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system-variable: add document for tx_isolation_one_shot #10566

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Oct 11, 2022
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system-variable: add document for tx_isolation_one_shot #10566

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system-variable: add document for tx_isolation_one_shot
tiancaiamao Sep 27, 2022
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Update system-variables.md
tiancaiamao Oct 9, 2022
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Update system-variables.md
tiancaiamao Oct 9, 2022
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remove a blank line
TomShawn Oct 9, 2022
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Expand Up @@ -2319,6 +2319,12 @@ Query OK, 0 rows affected, 1 warning (0.00 sec)

This variable is an alias for `transaction_isolation`.

### tx_isolation_one_shot

This variable is an internal system variable, not meant to be used directly.
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Could you provide the scope, the default value, or type, and the description?

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People should not use this variable directly, so why bother for more details?

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(For some historial reasons) It's a special one, not like the other variables...

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`SET TRANSACTION ISOLATION LEVEL [READ COMMITTED| REPEATABLE READ | ...]` is transformed to `SET @@SESSION.TX_ISOLATION_ONE_SHOT = [READ COMMITTED| REPEATABLE READ | ...]` by the TiDB parser internally.
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### version

- Scope: NONE
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