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system-variables: add variable description (#3672) #3676

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1 change: 1 addition & 0 deletions system-variables.md
Original file line number Diff line number Diff line change
Expand Up @@ -115,6 +115,7 @@ The following MySQL system variables are fully supported in TiDB and have the sa
| tx_isolation | GLOBAL \| SESSION | the isolation level of a transaction |
| max\_execution\_time | GLOBAL \| SESSION | the execution timeout for a statement, in milliseconds |
| innodb\_lock\_wait\_timeout | GLOBAL \| SESSION | the lock wait time for pessimistic transactions, in seconds |
| interactive\_timeout | SESSION \| GLOBAL | the idle timeout of the interactive user session, in seconds |

> **Note:**
>
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