#### 5.6.4.1 Installing or Uninstalling the Rewriter Query Rewrite Plugin

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Note

 If installed, the `Rewriter` plugin involves some overhead even when disabled. To avoid this overhead, do not install the plugin unless you plan to use it.

 To install or uninstall the `Rewriter` query rewrite plugin, choose the appropriate script located in the `share` directory of your MySQL installation:

* `install_rewriter.sql`: Choose this script to install the `Rewriter` plugin and its associated elements.

* `uninstall_rewriter.sql`: Choose this script to uninstall the `Rewriter` plugin and its associated elements.

 Run the chosen script as follows:

```
$> mysql -u root -p < install_rewriter.sql
Enter password: (enter root password here)
```

 The example here uses the `install_rewriter.sql` installation script. Substitute `uninstall_rewriter.sql` if you are uninstalling the plugin.

 Running an installation script should install and enable the plugin. To verify that, connect to the server and execute this statement:

```
mysql> SHOW GLOBAL VARIABLES LIKE 'rewriter_enabled';
+------------------+-------+
| Variable_name    | Value |
+------------------+-------+
| rewriter_enabled | ON    |
+------------------+-------+
```

 For usage instructions, see [Section 5.6.4.2, “Using the Rewriter Query Rewrite Plugin”](rewriter-query-rewrite-plugin-usage.html). For reference information, see [Section 5.6.4.3, “Rewriter Query Rewrite Plugin Reference”](rewriter-query-rewrite-plugin-reference.html).

