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Query regarding index rebuilding

Oracle database version 12.1.0.2

1.On one of our production database we are facing database slowness issue.(there is excessive inserts, updates and deletes on a schema)

I am planning to rebuild a indexes for the schema on which excessive DML operations are performed.

I want to know if there are any risks with rebuilding indexes.


2.Also I have question regarding rebuilding partitioned and subpartitioned indexes.

-Do I need to rebuild partitioned indexes and subpartitioned indexes or simply rebuild indexes?


Any suggestions would be appreciated.


Thank you!

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