> For the complete documentation index, see [llms.txt](https://docs.pentaho.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.pentaho.com/pdia-data-integration/10.2-data-integration/pdi-transformation-steps-reference-overview/mongodb-execute/commands-execute-step/database-commands.md).

# Database commands

| Command                                          | Description                                                                                                                                                                                                                                                             | Output                                                                                                                      |
| ------------------------------------------------ | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | --------------------------------------------------------------------------------------------------------------------------- |
| `db.createCollection( STRING *collectionName*` ) | Creates a collection with the specified name. Strings are surrounded by double qoutes. For example:`db.createCollection("identities");`                                                                                                                                 | The String = "true" when the database is created. If the command fails, an error is raised.                                 |
| `db.listCollectionNames( )`                      | Lists the names of the collections in the selected database.                                                                                                                                                                                                            | An output row for each collection in the database with the result field containing the String name of the collection.       |
| `db.listCollections( )`                          | Lists collection details of all collections in the selected database.                                                                                                                                                                                                   | An output row for each collection in the database with the result field containing a BSON document with collection details. |
| `db.runCommand( BSON *command*` )                | Runs a command on the selected database. See [db.runCommand](https://docs.mongodb.com/manual/reference/method/db.runCommand/) for details on a similar shell command. For example: `db.runCommand( { find : "identities", projection : { superhero : 1, _id : 0 } } );` | An output row containing with the result field containing a BSON document of command results.                               |


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