Informational views overview

The full list of informational views available in TimescaleDB. Informational views provide detailed information about the state of your data, hypertables, chunks, and any jobs or policies you have in place

TimescaleDB makes complex database features like partitioning and data retention easy to use with our comprehensive APIs. TimescaleDB works hard to provide detailed information about the state of your data, hypertables, chunks, and any jobs or policies you have in place.

These informational views query TimescaleDB‘s internal catalog—system tables that store metadata about your database objects, configurations, and jobs. When you create a hypertable, add a retention policy, or schedule a job, TimescaleDB registers this information in its catalog. The views provide a convenient, user-friendly interface to access this metadata without directly querying internal tables.

Samples

Get all hypertables in your database

View all hypertables with their size and compression status:

SELECT hypertable_name,
       num_dimensions,
       num_chunks,
       compression_enabled
FROM timescaledb_information.hypertables;

Check chunk information for a hypertable

View all chunks for a specific hypertable:

SELECT chunk_name,
       range_start,
       range_end,
       is_compressed
FROM timescaledb_information.chunks
WHERE hypertable_name = 'conditions'
ORDER BY range_start DESC;

Monitor background jobs

View all scheduled jobs and their next execution time:

SELECT job_id,
       application_name,
       schedule_interval,
       next_start
FROM timescaledb_information.jobs
ORDER BY next_start;

Check job execution history

View recent job runs and their success/failure status:

SELECT job_id,
       last_run_started_at,
       last_successful_finish,
       last_run_status,
       total_runs,
       total_failures
FROM timescaledb_information.job_stats
ORDER BY last_run_started_at DESC
LIMIT 10;

View continuous aggregate details

Get information about all continuous aggregates:

SELECT view_name,
       view_definition,
       materialized_only,
       compression_enabled,
       finalized
FROM timescaledb_information.continuous_aggregates;

Check compression settings

View compression settings for all hypertables:

SELECT hypertable,
       segmentby,
       orderby,
       compress_interval_length
FROM timescaledb_information.hypertable_compression_settings
ORDER BY hypertable;

Available views

Hypertable and chunk information

• timescaledb_information.chunks: get metadata about hypertable chunks
• timescaledb_information.dimensions: get information on the dimensions of hypertables
• timescaledb_information.hypertables: get metadata about hypertables

Compression information

• timescaledb_information.chunk_compression_settings: get information about compression settings for all chunks
• timescaledb_information.compression_settings: get information about compression settings for hypertables (deprecated)
• timescaledb_information.hypertable_compression_settings: get information about compression settings for all hypertables

Continuous aggregates

• timescaledb_information.continuous_aggregates: get metadata and settings information for continuous aggregates

Jobs and policies

• timescaledb_information.job_errors: get information about background job errors
• timescaledb_information.job_history: get information about background job execution
• timescaledb_information.job_stats: get information and statistics about automatically run jobs
• timescaledb_information.jobs: get information about all jobs registered with the automatic scheduler
• timescaledb_experimental.policies: get information about all policies set on continuous aggregates