Can MySQL\'s \'No Index Used\' Warning Trigger PHP Fatal Errors?

Unveiling the 'No Index Used' Warning and PHP's Fatal Error

Within the provided code snippet, you may encounter a fatal error accompanied by the message "No index used in query/prepared statement." This error indicates that no index has been utilized to enhance the efficiency of the database query. However, this warning is not the actual source of the error.

The true culprit resides in a combination of factors within your PHP code:

• Excessive MySQL Warnings: MySQL typically generates a multitude of warnings, including this one about missing indexes.
• Unfiltered Warnings with mysqli_report(MYSQLI_REPORT_ALL): Your code has specified mysqli_report(MYSQLI_REPORT_ALL), which configures MySQL to report all errors and warnings.
• Uncaught Exception: The mysqli_sql_exception thrown by MySQL due to the missing index is not handled within a try{}...catch(){} block, causing it to become a fatal error.

To resolve this issue, you can adopt either of the following approaches:

1. Adjust MySQL Warnings: Modify the mysqli_report setting to MYSQLI_REPORT_STRICT or MYSQLI_REPORT_OFF, or any value other than MYSQLI_REPORT_ALL.
2. Proper Error Handling: Implement try{} and catch(){} blocks to handle exceptions raised by mysqli_sql_exception. This approach is recommended for best practices.

The provided code schema exhibits an absence of an index on the "name" column of the "calc" table. Adding an index to the "name" column would expedite the query's execution by reducing the number of rows MySQL needs to search.

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