Hello, fellow tech enthusiasts! If you’re like me and have dipped your toes into the world of Oracle databases, you’ve likely encountered some tricky error messages. Today, we’re going on a deep dive into get_detailed_sqlerrm, an essential tool for managing Oracle errors. I’ve broken it down into bite-size sections so you can fully grasp its components. Let’s get started!
UTL_HTTP read_text Example
To kick things off, imagine trying to access web content from your Oracle database using the UTL_HTTP package. Trying to read web data with Oracle may sound daunting, but trust me, once you get the hang of it, it’s a piece of cake. Let’s walk through a classic read_text example.
Picture this: You want to fetch text from a website to incorporate into your Oracle application. Here’s a step-by-step example using UTL_HTTP.read_text:
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Set Up Your Environment: First, make sure you have the necessary privileges. Without them, Oracle’s ACL (Access Control List) will stop you right in your tracks.
1234567891011121314151617BEGINDBMS_NETWORK_ACL_ADMIN.CREATE_ACL(acl => 'example_acl.xml',description => 'Allow access to example.com',principal => 'HR',is_grant => TRUE,privilege => 'connect');DBMS_NETWORK_ACL_ADMIN.ASSIGN_ACL(acl => 'example_acl.xml',host => 'www.example.com');END;/ -
Initialize the Request:
123456789DECLAREreq UTL_HTTP.req;resp UTL_HTTP.resp;text VARCHAR2(32767);BEGINreq := UTL_HTTP.BEGIN_REQUEST('http://www.example.com'); -
Fetch Content:
12345678910resp := UTL_HTTP.GET_RESPONSE(req);UTL_HTTP.READ_TEXT(resp, text, 32767);DBMS_OUTPUT.PUT_LINE(text);UTL_HTTP.END_RESPONSE(resp);END;/ -
Close Connections Properly: Failure to end the response can leave lingering connections. More on that in a bit!
Fetching web content can be exhilarating, especially when you see it fit seamlessly into your application. Keep this simple framework handy as it comes in really useful.
Get_detailed_sqlerrm Oracle
Next up, let’s unravel get_detailed_sqlerrm. First and foremost, get_detailed_sqlerrm isn’t an official Oracle function or procedure, but a common term used in custom implementations to showcase how SQL errors can be tracked in greater detail. So, why should you care?
Picture this scenario: You’re troubleshooting a complex query, and Oracle throws an error. But alas, the standard SQLERRM doesn’t always provide the depth of information you need. Enter get_detailed_sqlerrm, a concept dedicated to detailed error logging.
You might already be thinking, “How do I incorporate this into my error handling?” Here’s a rudimentary approach:
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Custom Exception Logging: You can create a procedure that captures not only the error message (
SQLERRM) but also the error code (SQLCODE), and store it in a custom error log table.123456789101112131415161718CREATE TABLE error_log (error_date DATE,error_code NUMBER,error_msg VARCHAR2(4000));CREATE OR REPLACE PROCEDURE log_errorISBEGININSERT INTO error_log (error_date, error_code, error_msg)VALUES (SYSDATE, SQLCODE, SQLERRM);COMMIT;END;/ -
Enhancing Your Logic: Integrate this procedure into your existing PL/SQL logic, allowing you to call
log_errorwhenever an exception arises.1234567891011BEGIN-- Your critical operation hereEXCEPTIONWHEN OTHERS THENlog_error;RAISE; -- Re-raise the exception after loggingEND;/
This method isn’t just for logging errors. It offers a wealth of insights, tracking historical data to identify recurring issues, and allows for more informed decision-making.
What is SQLERRM and SQLCODE?
If you’re not entirely clear on what SQLERRM and SQLCODE entail, don’t fret. We’re going to clarify these fundamental concepts right now.
SQLERRM is a PL/SQL function that returns the message associated with the current error number. If you’ve encountered an error, calling SQLERRM without a parameter will give you the error text for the last error that occurred in your session.
Here’s what it looks like in action:
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DECLARE error_message VARCHAR2(255); BEGIN -- An intentional error SELECT 'example' / 0 INTO error_message FROM dual; EXCEPTION WHEN OTHERS THEN DBMS_OUTPUT.PUT_LINE(SQLERRM); END; / |
SQLCODE, on the other hand, returns the error number. Think of it as the numeric cousin of SQLERRM.
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DECLARE error_message VARCHAR2(255); error_number NUMBER; BEGIN -- Another intentional error SELECT 'example' / 0 INTO error_message FROM dual; EXCEPTION WHEN OTHERS THEN error_number := SQLCODE; DBMS_OUTPUT.PUT_LINE('Error code: ' || error_number); END; / |
Knowing these functions empowers you to build more resilient Oracle applications with robust error handling.
Get_detailed_sqlerrm Example
Let’s dive into a practical example of creating a get_detailed_sqlerrm function. I remember once during a complex data migration project, getting frequent enigmatic errors that nearly drove me crazy. This inspired me to simulate a more detailed error logging approach in our application logic.
