ORA-01502 Oracle Index in Unusable State

When trying to perform query on Oracle tables with select SQL statement, Oracle returns the following error:

ORA-01502: index ’string.string’ or partition of such index is in unusable state

The error indicates an attempt has been made to access an index or index partition that has been marked unusable by a direct load or by a DDL operation.

The problem usually happens when using the Direct Path for the SQL*Loader, Direct Load or DDL operations. This requires enough temporary space to build all indexes of the table. If there is no enough space in TEMP tablespace, all rows will still be loaded and imported, but the indices are left with STATUS = ‘INVALID’.

Invalid indexes can be checked with a SELECT * from USER_INDEXES WHERE STATUS = ‘INVALID’; SQL statement.

Solution to this error is simple. You can:

  1. Drop the specified index and/or recreate the index
  2. Rebuild the specified index
  3. Rebuild the unusable index partition

Generally, the following SQL manipulation language will be able to rebuild the unusable index:

ALTER INDEX index_name REBUILD

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This entry was posted on Saturday, January 28th, 2006 at 4:07 pm and is filed under Databases. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.

4 Responses to “ORA-01502 Oracle Index in Unusable State”

  1. sandeep
    September 19th, 2006 22:28
    1

    What about with Oracle 9i option SKIP UNUSABLE INDEXES? Pls Explain.

  2. Kalle
    March 6th, 2007 16:51
    2

    At least in oracle10 the status could also be ‘UNUSABLE’

  3. ORA-01502: Indexes in unusable state « PSST0101
    February 6th, 2008 06:31
    3

    [...] ORA-01502 Oracle Index in Unusable State [...]

  4. sabry
    August 21st, 2008 14:49
    4

    thanks… the alter table fix worked

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