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docs/op-guide: create GC document #433

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docs/op-guide: create GC document
CaitinChen Apr 20, 2018
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CaitinChen Apr 23, 2018
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CaitinChen Apr 23, 2018
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CaitinChen Apr 24, 2018
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CaitinChen authored Apr 24, 2018
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Expand Up @@ -81,4 +81,4 @@ The TiDB transaction model is inspired by Google's Percolator. It's mainly a two
### 3. Do GC

Clear the data before the safe point of each key and the write record.
> **Note**: If the last record in all the write records of `Put` and `Delete` types before the safe point is `Put`, this record and its data cannot be deleted directly. Otherwise, you cannot successfully perform the read operation whose timestamp is after the safe point and before the next key version.
> **Note**: If the last record in all the write records of `Put` and `Delete` types before the safe point is `Put`, this record and its data cannot be deleted directly. Otherwise, you cannot successfully perform the read operation whose timestamp is after the safe point and before the next version of the key.