Logging SQL Errors for Debugging and Analysis
Logging Errors to a Table
Write a SQL query to log errors to a dedicated error log table.
Solution:
-- Create an error log table.
CREATE TABLE ErrorLog (
LogID INT IDENTITY(1,1) PRIMARY KEY,
ErrorMessage NVARCHAR(MAX),
ErrorTime DATETIME DEFAULT GETDATE()
);
BEGIN TRY
-- Simulate an error.
SELECT 1 / 0 AS Result;
END TRY
BEGIN CATCH
-- Log the error to the ErrorLog table.
INSERT INTO ErrorLog (ErrorMessage)
VALUES ('Error: ' + ERROR_MESSAGE());
END CATCH;
Explanation:
- Purpose of the Query :
- The goal is to log errors to a table for later analysis and debugging.
- Key Components :
- ErrorLog: A dedicated table for storing error details.
- INSERT INTO ErrorLog: Logs the error message and timestamp.
- Why Log Errors? :
- Logging errors provides a record of issues for troubleshooting and auditing.
- It helps identify recurring problems and improve system reliability.
- Real-World Application :
- In production systems, error logs are critical for monitoring application health.
Additional Notes:
- Include additional details like error severity, procedure name, or user context in the log.
- Regularly review and archive error logs to manage storage.
- Important Considerations:
- Ensure that the error log table is secure and accessible only to authorized users.
For more Practice: Solve these Related Problems:
- Write a SQL query to log errors along with the stored procedure name and line number where the error occurred.
- Write a SQL query to create a trigger that logs constraint violations into an error log table.
- Write a SQL query to archive old error logs older than 30 days into a separate table for historical analysis.
- Write a SQL query to generate a report of the top 10 most frequent errors from the error log table.
Go to:
PREV : Debugging Complex Queries with Execution Plans
NEXT : Identifying Bottlenecks with Query Profiling.
Have another way to solve this solution? Contribute your code (and comments) through Disqus.
What is the difficulty level of this exercise?
Test your Programming skills with w3resource's quiz.