Microsoft SQL Server Express considerations
You can use Microsoft SQL Server Express as your Deep Security database in certain scenarios, but there are important limitations due to the 10 GB size limit for Microsoft SQL Server Express databases. If you think your deployment may exceed these limitations, use Microsoft SQL Server, Oracle database, or PostgreSQL instead.
Limited number of protected computers
Do not use Microsoft SQL Server Express if your deployment has more than 50 protected computers. More computers' events will cause a larger database which Microsoft SQL Server Express cannot handle.
Security module limitations
Only the anti-malware and intrusion prevention modules are supported for use with Microsoft SQL Server Express, due to its database size limitation. If you require any other protection modules, use Microsoft SQL Server, Oracle, or PostgreSQL instead.
Minimize the agent size
Remove any unneeded agent software packages from the Deep Security Manager to save disk space.
Security updates and events require additional space in the database. Monitor your deployment on an ongoing basis to ensure that you stay below to 10 GB limit.