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op-guide: Improved consistency of variable descriptions #612

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Sep 17, 2018
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op-guide: Improved consistency of variable descriptions #612

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4 changes: 2 additions & 2 deletions op-guide/history-read.md
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Expand Up @@ -107,7 +107,7 @@ Pay special attention to the following two variables:
Query OK, 0 rows affected (0.00 sec)
```

> **Note:** You should use `@@` instead of `@` before `tidb_snapshot` because `@@` is used to denote the system variable while `@` is used to denote the user variable.
> **Note:** You should use `@@` instead of `@` before `tidb_snapshot` because `@@` is used to denote the global variable while `@` is used to denote the session variable.

**Result:** The read from the following statement is the data before the update operation, which is the history data.

Expand Down Expand Up @@ -142,4 +142,4 @@ Pay special attention to the following two variables:
3 rows in set (0.00 sec)
```

> **Note:** You should use `@@` instead of `@` before `tidb_snapshot` because `@@` is used to denote the system variable while `@` is used to denote the user variable.
> **Note:** You should use `@@` instead of `@` before `tidb_snapshot` because `@@` is used to denote the global variable while `@` is used to denote the session variable.