1.dblink过程中出现了ORA-01017: invalid username/password; logon denied ORA-02063: 紧接着 line (起自 CONN_YIXUN)
出现这个错误的原因是由于双方的版本不一致造成的，我们需要对用双引号将密码引起来，否则密码会被自动转化为大写：
2.ORA-01843无效的月份
to_date(R.STADATE,'yyyyMMdd')换成to_char(to_date(R.STADATE,'yyyy-MM-dd'),'yyyymmdd')
3.用UTL_FILE.PUT_LINE的时候记得对字符串长度有限制
4.如果想在控制台显示输出要用:set serveroutput on;
3.oracle把秒数转换成具体日期
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SELECT TO_DATE('1970-1-1','YYYY-MM-DD')+(155556848/(3600*24)) FROM DUAL