# Apply a query pushdown optimization

Use the Query Pushdown optimization technique to translate the `WHERE` clause in a SQL query run against a data service to a corresponding `WHERE` clause in the Table Input or MongoDB Input steps. Queries in these input steps are then filtered down and more efficiently handled at the data source.


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.pentaho.com/pdia-data-integration/9.3-data-integration/advanced-topics-pentaho-data-integration-overview/pentaho-data-services/optimize-a-pentaho-data-service/apply-a-query-pushdown-optimization.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.