# otp.Source.show_special_msgs

#### Source.show_special_msgs(inplace=False)

Shows ticks that represent internal events generated by OneTick analytics to facilitate graph processing.

Currently, only ticks that represent **PREPARE_FOR_RUNNING_QUERY** events are produced.

* **Parameters:**
  * **inplace** ([*bool*](https://docs.python.org/3/builtins/functions.html#bool)) -- The flag controls whether operation should be applied inplace or not.
    If `inplace=True`, then it returns nothing.
    Otherwise, method returns a new modified object.
  * **self** ([*Source*](https://docs.pip.distribution.sol.onetick.com/api/source/root.html.md#onetick.py.Source))
* **Return type:**
  [`Source`](https://docs.pip.distribution.sol.onetick.com/api/source/root.html.md#onetick.py.Source) or `None`

### Examples

**PREPARE_FOR_RUNNING_QUERY** event is generated in running queries:

```pycon
>>> data = otp.Tick(X=1, bucket_interval=1)
>>> data = data.show_special_msgs()
>>> otp.run(data, running=True, start=otp.now(), end=otp.now() + otp.Second(1))
  Time                  MSG_TYPE MSG_VAL
0  ... PREPARE_FOR_RUNNING_QUERY
```

#### SEE ALSO
**SHOW_SPECIAL_MSGS** OneTick event processor