How do I fix unusable index in Oracle?

How do I fix unusable index in Oracle?

To repair the index, it must be re-created with the ALTER INDEX… REBUILD command. for each index key. When the new index is completed, the original unusable index is dropped.

How do you make an unusable index usable?

To make an index unusable:

1. Query the data dictionary to determine whether an existing index or index partition is usable or unusable.
2. Make an index or index partition unusable by specifying the UNUSABLE keyword.
3. Optionally, query the data dictionary to verify the status change.

How do I change an existing index in Oracle?

Use the ALTER INDEX statement to change or rebuild an existing index. The index must be in your own schema or you must have ALTER ANY INDEX system privilege. To execute the MONITORING USAGE clause, the index must be in your own schema.

Why do indexes become unusable in Oracle?

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.

How do you find unusable indexes?

Check unusable and not valid Index in Oracle Query will cover the complete index with partition index and sub partition index. Result will give you the rebuild command of invalid or unusable index. You can directly run that and on sqlplus and make them valid or usable state. WHERE STATUS=’UNUSABLE’;

How do you find the index of the unusable state?

How do I edit an existing index?

To modify an index Expand the table in which the index belongs and then expand Indexes. Right-click the index that you want to modify and then click Properties. In the Index Properties dialog box, make the desired changes.

Can we ALTER INDEX?

Alter Index in Oracle 11g The index must be in your own schema or you must have to ALTER ANY INDEX system privilege. To execute the MONITORING USAGE clause, the index must be in your own schema.

How do you know if an index is unusable?

What is unusable index?

Oracle indexes can go into a UNUSABLE state after maintenance operation on the table or if the index is marked as ‘unusable’ with an ALTER INDEX command. A direct path load against a table or partition will also leave its indexes unusable.

Why are my Oracle indexes going into an unusable state?

Unusable indexes. Oracle indexes can go into a UNUSABLE state after maintenance operation on the table or if the index is marked as ‘unusable’ with an ALTER INDEX command. A direct path load against a table or partition will also leave its indexes unusable. Queries and other operations against a table with unusable indexes will generate errors:

How do I alter an index in Oracle?

Use the ALTER INDEX statement to change or rebuild an existing index. The index must be in your own schema or you must have the ALTER ANY INDEX system privilege. To rebuild an online index in another user’s schema, you must have the CREATE ANY INDEX and CREATE ANY TABLE system privileges.

When did Oracle Database 11gR2 lifetime support change?

Oracle Database 11gR2 (11.2) Lifetime Support Changes (Doc ID 2068368.1) Last updated on APRIL 20, 2020 Applies to: Oracle Database Cloud Schema Service – Version N/A and later Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) – Version N/A and later

How are indexes used in the Oracle Database?

Oracle Database provides a means of monitoring indexes to determine whether they are being used. If an index is not being used, then it can be dropped, eliminating unnecessary statement overhead.