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Add description for isolationLevel (#3310)
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* Add description for isolationLevel

* Update tispark-overview.md

Co-authored-by: Ran <huangran@pingcap.com>

Co-authored-by: Ran <huangran@pingcap.com>
Co-authored-by: ti-srebot <66930949+ti-srebot@users.noreply.github.com>
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@TomShawn @ran-huang @ti-srebot
3 people authored Jul 21, 2020
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Expand Up @@ -230,6 +230,10 @@ df.write
It is recommended to set `isolationLevel` to `NONE` to avoid large single transactions which might potentially lead to TiDB OOM.
> **Note:**
>
> When you use JDBC, the default value of `isolationLevel` is `READ_UNCOMMITTED`, which causes the error of unsupported isolation level transactions. It is recommended to set the value of `isolationLevel` to `NONE`.
## Statistics information
TiSpark uses TiDB statistic information for the following items:
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