA composite applications, service engines, and service components
    • Delete with Options: Instances dialog

    These settings disable the loading of all metrics information upon page load. For example, on the Dashboard page for the SOA Infrastructure, the values that typically appear in the Running and Total fields in the Recent Composite Instances section and the Instances column of the Deployed Composites section are replaced with links. When these values are large, it can take time to load this page and other pages with similar information.

  • Specify a default time period that is used as part of the search criteria for retrieving recent instances and faults for display on the following pages:

    • Dashboard pages and Instances pages of the SOA Infrastructure, SOA composite applications, service engines, and service components
    • Dashboard pages of services and references
    • Faults and Rejected Messages pages of the SOA Infrastructure, SOA composite applications, services, and references
    • Faults pages of service engines and service components


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