PostgresDB 22011: Substring Error

Substring operation failed.
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What is

PostgresDB 22011: Substring Error

 ?

When encountering error 22011: Substring Error in PostgreSQL, it typically means that the start position or length specified for a substring operation is incorrect, possibly beyond the actual length of the string. Here's what to do:

  1. Identify the Query Causing the Error:Use the PostgreSQL log files to find the query that led to the error. Look for the most recent entries around the time the error was reported. This step is crucial for further investigation.
  2. Analyze the Query:Examine the query to identify the SUBSTRING, SUBSTR, or similar string manipulation function calls. Pay special attention to the parameters being passed to these functions.
  3. Check the String Lengths:For the columns or values involved in the substring operation, check the actual data lengths. You can use a query like:
  4. SELECT LENGTH(your_column) FROM your_table WHERE some_condition;
  5. Replace your_column, your_table, and some_condition with the actual column name, table name, and condition to narrow down the problematic data.
  6. Test the Substring Operation Independently:Isolate the substring operation and run it with fixed values to ensure it behaves as expected. For example:
  7. SELECT SUBSTRING('example text' FROM 1 FOR 5);
  8. Adjust the operation to match the one from the problematic query.
  9. Correct the Query:Based on your findings, adjust the start position and length arguments in the substring function to ensure they are within the bounds of the actual string length. If dynamic values are used, you may need to add checks or conditions to prevent out-of-range values.
  10. Run the Corrected Query:Execute the corrected query to verify the error is resolved. Ensure the output is as expected.
  11. Monitor After Fix:After applying the fix, monitor the system for any recurrence of the error and check the performance and outcome of the corrected query.

Remember, without a database administrator, proceed with caution, especially when making changes to the database or queries to avoid unintended consequences.

Attached error: 
PostgresDB 22011: Substring Error
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