oracle database vr 18.104.22.168
getting local write wait (class i/o) in top five wait events
performing frequent truncates.
couldn't find a solution
You're definitely in the wrong forum. This one might be better suited General Database Discussions
Yes, you'll have "local write" waits when doing a TRUNCATE. You could reduce the DB_CACHE_SIZE to reduce the number of blocks that Oracle needs to write.
Hemant K Chitale