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Old November 13th, 2003, 03:55 PM
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Default How do you rebuild Index?

Hey guys, I'm still a little new to ORACLE, and I'm getting an ORACLE error: ORA-01502. I looked this error up and saw where people had stated that you need to "rebuild the index". How do you do that?
Thanks, any help would be appreciated.

Chris
 
Old November 19th, 2003, 10:55 PM
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Hi Chris,

As the error message suggests, your index has become unusable (either thru dataload or some ddl statements). I'll recreate a possible scenario for you. Please look at the execution sequence below:

-----------------------------------------------------------------------------
SQL> create table t ( x number, v varchar2(10) );

Table created.

SQL> create index t_n1 on t ( x ) ;

Index created.

SQL> insert into t (x, v) values ( 1, 'a' );

1 row created.

SQL> insert into t (x, v) values ( 2, 'b' );

1 row created.

SQL> commit;

Commit complete.

SQL> select * from t where x = 2;

         X V
---------- ----------
         2 b

SQL> alter index t_n1 unusable; -- something like this has happened to your index

Index altered.

SQL> select * from t where x = 2; -- u try to access an unusable index
select * from t where x = 2
*
ERROR at line 1:
ORA-01502: index 'C5489.T_N1' or partition of such index is in unusable state

SQL> alter index t_n1 rebuild; -- now rebuild the index

Index altered.

SQL> select * from t where x = 2;

         X V
---------- ----------
         2 b

SQL>

-----------------------------------------------------------------------------

You need to find out which index is being accessed and rebuild it. You may get the information about the status of the index as follows:

-----------------------------------------------------------------------------
SQL> select index_name, status from user_indexes where index_name = 'T_N1' ;

INDEX_NAME STATUS
------------------------------ --------
T_N1 VALID

SQL> alter index t_n1 unusable;

Index altered.

SQL> select index_name, status from user_indexes where index_name = 'T_N1' ;

INDEX_NAME STATUS
------------------------------ --------
T_N1 UNUSABLE

SQL>
-----------------------------------------------------------------------------

You may refer to some excellent information on indexes in the Oracle documentation - "Oracle 8i Administrator's guide" and "Designing and tuning for performance".

Hope that helps.

Cheers,
Prat






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