TimescaleDB is an open-source time-series database optimized for fast ingest and complex queries. It is built on top of PostgreSQL, providing the reliability and robustness of a traditional relational database while offering the scalability and performance needed for time-series data.
One common issue users may encounter when using TimescaleDB is disk space exhaustion. This occurs when the database consumes all available disk space, leading to potential downtime and data loss. Users might notice slow performance, failed writes, or error messages indicating insufficient disk space.
The error code TSDB-020 signifies a disk space exhaustion issue in TimescaleDB. This typically arises when there is a large volume of data being stored without appropriate data retention policies in place. Over time, this can lead to the database consuming all available disk space.
The primary cause of this issue is the accumulation of time-series data without implementing strategies to manage data growth. Without retention policies, old data remains in the database indefinitely, consuming valuable storage resources.
To prevent disk space exhaustion, it is crucial to implement data retention policies. These policies automatically remove old data, freeing up disk space. You can use the following SQL command to create a retention policy:
SELECT add_retention_policy('your_hypertable', INTERVAL '30 days');
This command will ensure that data older than 30 days is automatically removed from the specified hypertable.
In addition to retention policies, manually cleaning up unnecessary data can help reclaim disk space. Use the following query to delete data older than a specific date:
DELETE FROM your_hypertable WHERE time < NOW() - INTERVAL '30 days';
Ensure that you replace your_hypertable with the actual name of your hypertable.
Regularly monitoring disk usage can help you identify potential issues before they become critical. Use the following query to check the size of your hypertables:
SELECT hypertable_name, total_bytes FROM hypertable_detailed_size('your_hypertable');
Replace your_hypertable with the name of your hypertable to get detailed size information.
For more information on managing disk space in TimescaleDB, refer to the official TimescaleDB Data Retention Guide. Additionally, consider exploring the Hypertables Documentation for more insights on managing your data efficiently.
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