In a scenario where multiple DBs are simultaneously imported with high concurrency, a significant number of transactions will be generated. Without a summary field, we cannot clearly see how many transactions there are in the current cluster. Therefore, I have enhanced this point.
```
mysql> show proc "/transactions";
+-------+-----------------------------------+-----------------------+
| DbId | DbName | RunningTransactionNum |
+-------+-----------------------------------+-----------------------+
| 10002 | default_cluster:xxxx | 0 |
| 14005 | default_cluster:__internal_schema | 0 |
| Total | 2 | 0 |
+-------+-----------------------------------+-----------------------+
3 rows in set (0.02 sec)
```
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