Скачать или смотреть How to Retrieve USERNAMEs with Oracle Client Versions Below 19c

This guide provides a clear guide on how to retrieve all USERNAMEs connected to an Oracle database using a client version lower than `19c`. Learn the SQL commands and best practices!
---
This video is based on the question https://stackoverflow.com/q/73900114/ asked by the user 'Learning_something_new' ( https://stackoverflow.com/u/4889441/ ) and on the answer https://stackoverflow.com/a/73908782/ provided by the user 'DanBoc' ( https://stackoverflow.com/u/4230780/ ) 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: Need to know all the USERNAME that is using the oracle client version less than 19c

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.
---
How to Retrieve USERNAMEs with Oracle Client Versions Below 19c

If you're working with Oracle databases, you might encounter scenarios where you need to identify which users are connecting with versions of the Oracle client that are less than 19c. This is a common requirement for database administrators who want to ensure compatibility and performance. In this post, we’ll explore how to effectively gather this information using SQL queries.

Understanding the Problem

The challenge presented is to find all the USERNAMEs connected to the database using an Oracle client version less than 19c. The initial SQL query run by the user failed to return the expected client version, displaying "Unknown" instead. This can lead to confusion, especially if you're certain that your client is correctly configured.

Initial SQL Query Review

The user shared the following SQL:

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

While this query aims to filter users by client version, it returned "Unknown" for the client version, indicating a deeper issue.

Solution: Improved SQL Query Approach

To address the problem effectively, we recommend a different approach using a view and Structured Query Language (SQL) Common Table Expressions (CTE). Here’s how you can do it:

Steps to Retrieve USERNAMEs with Client Versions

Create a View: Create a view of the connection information. This process simplifies retrieval.

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

Use a CTE: This allows you to select distinct connection information and convert it for better readability.

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

Final Selection: The final query brings it all together, retrieving the necessary user data.

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

Explanation of the New SQL Query

View Creation (xksusecon): This view pulls data from the system's connection table, making it easier to access and analyze.

Distinct Selection: The CTE (x) retrieves unique session information with a clearer format for the client version.

Final Selection Criteria: The main query pulls USERNAMEs along with the client version, filtering out background processes for a clearer, practical result.

Conclusion

By utilizing the correct SQL structure and commands, you can efficiently retrieve all USERNAMEs connected via Oracle clients below version 19c. This approach allows for clearer results and better management of your database environment. Always ensure that your queries are optimized and tested to reflect accurate connection information.

This method not only solves the immediate problem but also offers a clearer path forward in database administration regarding client versions and user connectivity.