memory

  • reference
    +
    Gets memory-related statistics.

    Syntax

    Request syntax:

    cbstats [host]:11210 memory

    Description

    This command returns a number of memory-related statistics, some of which are for internal use only. Others are listed as follows:

    Stat Description

    bytes

    Engine’s total memory usage.

    ep_kv_size

    Memory used to store item metadata, keys, and values, no matter what the vbucket’s state may be. If an item’s value is ejected, this statistic will be decremented by the size of the item’s value.

    ep_value_size

    Memory used to store values for resident keys.

    ep_overhead

    Extra memory used by transient data; such as persistence queue, replication queues, and checkpoints.

    ep_mem_used_primary

    If this is a magma bucket, this statistic represents the memory usage of the bucket excluding magma. Otherwise, this statistic represents total memory used, in bytes.

    ep_mem_used_secondary

    If this is a magma bucket, this statistic is the memory usage of the storage layer. Otherwise, this statistic is unused, and is zero.

    ep_max_size

    Maximum amount of data allowed in memory.

    ep_mem_low_wat

    Low water mark for auto-evictions.

    ep_mem_high_wat

    High water mark for auto-evictions.

    ep_oom_errors

    Number of times unrecoverable out of memory errors occurred, while processing operations.

    ep_tmp_oom_errors

    Number of times temporary out of memory errors occurred, while processing operations.

    Example

    Request

    /opt/couchbase/bin/cbstats -u Administrator -p password -b travel-sample localhost:11210 memory

    Response

    bytes:                              68505152
     ep_arena:allocated:                 69533504
     ep_arena:arena:                     2
     ep_arena:base:                      958544
     ep_arena:fragmentation_size:        1798336
     ep_arena:internal:                  0
     ep_arena:large.allocated:           1146880
     ep_arena:mapped:                    72466432
     ep_arena:resident:                  71331840
     ep_arena:retained:                  10371072
     ep_arena:small.allocated:           68386624
     ep_arena_global:allocated:          10353984
     ep_arena_global:arena:              0
     ep_arena_global:base:               4922096
     ep_arena_global:fragmentation_size: 6808256
     ep_arena_global:internal:           1153648
     ep_arena_global:large.allocated:    5197824
     ep_arena_global:mapped:             24813568
     ep_arena_global:resident:           17162240
     ep_arena_global:retained:           2973696
     ep_arena_global:small.allocated:    5156160
     ep_blob_num:                        64824
     ep_blob_overhead:                   4247418
     ep_item_num:                        3584
     ep_kv_size:                         48627966
     ep_max_size:                        209715200
     ep_mem_high_wat:                    178257920
     ep_mem_high_wat_percent:            0.85
     ep_mem_low_wat:                     157286400
     ep_mem_low_wat_percent:             0.75
     ep_mem_used_primary:                68505152
     ep_mem_used_secondary:              0
     ep_oom_errors:                      0
     ep_overhead:                        5057152
     ep_storedval_num:                   63288
     ep_storedval_overhead:              4247418
     ep_storedval_size:                  5061344
     ep_tmp_oom_errors:                  0
     ep_value_size:                      44242624
     ht_mem_used_replica:                0
     mem_used:                           68505152
     mem_used_estimate:                  68505152
     mem_used_merge_threshold:           1048576
     replica_checkpoint_memory_overhead: 0