Originally posted by helpme
so it means in such a scenario ,row chaning would never take place...unless the inserted record length is greater than 60% of the block size?
No, it means that row chaining in such a scenario would never take place unless inserted record length is greater than whole database block, that is 100% of block size (if we neglect some overhead for block header)!

You could later expirience another kind of row chaining, called row migration. But this can happen only when updating existing records, not while inserting.