---
title: "Command Line options"
slug: "command-line-options"
updated: 2026-06-19T15:57:56Z
published: 2026-06-19T15:57:56Z
canonical: "docs.datajet.app/command-line-options"
stale: true
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.datajet.app/llms.txt
> Use this file to discover all available pages before exploring further.

# Command Line options

Command-line options are `key=value` parameters passed to the DataJet Server when the server starts. They are normally set in the start-up script (see [Starting the DataJet Server](/v1/docs/starting-datajet-server)) and control; file locations, network ports, the database connection, and engine tuning.

These start-up parameters are distinct from the runtime [Command Line](/v1/docs/command-line) console, which adjusts a running server interactively.

Parameters take the form `key=value`, separated by spaces.

## Example start-up file

A typical start-up batch file changes into the binaries folder, launches the server with the required parameters, and pauses so the console stays open:

```bat
cd bin
DatajetServer.exe path=f:\datajet\ bin=f:\datajet\bin\ porta=5555 portb=5556 shareddatapath=\\fileserver\DJSharedData\sources datapath=f:\datajet\datasources\ mongoURL=127.0.0.1 mongoPort=27017 rms=48
pause
```

`cd bin` and `pause` are part of the batch script, not server parameters — `pause` simply holds the window open after the server stops.

Where a parameter also exists as a [Server Configuration File](/v1/docs/server-configuration-file) key, the value in `djserver.cnfg` takes precedence.

## File and data locations

| Parameter | Description |
| --- | --- |
| path | Root DataJet installation folder. |
| bin | Folder containing the server binaries. |
| datapath | Local data source location. |
| shareddatapath | Shared project data location. |
| systemoutput | Team output location — output files such as data exports, accessible to all users. Defaults to a sub-folder of the realm repository. |
| useroutput | User output location — per-user generated output such as data exports; each user sees only their own folder. Defaults to a sub-folder of the team output folder. |
| templatepath | Shared template location. Created automatically if it does not exist. |
| inipath | Folder containing `djserver.cnfg` and `djclient.cnfg` (see [Server Configuration File](/v1/docs/server-configuration-file)). |

## Network and database

| Parameter | Config-file key | Default | Description |
| --- | --- | --- | --- |
| porta | localPort | 5555 | Port for client/desktop connections. |
| portb | corePort | 5556 | Port for the core processor. |
| mongourl | mongoURL | 127.0.0.1 | MongoDB host. |
| mongoport | mongoPort | 27017 | MongoDB port. |
| IP | IP | 0.0.0.0 | Address the server binds to. |

## Engine tuning

| Parameter | Config-file key | Default | Description |
| --- | --- | --- | --- |
| rms | rms | 32 | Requestable Memory Size in GB; freely settable (the example uses 48). See [Command Line → rms](/v1/docs/command-line#rms). |
| pool | processPoolSize | 8 | Worker processes in the processing pool. Clamped to 4–32. |
| cache | coreCache | 256 | Core cache size. |
| ilgb | coreLGb | 32 | Core memory budget in GB. Clamped to 8–128. |
| fragments | fragments | 4000 | Clamped to 500–8000. |
| psize | — | — |  |

## Logging and advanced

| Parameter | Description |
| --- | --- |
| log | `log=verbose` enables verbose start-up logging. |
| oldformats | - |