invalidation engine clarification for CAGGs#4557
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Allow 10 minutes from last push for the staging site to build. If the link doesn't work, try using incognito mode instead. For internal reviewers, check web-documentation repo actions for staging build status. Link to build for this PR: http://docs-dev.timescale.com/docs-4552-feedback |
billy-the-fish
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Nov 7, 2025
svenklemm
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Nov 10, 2025
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| When data older than the invalidation threshold is changed, each mutation | ||
| operation logs the minimum and maximum timestamps of the rows it modified. | ||
| The continuous aggregate then identifies which complete time buckets contain | ||
| these modified rows. Only those specific buckets are recalculated during refresh. | ||
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| For example, if one operation modifies rows in the 10:00 bucket and another | ||
| modifies rows in the 15:00 bucket, only those two buckets are recalculated. The | ||
| buckets in between (11:00, 12:00, 13:00, 14:00) are not affected. | ||
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| This logging does cause some write load. However, the threshold lags behind the | ||
| area of data that is currently changing, so the writes are small and rare. |
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Hmm its more complicated than that, it depends how you define operation, the min/max tracking is per transaction so if you modify 10:00 and 15:00 in 1 transaction then all buckets in between would also be recalculated. If you modify 10:00 in a transaction and 15:00 in a separate transaction then intermediate values would not be recalculated
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Updated, thank you.
svenklemm
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Nov 13, 2025
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