Sometimes people complain that they have seen background DB queries executed by some WSO2 products(EX: WSO2 API Manager Gateway profile). These query executions are not harmful, and those correspond to registry indexing task that runs in the background.
It is not required to enable indexing task for APIM 1.10.0 based Gateway or Key Manager nodes. So you can disable the indexing task by setting "startIndexing" parameter as false. This "startIndexing" parameter should be configured in the registry.xml file under "indexingConfiguration" section.
<indexingConfiguration> <startIndexing>false</startIndexing> ...... </indexingConfiguration>