The Agent Request Overflows alarm becomes active when a request for an agent was made after the limit for the MAXAGENTS database manager configuration parameter was reached. Once this limit is reached, the application begins to search for idle associated agents currently residing in the instance.
This alarm has been predefined with Low and Information severity levels. The underlying metric for this alarm can be adjusted to suit your environment by using the Metric Editor.
Try reducing the workload if the MAXAGENTS limit is exceeded on a regular basis.
Welcome to Spotlight on IBM DB2 LUW (Linux, Unix, and Windows). The help topics in this book cover features available in the interface when Spotlight is connected to a version 9 database.
Spotlight is a powerful database monitoring and diagnostic tool. Its unique user interface provides you with an intuitive, visual representation of the activity on the DB2 databases and database partitions that you choose to monitor. Graphical flows and line and fill graphs illustrate the activity on and between database components. Icons display the value of key statistics. Using the Spotlight browser, you can switch your monitoring focus between the various databases and partitions. Additionally, you can view activity at the DB2 instance level for any of these systems.
The power of Spotlight lies in its ability to provide visual and audible warnings if the performance metrics exceed acceptable thresholds. The components and dataflows on the home page change color to show you the source of the problem.
A range of reports and graphs provide you with detailed information about a DB2 database, database partition, or the instance to which the database belongs. This information can be viewed on the screen or be printed.
You can set Spotlight options to warn you when a threshold is reached. You can define a number of thresholds so that warning messages are displayed well before the traffic levels into or out of databases become critical.
Spotlight uses a number of different techniques to warn you when your DB2 instance or a database is exceeding a threshold. For example, to issue a warning, you can configure Spotlight to change a color on the home page or drilldown, provide an audible signal, or perform an action, such as send an email message.
The number of times that a hash join overflowed available sort heap space by less than 10%. If this number and the number of hash join overflows are both high, try increasing SHEAPTHRES parameters. If the small overflows number is more than 10% of the number of hash join overflows, try increasing the sort heap size.
Note: In a multiple-partition database, information is presented for each active partition on the system. An All Nodes row keeps a running total for all partitions. In a single-partition database, only the All Nodes information is presented.
The predefined Hash Join Small Overflows alarm becomes active when a hash join overflows available sort heap space by less than 10%.
This alarm has been predefined with a Low severity level. The underlying metric for this alarm can be adjusted to suit your environment by using the Metric Editor.
If Hash join small overflows and Hash join overflow values are both high, try increasing SHEAPTHRES parameters. If the small overflows number is more than 10% of the number of Hash join overflows, try increasing the SORTHEAP size.