Documentation

Information schema

Limited availability

InfluxDB Clustered is currently only available to a limited group of InfluxData customers. If interested in being part of the limited access group, please contact the InfluxData Sales team.

The underlying query engine for the InfluxDB SQL implementation, DataFusion, provides commands that return metadata related to your data schema. To access this information, use the SHOW TABLES, SHOW COLUMNS, and SHOW ALL commands or query views in the ISO SQL information_schema schema.

In the context of InfluxDB, a measurement is represented as a table. Time, tags, and fields are each represented by columns in a table.

SHOW TABLES

Returns information about tables (measurements) in an InfluxDB database.

SHOW TABLES

You can also query the information_schema.tables view:

SELECT * FROM information_schema.tables

Example SHOW TABLES output

Measurements are those that use the iox table schema.

table_catalogtable_schematable_nametable_type
publicioxhomeBASE TABLE
publicsystemqueriesBASE TABLE
publicinformation_schematablesVIEW
publicinformation_schemaviewsVIEW
publicinformation_schemacolumnsVIEW
publicinformation_schemadf_settingsVIEW

SHOW COLUMNS

Returns information about the schema of a table (measurement) in an InfluxDB database.

SHOW COLUMNS FROM example_table

You can also query the information_schema.columns view:

SELECT
  table_catalog,
  table_schema,
  table_name,
  column_name,
  data_type,
  is_nullable
FROM information_schema.columns
WHERE table_name = 'example_table'

Example SHOW COLUMNS output

table_catalogtable_schematable_namecolumn_namedata_typeis_nullable
publicioxhomecoInt64YES
publicioxhomehumFloat64YES
publicioxhomeroomDictionary(Int32, Utf8)YES
publicioxhometempFloat64YES
publicioxhometimeTimestamp(Nanosecond, None)NO

SHOW ALL

Returns the configuration options of the current session.

SHOW ALL

You can also query the information_schema.df_settings view:

SELECT * FROM information_schema.df_settings

View SHOW ALL example output


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