You do understand dbms_lock is a package owned by SYS, don't you? OK. Carefully review all code that session runs. If needed, enable SQL trace preferably at level 12 ...

PL/SQL Developer中的查找/替换功能可以使用正则表达式，但无论是online help还是user's guide都没有看到相关的帮助。 我试了一下 ...