Database Management

InfluxQL offers a full suite of administrative commands.

• Data management
     ◦      Create a database with CREATE DATABASE
     ◦      Delete a database with DROP DATABASE
     ◦      Drop series from the index with DROP SERIES
     ◦      Delete series with DELETE
     ◦      Delete measurements with DROP MEASUREMENT
     ◦      Delete a shard with DROP SHARD

• Retention policy management
     ◦      Create retention policies with CREATE RETENTION POLICY
     ◦      Modify retention policies with ALTER RETENTION POLICY
     ◦      Delete retention policies with DROP RETENTION POLICY

If you’re looking for SHOW queries (for example, SHOW DATABASES or SHOW RETENTION POLICIES), see Schema Exploration.

The examples in the sections below use InfluxDB’s Command Line Interface (CLI). You can also execute the commands using the HTTP API; simply send a GET request to the /query endpoint and include the command in the URL parameter q. See the Querying Data guide for more on using the HTTP API.

Note: When authentication is enabled, only admin users can execute most of the commands listed on this page. See the documentation on authentication and authorization for more information.

Data Management

Create a database with CREATE DATABASE

The CREATE DATABASE query takes the following form:

CREATE DATABASE [IF NOT EXISTS] <database_name> [WITH [DURATION <duration>] [REPLICATION <n>] [SHARD DURATION <duration>] [NAME <retention-policy-name>]]

Note: The IF NOT EXISTS clause does nothing, is deprecated, and will be removed in InfluxDB version 1.0.

Create the database NOAA_water_database:

> CREATE DATABASE NOAA_water_database
>

Create the database NOAA_water_database with a new DEFAULT retention policy called liquid:

> CREATE DATABASE NOAA_water_database WITH DURATION 3d REPLICATION 3 SHARD DURATION 30m NAME liquid
>

When specifying a retention policy you can include one or more of the attributes DURATION, REPLICATION, SHARD DURATION, and NAME. For more on retention policies, see Retention Policy Management

A successful CREATE DATABASE query returns an empty result. If you attempt to create a database that already exists, InfluxDB does not return an error.

Delete a database with DROP DATABASE

The DROP DATABASE query deletes all of the data, measurements, series, continuous queries, and retention policies from the specified database. The query takes the following form:

DROP DATABASE [IF EXISTS] <database_name>

Note: The IF EXISTS clause does nothing, is deprecated, and will be removed in InfluxDB version 1.0.

Drop the database NOAA_water_database:

> DROP DATABASE NOAA_water_database
>

A successful DROP DATABASE query returns an empty result. If you attempt to drop a database that does not exist, InfluxDB does not return an error.

Drop series from the index with DROP SERIES

The DROP SERIES query deletes all points from a series in a database, and it drops the series from the index.

Note: DROP SERIES does not support time intervals in the WHERE clause. See DELETE for that functionality.

The query takes the following form, where you must specify either the FROM clause or the WHERE clause:

DROP SERIES FROM <measurement_name[,measurement_name]> WHERE <tag_key>='<tag_value>'

Drop all series from a single measurement:

> DROP SERIES FROM h2o_feet

Drop series with a specific tag pair from a single measurement:

> DROP SERIES FROM h2o_feet WHERE location = 'santa_monica'

Drop all points in the series that have a specific tag pair from all measurements in the database:

> DROP SERIES WHERE location = 'santa_monica'

A successful DROP SERIES query returns an empty result.

Delete series with DELETE

The DELETE query deletes all points from a series in a database. Unlike DROP SERIES, it does not drop the series from the index and it supports time intervals in the WHERE clause.

The query takes the following form where you must include either the FROM clause or the WHERE clause, or both:

DELETE FROM <measurement_name> WHERE [<tag_key>='<tag_value>'] | [<time interval>]

Delete all data associated with the measurement h2o_feet:

> DELETE FROM h2o_feet

Delete all data associated with the measurement h2o_quality and where the tag randtag equals 3:

> DELETE FROM h2o_quality WHERE randtag = '3'

Delete all data in the database that occur before January 01, 2016:

> DELETE WHERE time < '2016-01-01'

A successful DELETE query returns an empty result.

Things to note about DELETE:

• DELETE supports regular expressions in the FROM clause when specifying measurement names and in the WHERE clause when specifying tag values.
• DELETE does not support fields in the WHERE clause.

