Connected to http://localhost:8086 version 1.8.10
InfluxDB shell version: 1.8.10

# Syntax
# - CREATE RETENTION POLICY <policy_name> ON <database> DURATION <duration> REPLICATION <n> [SHARD DURATION <duration>] [DEFAULT]
#
# DURATION ⇒ retention duration (minimum duration is 1h)
# - unit time
#   - w : week
#   - d : day
#   - h : hour
#
# REPLICATION ⇒ number of data nodes in cluster
#   - set [1] on single node
#   - clustering is not supported on InfluxDB OSS 1.7
#
# SHARD DURATION ⇒ time range covered by a shard group (optional)

# show retention policy
# [autogen] is the default policy that has infinite retention
> show retention policies 
name    duration shardGroupDuration replicaN default
----    -------- ------------------ -------- -------
autogen 0s       168h0m0s           1        true

# create a retention policy which has 1 day retention
> create retention policy "one_day" on "test_database" duration 1d replication 1 

> show retention policies 
name    duration shardGroupDuration replicaN default
----    -------- ------------------ -------- -------
autogen 0s       168h0m0s           1        true
one_day 24h0m0s  1h0m0s             1        false

# set the new policy default
> alter retention policy "one_day" on "test_database" default 

> show retention policies 
name    duration shardGroupDuration replicaN default
----    -------- ------------------ -------- -------
autogen 0s       168h0m0s           1        false
one_day 24h0m0s  1h0m0s             1        true


# change retention for a policy
> alter retention policy "one_day" on "test_database" duration 1w 

> show retention policies 
name    duration shardGroupDuration replicaN default
----    -------- ------------------ -------- -------
autogen 0s       168h0m0s           1        false
one_day 168h0m0s 1h0m0s             1        true

> exit