Database Operations

Evicted objects/sec

Number of objects evicted from the database per second.

Objects are evicted from the database according to the [eviction policy]({{< relref "/operate/rs/7.4/databases/memory-performance/eviction-policy" >}}).

Object information is not measured during [shard migration]({{< relref "/operate/rs/7.4/databases/configure/replica-ha" >}}).

Components measured: Database and Shard

Expired objects/sec

Number of expired objects per second.

Object information is not measured during [shard migration]({{< relref "/operate/rs/7.4/databases/configure/replica-ha" >}}).

Components measured: Database and Shard

Hit ratio

Ratio of the number of operations on existing keys out of the total number of operations.

Components measured: Database and Shard

Read misses/sec

The number of read operations per second on keys that do not exist.

Read misses are not measured during [shard migration]({{< relref "/operate/rs/7.4/databases/configure/replica-ha" >}}).

Components measured: Database

Write misses/sec

Number of write operations per second on keys that do not exist.

Write misses are not measured during [shard migration]({{< relref "/operate/rs/7.4/databases/configure/replica-ha" >}}).

Components measured: Database and Shard

Latency

The total amount of time between sending a Redis operation and receiving a response from the database.

The graph shows average, minimum, maximum, and last latency values for all latency metrics.

Components measured: Database

Reads latency

Latency of read operations.

Components measured: Database

Writes latency

Latency per write operation.

Components measured: Database

Other commands latency

Latency of other operations.

Components measured: Database

Ops/sec

Number of total operations per second, which includes read operations, write operations, and other operations.

Components measured: Cluster, Node, Database, and Shard

Reads/sec

Number of total read operations per second.

To find out which commands are read operations, run the following command with [redis-cli]({{< relref "/operate/rs/7.4/references/cli-utilities/redis-cli" >}}):

ACL CAT read

Components measured: Database

Writes/sec

Number of total write operations per second.

To find out which commands are write operations, run the following command with [redis-cli]({{< relref "/operate/rs/7.4/references/cli-utilities/redis-cli" >}}):

ACL CAT write

Components measured: Database

Pending writes min

Minimum number of write operations queued per [Active-Active]({{< relref "/operate/rs/7.4/databases/active-active" >}}) replica database.

Pending writes max

Maximum number of write operations queued per [Active-Active]({{< relref "/operate/rs/7.4/databases/active-active" >}}) replica database.

Other commands/sec

Number of operations per second that are not read operations or write operations.

Examples of other operations include [PING]({{< relref "/commands/ping" >}}), [AUTH]({{< relref "/commands/auth" >}}), and [INFO]({{< relref "/commands/info" >}}).

Components measured: Database

Total keys

Total number of keys in the dataset.

Does not include replicated keys, even if [replication]({{< relref "/operate/rs/7.4/databases/durability-ha/replication" >}}) is enabled.

Total keys is not measured during [shard migration]({{< relref "/operate/rs/7.4/databases/configure/replica-ha" >}}).

Components measured: Database