[20190603]关于dbms_output输出问题.txt

[20190603]关于dbms_output输出问题.txt --//以前遇到的问题,重新做一个记录: --//链接:http://www.itpub.net/thread-2096243-1-1.html 1.环境: SYS@book> @ ver1 PORT_STRING         VERSION    BANNER ------------------- ---------- ---------------------------------------------------------------------------- x86_64/Linux 2.4.xx 11.2.0.4.0 Oracle Database 11g Enterprise Edition Release 11.2.0.4.0 - 64bit Production 2.测试: SCOTT@book> set serveroutput OFF SCOTT@book> call dbms_output.enable(1e6); Call completed. SCOTT@book> exec DBMS_OUTPUT.put_line ('this is a first test!'); PL/SQL procedure successfully completed. --//现在不显示是正常的。因为设置serveroutput OFF. SCOTT@book> set serverout on SCOTT@book> exec DBMS_OUTPUT.put_line ('this is a second test!'); this is a first test! this is a second test! PL/SQL procedure successfully completed. --//OK,现在把在缓存的第一行一起显示出来,出现了2行,主要我打开了dbms_output.enable(1e6)，缺省这个是disable。再次执行就不会了。 SCOTT@book> exec DBMS_OUTPUT.put_line ('this is a third test!'); this is a third test! PL/SQL procedure successfully completed. --//但是如果执行set serveroutput OFF后没有执行call dbms_output.enable(1e6);缓存就关闭了. 3.继续测试: SCOTT@book> set serverout off SCOTT@book> exec DBMS_OUTPUT.put_line ('this is a 111 test!'); PL/SQL procedure successfully completed. SCOTT@book> set serverout on SCOTT@book> exec DBMS_OUTPUT.put_line ('this is a 222 test!'); this is a 222 test! PL/SQL procedure successfully completed.