performancenosqlcouchbasemembase

membase(couchbase) stats(cbstats) show 70% of get_misses

I am using couchbase 1.8.1. This is the output cbstats command

ubuntu@ip-10-128-117-9:~$ /MEMBASEDATA/opt/couchbase/bin/cbstats localhost:11210 all | egrep "hit|miss"
 cas_hits:                       0
 cas_misses:                     0
 decr_hits:                      0
 decr_misses:                    0
 delete_hits:                    76
 delete_misses:                  78
 get_hits:                       636552
 get_misses:                     1450283
 incr_hits:                      0
 incr_misses:                    0

it is showing very high number of misses. but when I check in web console, miss ratio is almost 0. web console showing 0 miss ratio Does it mean there is something wrong? If yes, is there any way to know what keys are being missed, so that I can investigate my code.

Solution

  • get_misses actually refers to the number of times a requested document was not found, and in fact not the number of cache misses. That stat is given by ep_bg_fetched.

    http://docs.couchbase.com/admin/admin/Concepts/bp-maintenance.html