The idea behind a get_detailed_sqlerrm approach is to provide detailed context whenever an Oracle error occurs, complementing the standard SQLERRM and SQLCODE output.
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CREATE OR REPLACE PROCEDURE get_detailed_sqlerrm IS l_code NUMBER; l_errmsg VARCHAR2(4000); l_line NUMBER; BEGIN -- Simulating an error SELECT 1/0 INTO l_code FROM dual; EXCEPTION WHEN OTHERS THEN l_code := SQLCODE; l_errmsg := SQLERRM; l_line := DBMS_UTILITY.FORMAT_ERROR_BACKTRACE; DBMS_OUTPUT.PUT_LINE('Error Code : ' || l_code); DBMS_OUTPUT.PUT_LINE('Error Message: ' || l_errmsg); DBMS_OUTPUT.PUT_LINE('Error Line : ' || l_line); END; / BEGIN get_detailed_sqlerrm; END; / |
Here’s what the above PL/SQL does:
- Capture the Error: The procedure deliberately introduces a divide-by-zero error to mimic an error scenario.
- Log Details: Captures error details—code, message, and backtrace line—to offer clarity on where things went off the rails.
- Output Information: Uses
DBMS_OUTPUT.PUT_LINEto print these details in the console for debugging.
Integrating such logic into your error-handling process can be a game-changer, especially when working in environments where tracking down errors can be like chasing ghosts.
UTL_HTTP Close All Connections
Managing HTTP connections with Oracle can get hairy if not done correctly. Ever found yourself troubleshooting a sluggish database, only to discover it’s due to open HTTP connections? Yeah, I’ve been there too. Let’s see how to handle this like a pro.
When your PL/SQL code fetches data over HTTP, it’s vital to explicitly close these connections. Otherwise, you might face network resource exhaustion or find performance tanking.
How to Close a Connection
Here’s how you can ensure that each HTTP connection is neatly closed after use:
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DECLARE req UTL_HTTP.req; resp UTL_HTTP.resp; BEGIN req := UTL_HTTP.BEGIN_REQUEST('http://www.example.com'); resp := UTL_HTTP.GET_RESPONSE(req); -- Your processing logic here UTL_HTTP.END_RESPONSE(resp); EXCEPTION WHEN OTHERS THEN DBMS_OUTPUT.PUT_LINE('An error occurred: ' || SQLERRM); -- Ensure to close connections even if an error occurs IF resp IS NOT NULL THEN UTL_HTTP.END_RESPONSE(resp); END IF; RAISE; END; / |
Things to Remember:
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Calling
UTL_HTTP.END_RESPONSE(): This call closes the HTTP response properly. Always use it even if you encounter errors. -
Catch Exceptions Sensibly: Use exception handling to guarantee that
END_RESPONSEis executed, even when an error disrupts the normal flow.
The next time you write DB code that fetches remote content, be sure to close your connections. Your database performance will thank you!
Ora-28759: Failure to Open File
This dreaded error has thrown many for a loop, myself included during a critical deployment. It usually creeps in when there’s an issue with SSL-related file permissions or formats.
The ORA-28759 error largely pertains to Oracle’s security layer. Usually, it signals issues when the WALLET_LOCATION parameter is incorrectly configured in your sqlnet.ora file. Let’s sort it out.
Steps to Address ORA-28759
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Check Your
sqlnet.ora: Ensure that theWALLET_LOCATIONentry points to the correct wallet directory. -
Validate SSL Files: Check that all SSL certificate files, especially wallets, have the right permissions. You may need to adjust them to grant Oracle the necessary access.
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Refresh Wallets: In some cases, wallets might need updating or recreating using Oracle Wallet Manager (OWM).
If you ever encounter such a file error, remember to maintain a detailed audit of your system file changes. Not only does it help in such cases, but it’s also beneficial if you need to roll changes back.
How to Get Oracle Error Message?
Finding Oracle error messages can sometimes feel like searching for a needle in a haystack. An Oracle error can be subtle or apparent, but knowing how to retrieve error messages efficiently is crucial for effective debugging.
Simple Example for Retrieving Error Messages
By tapping into Oracle’s built-in functions, we can retrieve error messages systematically. Here’s an example where SQLERRM shines:
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DECLARE value NUMBER; BEGIN value := 1 / 0; -- Purposefully Division by zero EXCEPTION WHEN OTHERS THEN DBMS_OUTPUT.PUT_LINE('Error occurred: ' || SQLERRM); END; / |
What happens here? When division by zero occurs:
- Error Code: Oracle generates an error code which
SQLCODEcan capture. - Error Message: Using
SQLERRM, you pull in the actual error message associated with the code.
If you’re not of fan of digging through logs (and who is, really?), implementing such error tracking code in your PL/SQL routines can save you countless hours.
What is the Sqlerrm Function in Oracle?
Once more, into the world of SQLERRM. No, it’s not a typo; this function deserves its own spotlight as it’s somewhat the rockstar of Oracle error management.
