Oracle Database Interview Question:

How To Rebuild an Index in Oracle?

Submitted by: Administrator

If you want to rebuild an index, you can use the "ALTER INDEX ... REBUILD statement as shown in the following SQL script:

SELECT index_name, table_name, uniqueness
FROM USER_INDEXES WHERE table_name = 'EMPLOYEES';
<pre>INDEX_NAME TABLE_NAME UNIQUENES
----------------------- --------------------- ---------
EMP_EMAIL_UK EMPLOYEES UNIQUE
EMP_EMP_ID_PK EMPLOYEES UNIQUE
EMP_DEPARTMENT_IX EMPLOYEES NONUNIQUE
EMP_JOB_IX EMPLOYEES NONUNIQUE
EMP_MANAGER_IX EMPLOYEES NONUNIQUE
EMP_NAME_IX EMPLOYEES NONUNIQUE</pre>
ALTER INDEX EMP_NAME_IX REBUILD;
Statement processed.
Submitted by: Administrator