I have an SQL Server 2008 and for maintenance solutions I use Ola Hallengren scripts. Recently, out of 15 databases I have on this server, I made two changes in three of them (not system databases, but user databases). I removed mirroring and changed recovery model from full to simple. This done running sql commands on SQL Server Management Studio. 

From the day I made these changes, I noticed strange behavior on Ola Hallengren's sql job for integrity check and full backup on system databases. To understand, while 2 minutes were enough to run and finish the job, now it needs approximately 10 minutes for the same job. As a result, at this time I/O increases on SQL server and it gives timeouts.

I don't know and I didn't find anywhere if running the following commands could possible influence system databases.

```
ALTER DATABASE <database_name> SET PARTNER OFF
and
USE master ;
ALTER DATABASE <database_name> SET RECOVERY SIMPLE ;

```

where database\_name is the users database I made the change, not the systems.

Is it possible made those changes affect anything on system databases?