Practical Use of SQLERRM
The SQLERRM function plays a central role in Oracle’s error handling. It returns the error message corresponding to a particular error number, providing you a textual description of the error.
Structure and Syntax
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SQLERRM([error_number]) |
Here, the error_number is optional. If you omit it, SQLERRM takes the most recent error in your session and provides information on it. This is ideal for catching exceptions as they happen.
Example in Use
Try adding this snippet to your exception handling:
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BEGIN -- Some PL/SQL code that might fail EXCEPTION WHEN OTHERS THEN -- Outputs the error message to the console DBMS_OUTPUT.PUT_LINE(SQLERRM); END; / |
And that’s it! Harness the power of SQLERRM to capture detailed error messages alongside their error codes.
Ora-29024: Certificate Validation Failure
The ORA-29024 is a cryptic error that feels like Oracle’s certificate validation is gatekeeping your progress. Imagine you’re deploying an important application when suddenly this error stops you cold. I’ve been there, and here’s a roadmap to navigate past it.
Resolving ORA-29024
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Inspect Your Certificates: This error often arises from invalid, expired, or improperly stored certificates. Ensure all certificates are valid and match expectations.
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Check the Certificate Chain: The certificate chain can be a significant culprit. Confirm that client and server certificates are reliable and configured correctly.
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Review SQLNET Configurations: Double-check your
sqlnet.oraand related SSL configurations. They should point to valid, existing directories and certificates. -
Refresh Oracle Wallets: Rebuild or update the Oracle Wallet Manager configurations if issues persist.
When addressing certificate errors, remember that careful documentation is your friend. Keep detailed notes of configurations and changes for future reference.
How to Throw Exception in Oracle Stored Procedure?
Throwing exceptions in Oracle is like setting off fireworks in PL/SQL—potentially necessary for clarity but should be used wisely. Whether you’re handling routine logic or complex transactions, knowing how to issue exceptions directly in your stored procedures can be a lifesaver.
Throwing Exceptions with Grace
Oracle offers a neat mechanism for triggering exceptions, using RAISE and RAISE_APPLICATION_ERROR.
Simple Exception Throwing
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BEGIN -- Some operation error check IF some_error_condition THEN RAISE your_custom_exception; END IF; EXCEPTION WHEN your_custom_exception THEN DBMS_OUTPUT.PUT_LINE('Handled a custom exception'); END; / |
Using RAISE_APPLICATION_ERROR
This is how you can generate a user-defined error:
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BEGIN -- Operation that could fail RAISE_APPLICATION_ERROR(-20001, 'Custom error message'); EXCEPTION WHEN OTHERS THEN DBMS_OUTPUT.PUT_LINE('An application error occurred: ' || SQLERRM); END; / |
Leverage these methods to create more intuitive error management in your stored procedures. The key is clarity: make sure your error messages convey exactly what’s going wrong.
Ora-24247: Network Access Denied by Access Control List (ACL)
Oh, the infamous ORA-24247. Every time I see this one, it’s like welcoming an old, unwelcome friend. Somewhere along your development path, you might encounter network access barriers due to ACL restrictions in Oracle.
Fixing ORA-24247
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Review ACLs: It’s essential to ensure that ACLs allow your database to access external networks or resources. Use
DBMS_NETWORK_ACL_ADMINto inspect and adjust:123456789101112BEGINDBMS_NETWORK_ACL_ADMIN.assign_acl(acl => 'example-acl.xml',host => 'example.com',lower_port => 80,upper_port => 80);END;/ -
Manage Permissions: Enumerate permissions for critical users, ensuring they have the correct connect privileges.
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Audit and Troubleshoot: Keep track of changes. As ACLs are one of the more sensitive configurations, document your steps for troubleshooting and future references.
When you sort out your ACLs, it’s like resolving the final piece of a complex jigsaw puzzle—satisfying and crucial for your application’s success.
FAQs
What is the difference between SQLERRM and SQLCODE?
SQLERRM provides a textual message describing the error, while SQLCODE returns the numerical code associated with the error. They are often used together for comprehensive error management.
How do I address SSL errors in Oracle?
Start by checking your SSL certificate paths, renew or refresh them if expired, and ensure the WALLET_LOCATION in your Oracle configuration is correct.
What are custom exceptions in Oracle?
Custom exceptions are user-defined exception types raised using RAISE_APPLICATION_ERROR to tailor error handling for specific conditions within PL/SQL constructs.
How crucial is managing UTL_HTTP connections?
Very! Failure to close connections can lead to performance degradation and resource leakage, impacting the stability of your Oracle applications.
Can ORA-24247 affect application performance?
Indeed. This error prevents network access, restricting the application’s ability to communicate externally which could stifle performance and functionality.
And there you have it—an extensive journey into the get_detailed_sqlerrm world. By grasping these Oracle error management techniques, you’re well-equipped for smoother database operations. Thanks for sticking around! Feel free to reach out with questions or share your experiences. I’ll catch you in the next post!
