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| title: Server Configuration Parameter Reference |
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| This section describes all server configuration guc/parameters that are available in HAWQ. |
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| Configuration guc/parameters are located in `$GPHOME/etc/hawq-site.xml`. This configuration file resides on all HAWQ instances and can be modified by using the `hawq config` utility. You can use the same configuration file cluster-wide across both master and segments. |
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| **Note:** While `postgresql.conf` still exists in HAWQ, any parameters defined in `hawq-site.xml` will overwrite configurations in `postgresql.conf`. For this reason, we recommend that you only use `hawq-site.xml` to configure your HAWQ cluster. |
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| - **[About Server Configuration Parameters](../reference/guc/guc_config.html)** |
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| - **[Configuration Parameter Categories](../reference/guc/guc_category-list.html)** |
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| - **[Configuration Parameters](../reference/guc/parameter_definitions.html)** |
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| - **[Sample hawq-site.xml Configuration File](../reference/HAWQSampleSiteConfig.html)** |
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