Delete measurements with DROP MEASUREMENT

The DROP MEASUREMENT query deletes all data and series from the specified measurement and deletes the measurement from the index.

The query takes the following form:

DROP MEASUREMENT <measurement_name>

Delete the measurement h2o_feet:

> DROP MEASUREMENT h2o_feet

Note: DROP MEASUREMENT drops all data and series in the measurement. It does not drop the associated continuous queries.

A successful DROP MEASUREMENT query returns an empty result.

Delete a shard with DROP SHARD

The DROP SHARD query deletes a shard. It also drops the shard from the metastore. The query takes the following form:

DROP SHARD <shard_id_number>

Delete the shard with the id 1:

> DROP SHARD 1
>

A successful DROP SHARD query returns an empty result. InfluxDB does not return an error if you attempt to drop a shard that does not exist.

Retention Policy Management

The following sections cover how to create, alter, and delete retention policies. Note that when you create a database, InfluxDB automatically creates a retention policy named default which has infinite retention. You may disable that auto-creation in the configuration file.

Create retention policies with CREATE RETENTION POLICY

The CREATE RETENTION POLICY query takes the following form:

CREATE RETENTION POLICY <retention_policy_name> ON <database_name> DURATION <duration> REPLICATION <n> [SHARD DURATION <duration>] [DEFAULT]

• DURATION determines how long InfluxDB keeps the data. The options for specifying the duration of the retention policy are listed below. Note that the minimum retention period is one hour.
  m minutes
  h hours
  d days
  w weeks
  INF infinite

  Currently, the DURATION attribute supports only single units. For example, you cannot express the duration 7230m as 120h 30m. See GitHub Issue #3634 for more information.

• REPLICATION determines how many independent copies of each point are stored in the cluster, where n is the number of data nodes.

• SHARD DURATION determines the time range covered by a shard group. The options for specifying the duration of the shard group are listed below. The default shard group duration depends on your retention policy’s DURATION.
  u microseconds
  ms milliseconds
  s seconds
  m minutes
  h hours
  d days
  w weeks

• DEFAULT sets the new retention policy as the default retention policy for the database.

Create a retention policy called one_day_only for the database NOAA_water_database with a one day duration and a replication factor of one:

> CREATE RETENTION POLICY one_day_only ON NOAA_water_database DURATION 1d REPLICATION 1
>

Create the same retention policy as the one in the example above, but set it as the default retention policy for the database.

> CREATE RETENTION POLICY one_day_only ON NOAA_water_database DURATION 1d REPLICATION 1 DEFAULT
>

A successful CREATE RETENTION POLICY query returns an empty response. If you attempt to create a retention policy that already exists, InfluxDB does not return an error.

Note: You can also specify a new retention policy in the CREATE DATABASE query. See Create a database with CREATE DATABASE.

Modify retention policies with ALTER RETENTION POLICY

The ALTER RETENTION POLICY query takes the following form, where you must declare at least one of the retention policy attributes DURATION, REPLICATION, SHARD DURATION, or DEFAULT:

ALTER RETENTION POLICY <retention_policy_name> ON <database_name> DURATION <duration> REPLICATION <n> SHARD DURATION <duration> DEFAULT

First, create the retention policy what_is_time with a DURATION of two days:

> CREATE RETENTION POLICY what_is_time ON NOAA_water_database DURATION 2d REPLICATION 1
>

Modify what_is_time to have a three week DURATION, a 30 minute shard group duration, and make it the DEFAULT retention policy for NOAA_water_database.

> ALTER RETENTION POLICY what_is_time ON NOAA_water_database DURATION 3w SHARD DURATION 30m DEFAULT
>

In the last example, what_is_time retains its original replication factor of 1.

A successful ALTER RETENTION POLICY query returns an empty result.

Delete retention policies with DROP RETENTION POLICY

Delete all measurements and data in a specific retention policy with:

DROP RETENTION POLICY <retention_policy_name> ON <database_name>

Delete the retention policy what_is_time in the NOAA_water_database database:

> DROP RETENTION POLICY what_is_time ON NOAA_water_database
>

A successful DROP RETENTION POLICY query returns an empty result. If you attempt to drop a retention policy that does not exist, InfluxDB does not return an error.