[GitHub] [iotdb] HTHou commented on a change in pull request #2469: clarify sdt doc

[GitBox <gi...@apache.org>]

HTHou commented on a change in pull request #2469:
URL: https://github.com/apache/iotdb/pull/2469#discussion_r556992285



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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
   if the time interval between the current point and the last stored point is less than or equal to this value, current point will NOT be stored regardless of compression deviation. 
   The Default value is -2147483647 with time unit ms.
   ```




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