How to Diagnose and Fix the ORA-01487 Error in Oracle

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If you encounter the ORA-01487 “no more tables permitted in this cluster” error in Oracle, it means that you have reached the maximum number of tables allowed in a cluster. This error typically occurs when you try to create a new table within a cluster that has already reached its limit.

Here are some steps to diagnose and fix the ORA-01487 error:

Diagnosing the Error

To diagnose the ORA-01487 error, you can use the following SQL query to check the number of tables in the cluster:

SELECT COUNT(*) FROM user_tables WHERE cluster_name = 'your_cluster_name';

Replace ‘your_cluster_name’ with the name of your cluster. If the count returned is equal to the maximum number of tables allowed in the cluster, then you have reached the limit and need to take corrective action.

Fixing the Error

There are a few different ways to fix the ORA-01487 error:

1. Remove or relocate tables from the cluster:
– You can remove tables from the cluster using the following SQL command:

     ALTER TABLE table_name NOCLUSTER;

– Alternatively, you can create a new cluster and move some tables from the existing cluster to the new one using the following steps:
– Create a new cluster using the CREATE CLUSTER statement.
– Use the ALTER TABLE … MOVE statement to move tables from the existing cluster to the new one.

2. Increase the maximum number of tables allowed in the cluster:
– If removing or relocating tables is not feasible, you can increase the maximum number of tables allowed in the cluster by altering the cluster using the following SQL command:

     ALTER CLUSTER your_cluster_name SIZE new_size;

– Replace ‘your_cluster_name’ with the name of your cluster and ‘new_size’ with the desired new maximum size.

3. Consider redesigning your database schema:
– If you consistently encounter the ORA-01487 error, it may be a sign that your database schema needs to be re-evaluated. Consider redesigning your schema to distribute tables across multiple clusters or remove the dependency on clusters altogether.

Conclusion

In conclusion, the ORA-01487 “no more tables permitted in this cluster” error in Oracle indicates that the maximum number of tables allowed in a cluster has been reached. By diagnosing the error and implementing one of the suggested fixes, you can resolve the issue and prevent it from occurring in the future.

For more information on the ORA-01487 error and its potential solutions, refer to the Oracle documentation or consult with a database administrator.

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