Reference Guide

Zend Server Reference Manual
Slow Request Execution
Description: When a specific request runs longer then a specified duration it generates an event. The
“Slow Request Execution” Rules contains the durations that trigger events either severe or normal and
either relative to a specific value (absolute) or to a percentage (relative measurement per URL).
Information Collected:
The most important details are:
426
URL - As displayed in the Issue’s General Details
Request data - Listed in the Request.
In most cases, these details alone should be enough to indicate what happened to trigger an event.
Applicable Diagnostic Actions:
Click on a link to see how to perform each action tools are listed in order of relevance to helping solve the
event:
Run the Profiler
Open code in editor
Run the Debugger
View information in the Logs
Run general diagnostics on the machine's performance in terms of memory and CPU usage.
Use URL Tracing to collect further information about this function in action.
Possible Causes and Solutions:
Slow requests in general indicate that there is a performance problem and they generally appear when
there is a heavy load, which in turn causes Web applications to perform poorly.
Check the following:
Bottlenecks caused by un-optimized queries or multiple queries, such as un-joined queries, slow queries
and multiple short queries. Use the Profiler to see how many queries are running at the same time or set
thresholds to find queries that take a long time to run.
Check to see if a different CPU intensive process was running in the background taking up the CPU and
making everything run slowly.
Look at the amount of calls to the function - are there too many? add breakpoints and run again to
manually trace per query what happened. Possible Solution: cache the information using a Data Cache
API as a PHP array or use the Page Cache to cache the presentation layer.
Profiler results - analyze the profiler results and isolate functions/areas that consume the majority of the
time and analyze each function/area code separately to isolate the possible cause of the problem.