HTHou commented on a change in pull request #2469:
URL: https://github.com/apache/iotdb/pull/2469#discussion_r556993155
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File path: docs/UserGuide/Concept/SDT.md
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@@ -30,19 +30,21 @@ IoTDB allows you to specify the properties of SDT when
creating a time series, a
* CompDev (Compression Deviation)
-CompDev is the most important parameter in SDT that represents the maximum
difference between the current sample and the current linear trend.
+CompDev is the most important parameter in SDT that represents the maximum
difference between the
+current sample and the current linear trend. CompDev needs to be greater than
0 to perform compression.
-* CompMin (Compression Minimum)
+* CompMinTime (Compression Minimum Time Interval)
-CompMin is used for noisy reduction. CompMin measures the time distance
between two stored data points,
-if the current point's time to the last stored point's time distance is
smaller than or equal to compMin,
-current point will NOT be stored regardless of compression deviation.
+CompMinTime is used for noisy reduction. CompMinTime measures the time
distance between two stored data points,
+if the current point's time to the last stored point's time distance is
smaller than or equal to CompMinTime,
+current point will NOT be stored regardless of compression deviation. Default
value is -2147483647 and time unit is ms.
Review comment:
```suggestion
CompMinTime is a parameter measures the time distance between two stored
data points, which is used for noisy reduction.
If the time interval between the current point and the last stored point is
less than or equal to its value, current point will NOT be stored regardless of
compression deviation.
The Default value is -2147483647 with time unit ms.
```
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