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.
When working with TimescaleDB, you might encounter the error code TSDB-023 with the message: "Failed to drop hypertable." This error typically occurs when attempting to remove a hypertable from your database.
The primary symptom is the inability to drop a hypertable, which is often accompanied by an error message indicating active connections or dependencies.
The error code TSDB-023 signifies that the operation to drop a hypertable has failed. This usually happens because there are active connections to the hypertable or other database objects that depend on it, such as views or foreign keys.
Active connections to the hypertable prevent its removal, as do any existing dependencies. These dependencies could be in the form of views, indexes, or foreign key constraints that reference the hypertable.
To successfully drop a hypertable, you need to ensure that no active connections or dependencies exist. Follow these steps to resolve the issue:
Use the following query to identify active connections to the hypertable:
SELECT pid, usename, application_name, client_addr
FROM pg_stat_activity
WHERE datname = 'your_database_name' AND state = 'active';
Replace your_database_name with the name of your database. This query will list all active connections. Terminate these connections using:
SELECT pg_terminate_backend(pid)
FROM pg_stat_activity
WHERE datname = 'your_database_name' AND state = 'active';
Check for dependencies using:
SELECT *
FROM pg_depend
WHERE refobjid = 'your_hypertable_name'::regclass;
Replace your_hypertable_name with the name of your hypertable. Remove any dependencies such as views or foreign keys before proceeding.
Once all connections and dependencies are cleared, you can drop the hypertable using:
DROP TABLE your_hypertable_name;
Ensure that you replace your_hypertable_name with the actual name of your hypertable.
For more information on managing hypertables, visit the TimescaleDB Hypertables Documentation. If you encounter further issues, consider reaching out to the TimescaleDB Community for support.
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