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table and index fragmantation

in Database Backup and Recovery (MOSC) 10 commentsAnswered ✓

Dears I have Oracle Database 19c RAC on Linux, I have a table that has a lot of deletes and updates causing this table and its indexes to be fragmented (i guess)

we noticed a poor performance and HIGH I/O on this table

running segment advisor report mentioned that :

enable row movement on table RECONDATA and perform shirnk estimated savings is 22GB,


the same was provided for the index

  • does this means that i should do what is requested to enhance the performance of the table
  • does shrinking the table enhance performance
  • i know to defragmat the index we should rebuild the index , when this should be applied i.e when to know if i should rebuild the index what is the indication on fragmantation factor

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