sow

Clicking the sow link will list all available topics in the SOW for this AMPS instance. Selecting a single topic will list the following available statistics about the topic:

Element

Description

Type

delete_count

Number of deletes processed by the SOW.

cumulative

deletes_per_sec

Number of deletes per second processed by the SOW.

interval average

device

Device the topic is stored on, if applicable.

fixed

historical_granularity

The granularity at which the SOW maintains history for this topic (if set).

fixed

historical_window

The window for which the SOW maintains history for this topic (if set).

fixed

insert_count

Count of the number of new records inserted into this topic.

cumulative

inserts_per_sec

Rate of inserts into this topic.

interval average

memory_bytes

The number of bytes of memory used for this topic.

This metric includes:

  • messages stored in the topic

  • metadata for the messages in the topic

  • indices for the topic (both memo indices and hash indices)

Notice that, particularly when the topic is heavily indexed, this can be larger than the message size. Indices are not persisted, so this can also be larger than the space used for persisting the topic data.

See the section on Estimating AMPS Instance Memory Usage for details.

snapshot

mmaps

The number of memory maps used for this topic in the SOW.

snapshot

message_type

Message type for this topic.

fixed

path

File system location of the SOW topics file store.

fixed

queries_per_sec

Rate of queries for this SOW topic.

interval average

query_count

Number of queries processed for this topic.

cumulative

record_size

Record size for the topic in the SOW.

For SOW files created with current versions of AMPS, this will always return the same value.

fixed

resident_percent

Percentage of the storage of this topic that is currently resident in memory.

snapshot

slab_count

The total number of slabs allocated for this SOW topic.

snapshot

slab_size

The slab size for this SOW topic.

fixed

stored_bytes

Number of bytes stored for this topic.

snapshot

topic

Name of this SOW topic.

fixed

update_count

Number of updates to existing records processed by this topic.

cumulative

updates_per_sec

Number of updates to existing records per second.

interval average

valid_keys

Number of distinct messages in the SOW - defined by the SOW topic key.

For topics that maintain a history, this shows the total number of messages that the SOW maintains, which may be larger than the number of messages that would be returned by a query at the current time, or the number of messages that would be returned by a query at a historical point in time.

snapshot

Statistics Database Tables: ISOW_STATIC, ISOW_DYNAMIC

Admin Path: /amps/instance/sow/<identifier>/<metric>

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