1. Database Reference
  2. Initialization Parameters
  3. Initialization Parameters
  4. SKIP_UNUSABLE_INDEXES

1.301 SKIP_UNUSABLE_INDEXES

SKIP_UNUSABLE_INDEXES enables or disables the use and reporting of tables with unusable indexes or index partitions.

Property Description

Parameter type

Boolean

Default value

true

Modifiable

ALTER SESSION, ALTER SYSTEM

Modifiable in a PDB

Yes

Range of values

true | false

Basic

No

If a SQL statement uses a hint that forces the usage of an unusable index, then this hint takes precedence over initialization parameter settings, including SKIP_UNUSABLE_INDEXES. If the optimizer chooses an unusable index, then an ORA-01502 error will result. (See Oracle Database Administrator’s Guide for more information about using hints.)

Values

  • true

    Disables error reporting of indexes and index partitions marked UNUSABLE. This setting allows all operations (inserts, deletes, updates, and selects) on tables with unusable indexes or index partitions.

    Note:

    If an index is used to enforce a UNIQUE constraint on a table, then allowing insert and update operations on the table might violate the constraint. Therefore, this setting does not disable error reporting for unusable indexes that are unique.

  • false

    Enables error reporting of indexes marked UNUSABLE. This setting does not allow inserts, deletes, and updates on tables with unusable indexes or index partitions.

See Also:

Oracle Database SQL Language Reference for more information about hints