This indicates that rows are spanning across multiple blocks. While this may simply be indicative of long rows, it can also be indicative of data fragmentation.
Recommendation:
Consider reorganizing data via export/import to pack rows more tightly and alleviate chained row issues. Another option is using larger block sizes on tables with long rows.
Use Xattr CloudFiler™ to dedup, encrypt and move your RMAN backups to the cloud.
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