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decompress_chunk() CommunityCommunity functions are available under Timescale Community Edition. Click to learn more.
Community
Community functions are available under Timescale Community Edition. Click to learn more.
If you need to modify or add data to a chunk that has already been compressed, you need to decompress the chunk first. This is especially useful for backfilling old data.
note
Before decompressing chunks, stop any compression policy on the hypertable you are decompressing. When you finish backfilling or updating data, turn the policy back on. The database automatically recompresses your chunks in the next scheduled job.
Required arguments
| Name | Type | Description |
|---|---|---|
chunk_name | REGCLASS | Name of the chunk to be decompressed. |
Optional arguments
| Name | Type | Description |
|---|---|---|
if_compressed | BOOLEAN | Setting to true skips chunks that are not compressed. Defaults to false. |
Sample usage
Decompress a single chunk:
SELECT decompress_chunk('_timescaledb_internal._hyper_2_2_chunk');Decompress all compressed chunks in a hypertable named metrics:
SELECT decompress_chunk(c, true) FROM show_chunks('metrics') c;Found an issue on this page?
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