Administering : Expression queues : Expression queue status and statistics
  
Expression queue status and statistics
Server or workspace administrators can maintain and configure workspaces on the Expression Queue State and Statistics page. The page provides important information related to expressions issues. You can use this page to ensure that the server is not affected for certain expression configurations. To get an understanding of the expressions information, look at all the data and consider other factors, such as server restarts. The page shows the status of expressions and is updated automatically every minute. Because resources are required to calculate and update the status and statistics, after you view this page, navigate away from the page to save resources. The table shows the status and statistics of expression queue.
The statistics on this page begin to be measured at the date and time at the top of the page. The date and time are considered in all numbers on this page.
Current Queue State
 
Property
Description
Queued Expressions
Number of expressions in the queue that are waiting to be run
Running Expressions
Number of expressions in the queue that are started but not completed
Concurrent Expression Threads
Number of threads on all nodes that are running the expressions
Expression Queue History Graph
 
Property
Description
Queued
Number of queued expressions over time. This number is displayed as a line in the graph.
Running
Number of running expressions over time. This number is displayed as a line in the graph.
Added
Number of expressions that are added to the queue. This number is displayed as a bar in the graph.
Successful
Number of expressions that ran. This number is displayed as a bar in the graph.
Failed
Number of expressions that ran with errors. This number is displayed as a bar in the graph. A message with details about the error is displayed in the expression holder attribute.
Select the graph horizon by clicking All (displays all history since midnight on the current day), 24 hours, 1 hour, 5 minutes, or 1 minute.
Queue Throughput
 
Property
Description
Successful Evaluations
Number of expressions that ran
Failed Evaluations
Number of expressions that ran with errors
Number of Added or Changed Expressions
The sum of all the new and changed expressions
Queue Efficiency
The lower the numbers are for queue efficiency, the fewer expression container attributes have the Pending Update message.
 
Property
Description
Successful Evaluation Mean Time
The mean time for running an expression
Average Latency
The average time an expression is in the queue before a thread starts to run the expression, regardless of whether errors occurred
Max Latency
The maximum time an expression is in the queue before a thread starts to run the expression, regardless of whether errors occurred
Average Queue Time
The average time to add, run, and complete an expression, regardless of whether errors occurred
Max Queue Time
The maximum time to add, run, and complete an expression, regardless of whether errors occurred
Top 5 Slowest Expressions
The names and configurations of the five expressions in the application that run the slowest.
These statistics are available when you use Postgres, and not when you use DB2 or Oracle databases.
Top 5 Slowest Expressions on Specific Attributes
The names and configurations of the five expressions that run the slowest in certain elements.
These statistics are available when you use Postgres, and not when you use DB2 or Oracle databases.
See
Expression queues