Скачать или смотреть How to Order by HIGHVALUE on User Tab Partitions in Oracle Without Errors

Learn how to sort user tab partitions by high value in Oracle, avoiding common errors like ORA-00997. Discover the right approach to handle table partitions safely.
---
This video is based on the question https://stackoverflow.com/q/69819825/ asked by the user 'Sumit Sood' ( https://stackoverflow.com/u/1784675/ ) and on the answer https://stackoverflow.com/a/69820327/ provided by the user 'Andrew Sayer' ( https://stackoverflow.com/u/9856176/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: order by HIGHVALUE on user_tab_partitions in Oracle

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
---
Understanding Oracle Partitions and Their Challenges

When working with large datasets in Oracle databases, partitions allow for efficient data management. However, they can present unique challenges, especially when you need to access data in a specific order. A common situation many developers face is ordering partitions by their high_value.

Imagine you're trying to run the following query in a PL/SQL block to get details about table partitions for a specific table called BRD_JOB_DETAILS_TMP:

[[See Video to Reveal this Text or Code Snippet]]

Unfortunately, this well-meaning query can throw an error: ORA-00997: illegal use of LONG datatype. This error suggests that the high_value field cannot be used in the ORDER BY clause directly because it may involve a LONG datatype that is not allowed for sorting.

The Problem with ORA-00997

The ORA-00997 error introduces a significant obstacle when you need to process table partitions in a specific order. It may also lead to additional errors, such as:

ORA-14074: This error implies that the current partition bound isn't higher than the last partition, which can complicate your partition management and data operations.

Solution: Ordering by partition_position

To successfully retrieve the partition details and avoid these errors, the recommended approach is to use the numeric column partition_position for ordering instead of high_value.

Updated Query

Replace your previous query with the following:

[[See Video to Reveal this Text or Code Snippet]]

Benefits of This Approach

Bypass Long Datatype Restrictions: Using partition_position ensures that you avoid issues related to sorting on LONG datatypes which can trigger the ORA-00997 error.

Organized Data Handling: This method allows you to manage and view your partitions in the correct order, addressing the ORA-14074 error effectively.

Conclusion

When dealing with table partitions in Oracle, it's crucial to know how to sort them correctly without running into datatype issues. By utilizing partition_position instead of high_value, you can streamline your querying process, ensuring both safety and efficiency in your database operations.

Implement these changes to maintain smooth database functionality and stay productive in your development work!