There is no limitation on the number of Instances monitored by PASS repository database. This is based on the limitation of the third party software. For example, when using SQL Server Express 2008 as a repository database, this version has the following limitations:
- Number of CPUs: 1
- Maximum memory utilized: 1 GB
- Maximum database size: 10 GB
Based on the above limitations, PASS can have one or multiple monitored instances as long as the repository DB is less than 10GB. Once the limitation has been reached with the third party software, no new data can be stored in the repository database.
Exceeding the recommended number of monitored instances in a PASS repository database could cause it to get to the point where the repository cannot keep up with the data being sent to it. Plus a big increase in the chances of locking and blocking making the repository fall behind, etc.
The number 50 is a recommendation however, and not a hard limit based on our experience supporting the product. If you run into issues and have more than 50, reducing the number of instances would be our first step in troubleshooting to get you below the limit.