This extension documentation is now deprecated and will no longer be updated. We recommend using the new Memcached extension for improved functionality and support.
Dynatrace Memcached server monitoring provides insights into your distributed memory-object caching system so that you can pinpoint server performance issues and identify potential bottlenecks.
With Memcached monitoring enabled globally, when a new host running Memcached is detected in your environment Dynatrace automatically collects Memcached metrics.
Dynatrace provides the option of enabling Memcached monitoring for specific hosts rather than globally.
Key Memcached metrics are displayed on each Memcached process page within an intuitive infographic. Click the Memcached metrics and Further details tabs to view deeper insights.
Metric
Description
Cache usage
Percentage of available memory used for Memcached.
Connections
Number of open connections.
Metric
Description
Evictions
Number of valid items removed from cache to free up memory for new items. Evictions indicate that either:
Bytes
Current number of bytes used to store items.
Max bytes
Maximum number of bytes allowed in cache. You can adjust this setting via a config file or the command line while starting your Memcached server.
Current
Number of open connections. There should always be available space for new connections. The default max setting for simultaneous connections is 1024.
Get
Number of GET requests received by server per second.
Set
Number of SET requests received by server per second.
Hits
Number of successful GET requests (items requested and found) per second. The ratio of hits to misses should be as high as possible. Note that this ratio is low following Memcached restart (when the database receives data).
Misses
Number of missed GET requests (items requested but not found) per second. These occur when nothing has been cached for a requested key or the cached value of an object is expired.
Read
Number of bytes per second sent from the network and read by the server.
Written
Number of bytes per second sent by the server to the network.