How to check if an index is invalid in Oracle?

2 years ago
Sophia Anderson
2 minutes

You can use the following methods to check for invalid indexes in an Oracle database:

  1. Check if the index is invalid by using SQL queries.
  2. Get the index name and status from all the indexes where the table name matches ‘your_table_name’.
  3. This query will return all indexes of the specified table along with their statuses. If an index’s status is marked as UNUSABLE, it means that the index is invalid.
  4. Get the statistics of a table by using SQL queries.
  5. Show the table_name, index_name, status, and number of rows from the all_indexes table where the table_name is ‘your_table_name’.
  6. This query will return all indexes of a specified table, along with their statuses and row numbers. If the status of an index is UNUSABLE, it means that the index is invalid.
  7. Check if an index is invalid using the relevant procedures in the DBMS_STATS package.
  8. Update statistics for the specified table in your schema using DBMS_STATS.
  9. By running the above command, Oracle will recalculate the statistics for the specified table. Recalculating the statistics may potentially fix any ineffective indexes.

Please be aware that index invalidation may be caused by changes in the table’s data or other factors. If you confirm that an index is invalid and cannot be automatically repaired, you may need to manually rebuild the index to restore its effectiveness.

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