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Oracle invalid or unusable indexes

Oracle Database Tips by Donald Burleson


Indexes can become invalid or unusable whenever a DBA tasks shifts the ROWID values, thereby requiring an index rebuild. These DBA tasks that shift table ROWID's include:

  • Table partition maintenance - Alter commands (move, split or truncate partition) will shift ROWID's, making the index invalid and unusable.
  • CTAS maintenance - Table reorganization with "alter table move" or an online table reorganization (using the dbms_redefinition package) will shift ROWIDs, creating unusable indexes.
  • Oracle imports - An Oracle import (imp utility) with the skip_unusable_indexes=y parameter
  • SQL*Loader (sqlldr utility) - Using direct path loads (e.g. skip_index_maintenance) will cause invalid and unusable indexes.




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