How to resolve the issue of forced Oracle index not wor…

1 year ago
Liam
2 minutes

If the Oracle enforced index is not working, you can try the following solutions:

  1. Check if there are any issues with the index: You can use the SELECT * FROM USER_INDEXES statement to view the status and properties of the index, to confirm if it exists and if it is usable.
  2. Rebuild index: Use the ALTER INDEX index_name REBUILD statement to rebuild the index, ensuring its accuracy and effectiveness.
  3. Force the use of an index: Use the /*+ INDEX(table_name index_name) */ hint in an SQL statement to specify the index to be used, for example SELECT /*+ INDEX(emp emp_idx) */ * FROM employees.
  4. Ensure that statistics are up-to-date: Use the DBMS_STATS.GATHER_SCHEMA_STATS procedure to update the statistics of relevant tables and indexes, ensuring that the optimizer can correctly select indexes.
  5. Adjust the query statement: Rewrite the query statement using different conditions or joining methods to utilize the index.
  6. Check index availability: ensure that the tablespace where the index is located has enough space and that the index is in a usable state.
  7. Adjust database parameters: Optimize Oracle database by adjusting relevant parameters such as optimizer_index_caching and optimizer_index_cost_adj based on specific circumstances to enhance query plan selection.
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