#### 28.4.4.10 The ps\_setup\_enable\_instrument() Procedure

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 Enables Performance Schema instruments with names that contain the argument. Produces a result set indicating how many instruments were enabled. Already enabled instruments do not count.

##### Parameters

* `in_pattern VARCHAR(128)`: The value used to match instrument names, which are identified by using `%in_pattern%` as an operand for a [`LIKE`](string-comparison-functions.html#operator_like) pattern match.

   A value of `''` matches all instruments.

##### Example

 Enable a specific instrument:

```
mysql> CALL sys.ps_setup_enable_instrument('wait/lock/metadata/sql/mdl');
+----------------------+
| summary              |
+----------------------+
| Enabled 1 instrument |
+----------------------+
```

 Enable all mutex instruments:

```
mysql> CALL sys.ps_setup_enable_instrument('mutex');
+-------------------------+
| summary                 |
+-------------------------+
| Enabled 177 instruments |
+-------------------------+
```

