Hi,

You have 14 groups of 50MB each and you say that during high activity you still get checkpoint not complete messages. This implies that the archiver is not writing the data fast enough to disk to free up the space in online redo logs. Check you IO response times for the disk holding the archive directory. If you find contentions on this disk move the archive directory to a faster disk. Another way is to change your redo file size to 100MB to make more room in online redo logs.

Baliga