Key and vkey

Key and vkey

The cbstats key and cbstats vkey commands provide information on keys.


The following key information is available.

Stat Description K/V
key_cas The keys current cas value KV
key_data_age How long the key has waited for its KV
value to be persisted (0 if clean) KV
key_exptime Expiration time from the epoch KV
key_flags Flags for this key KV
key_is_dirty If the value is not yet persisted KV
key_valid See description below V
key_vb_state The vbucket state of this key KV

key_valid = can have the following responses:

  • this_is_a_bug - Some case we didn’t take care of.
  • dirty - The value in memory has not been persisted yet.
  • length_mismatch - The key length in memory doesn’t match the length on disk.
  • data_mismatch - The data in memory doesn’t match the data on disk.
  • flags_mismatch - The flags in memory don’t match the flags on disk.
  • valid - The key is both on disk and in memory
  • ram_but_not_disk - The value doesn’t exist yet on disk.
  • item_deleted - The item has been deleted.


Request syntax:

cbstats [hostname]:11210 key [keyname] [vbid]
cbstats [hostname]:11210 vkey [keyname] [vbid]


Example request:

cbstats key foo 115


Example response for key foo:

 key_cas: 41206791218746
 key_exptime: 0
 key_flags: 0
 key_is_dirty: 0