In addition to questions asked by Visvanath ...
In Performance Metrics
What does it show for:
Max MySQL memory
Other process memory
Maximum reached memory usage: 2.0G (26.83% of installed RAM)
Maximum possible memory usage: 2.2G (28.90% of installed RAM)
Overall possible memory usage with other process is compatible with memory available
InnoDB buffer pool / data size:
Is server an all in one box? code/db/moodledata on same server?
Since you will be culling courses, good idea, me thinks, maybe for records retention, to archive courses you will be deleting
to a storage device.
Would also recommend auto backups be stored outside of moodledata/filedir/
Designated directory option in set up of auto backups.
Among reasons ... designated directory will store backups by humanly recognizable names and true admin of sever can find them without DB queries and the need of meta data in DB.