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How to Resolve ORA-01502 Error

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  • User AvatarKiran Dalvi
  • 13 Sep, 2023
  • 0 Comments
  • 1 Min Read

How to Resolve ORA-01502 Error

How to Resolve ORA-01502 Error

ORA-01502 means that the index that the optimizer want to use is in UNUSABLE state. so the solution is that  you can either rebuild it or work around it. Solution :
  1. Rebuild Index :
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SQL> ALTER INDEX EMP_SALARY;
 
Index altered.
 
Or rebuild it online:
 
SQL> ALTER INDEX EMP_SALARY ONLINE;
 
Index altered.
2. SKIP_UNUSABLE_INDEXES
 
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SQL> ALTER SESSION SET SKIP_UNUSABLE_INDEXES=TRUE;
 
Session altered.
3. Drop Index to Workaround ORA-01502
First of all, we need to disable the primary key constraint.
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SQL> ALTER TABLE EMP.PAY_HIST DISABLE CONSTRAINT SYS_C0082906;
 
Table altered.
Then drop the unique index.
SQL> DROP INDEX EMP.PAY_HIST_PK;
 
Index dropped.
Data Loading
Now, we can insert into the table.
SQL> INSERT /*+ APPEND */ INTO PAY_HIST SELECT * FROM PAY_HIST_BAK;
 
3128041760 rows created. Create Primary Key Index
We need to get the primary key back. First, create the original index.
SQL> CREATE UNIQUE INDEX EMP.PAY_HIST_PK ON EMP.PAY_HIST (PAY_ID, PAY_CUST_ID, ISSUE_DATE) ONLINE;
 
Index created.
Of course, creating such unique index of a big table may take some times to complete, but it's worth it overall.
The last step, we enable the primary key constraint.
SQL> ALTER TABLE EMP.PAY_HIST ENABLE CONSTRAINT SYS_C0082906;
 
Table altered.

Hope it Helps!