Table of Contents

• 1. Key SQL Logic in Source Oracle Database
• 2. Core Challenges in Migrating to OceanBase
• 3. SQL Refactoring Plan for the Target Database
• 4. Refactoring Summary

1. Key SQL Logic in Source Oracle Database

DELIMITER $$
...
-- Oracle-accepted syntax (contains full-width right parenthesis)
SELECT * FROM table WHERE id = 1 ）; -- full-width ')' causes OceanBase compilation failure
...
END;
$$

2. Core Challenges in Migrating to OceanBase

1. Oracle is more permissive with SQL symbols and can tolerate mixed full-width and half-width punctuation, while OceanBase strictly follows ANSI SQL standards. Full-width symbols can therefore cause parser failures. In complex stored procedures, these issues are easy to miss and costly to troubleshoot manually.

3. SQL Refactoring Plan for the Target Database

DELIMITER $$
...
-- Target-side fix
SELECT * FROM table WHERE id = 1 );   -- corrected to half-width symbol
...
END;
$$

4. Refactoring Summary

1. Automatic symbol normalization: replace full-width right parenthesis ） with half-width ) in SQL code.

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