文档解释
ORA-30375: materialized view cannot be considered fresh
Cause: If the materialized view is invalid or unusable, it cannot be considered fresh with the ALTER MATERIALIZED VIEW CONSIDER FRESH command.
Action: None
ORA-30375错误是由于物化视图的数据不新鲜时出现的。官方解释如下：
ORA-30375: materialized view cannot be considered fresh
Cause: An attempt was made to create a materialized view with a size limit that would require deleting some rows from its table in order to ensure that its contents is fresh.
Action: Increase the size limit so that the materialized view can always be considered fresh.
一般处理方法及步骤
1. 检查错误的触发原因，是否可能会出现删除视图记录的情况。
2. 如果确定触发原因，则使用alter语句修改物化视图的大小限制。
3. 重新执行物化视图操作，查看是否能正常创建物化视图。
