Frequently asked questions
Common questions
And if something isn't here, write to info@rarexa.com — we reply fast.
Installation & deployment
Do I need to install agents on each database?
No. The dashboard connects over the network (SQL*Net) with a read-only user. It installs nothing inside Oracle or on the database servers.
Which operating systems does it run on?
Windows (portable executable, setup.exe installer, or MSI package for GPO) and Linux (Docker image or systemd service). It runs as a service/daemon and starts with the system.
How long does setup take?
Minutes. Download and run — on Windows you double-click the .exe, no Python, no installs. The server starts on localhost; you register the first connection and you're live.
What does Windows require?
Visual C++ Redistributable and .NET Framework (for the service). The installer detects them automatically and warns you if one is missing, to avoid failures on fresh machines.
Security & data
Does the dashboard modify anything in my database?
No. It runs read-only SELECT queries against dictionary views only. It creates no objects, modifies no data and requires no write privileges. Your database is completely untouched.
What user permissions are required in Oracle?
A read-only monitoring user with SELECT on V$SESSION, V$SQL, V$SYSSTAT, V$SYSTEM_EVENT, V$SGASTAT, V$PGASTAT, V$DATABASE, V$INSTANCE, V$RMAN_BACKUP_JOB_DETAILS, DBA_DATA_FILES, DBA_FREE_SPACE, DBA_TEMP_FILES and V$TEMP_SPACE_HEADER. The user manual includes the exact GRANT statements.
Does my data leave my network?
Never. OHD is on-premise: it runs on your server and queries your databases directly. There is no intermediary cloud and no external telemetry. Connection credentials and alert secrets are stored encrypted at rest.
Compatibility
Does it work with Oracle XE (Express Edition)?
Yes. The dashboard works with Oracle XE, SE and EE across versions 12c through 23ai (certified on 18c, 19c, 21c, 23ai). It only requires network access and a user with SELECT privileges on V$ and DBA_ views.
Does it work with Oracle on cloud? (OCI, AWS RDS, Azure)
Yes. As long as you have network connectivity to port 1521 (or your configured port), the dashboard works with any accessible Oracle instance — on-premises or cloud-hosted.
Can I monitor multiple databases at once?
Yes — the fleet view monitors your whole Oracle estate simultaneously in real time. The number of databases depends on your edition: Desktop covers up to 3, Server up to 25, and Enterprise is unlimited.
Licensing & support
Is there a free trial?
Yes. The dashboard includes a 15-day trial mode that starts automatically on first run — no license key needed. After 15 days you'll need to activate with a purchased key.
How does licensing work?
It's an annual subscription, activated offline. On first run the dashboard generates a unique Machine ID; send it by email and you'll receive a license key — typically within 24 hours. Enter the key once to activate for 12 months. Renewing simply means pasting a new key.
What happens when my subscription expires?
You get a renewal reminder starting 30 days before expiry. After the expiry date there is a 14-day grace period during which the dashboard keeps working with a renewal banner. After the grace period, monitoring pauses until you enter a renewed key — your saved configuration and history are never deleted.
Do you offer support?
Yes. All editions include email support; Enterprise adds priority support with an SLA. Write to support@rarexa.com.
Didn't find your answer?
Write to us and we'll help you evaluate whether OHD fits your environment.