SQL Error [54] [61000]: ORA-00054: resource is busy, but NOWAIT was specified to get resource, or timeout failed

Introduction:

oracle database execution script prompt:

SQL Error [54] [61000]: ORA-00054: resource is busy, but NOWAIT was specified to get resource, or timeout failed

Execute the script:

ALTER TABLE 表名 MODIFY (字段名 VARCHAR2(4000));

Solving script:

SELECT *
FROM 表名
FOR UPDATE WAIT 10;