system-variable: add document for tx_isolation_one_shot (#10566) (#10726

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pingcap · Oct 12, 2022 · 68e6fbb · 68e6fbb
1 parent 63ead7a
commit 68e6fbb
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diff --git a/system-variables.md b/system-variables.md
@@ -3218,6 +3218,14 @@ For details, see [Identify Slow Queries](/identify-slow-queries.md).
 
 This variable is an alias for `transaction_isolation`.
 
+### tx_isolation_one_shot
+
+> **Note:**
+>
+> This variable is internally used in TiDB. You are not expected to use it.
+
+Internally, the TiDB parser transforms the `SET TRANSACTION ISOLATION LEVEL [READ COMMITTED| REPEATABLE READ | ...]` statements to `SET @@SESSION.TX_ISOLATION_ONE_SHOT = [READ COMMITTED| REPEATABLE READ | ...]`.
+
 ### version
 
 - Scope: NONE