錯(cuò)誤提示：

ERROR at line 1:
ORA-20000: ORU-10027: buffer overflow, limit of 1000000 bytes
ORA-06512: at “SYS.DBMS_OUTPUT”, line 32
ORA-06512: at “SYS.DBMS_OUTPUT”, line 97
ORA-06512: at “SYS.DBMS_OUTPUT”, line 112
ORA-06512: at BNZF.BNQUERYLINE 138
ORA-06512: at line 3

查閱了一下文檔，這里貼出一些與本錯(cuò)誤有關(guān)的信息：

DBMS_OUTPUT.ENABLE (buffer_size IN INTEGER DEFAULT 20000)

PUT and PUT_LINE Procedure Exceptions:
ORA-20000, ORU-10027: Buffer overflow, limit of <buf_limit> bytes.
ORA-20000, ORU-10028: Line length overflow, limit of 32767 bytes for each line

Usage Notes
1)You can build a line of information piece by piece by making multiple calls to PUT, or place an entire line of information into the buffer by calling PUT_LINE.
2)When you call PUT_LINE the item you specify is automatically followed by an end-of-line marker. If you make calls to PUT to build a line, then you must add your own end-of-line marker by calling NEW_LINE. GET_LINE and GET_LINES do not return lines that have not been terminated with a newline character.
3)If your lines exceeds the line limit, you receive an error message.
4)Output that you create using PUT or PUT_LINE is buffered. The output cannot be retrieved until the PL/SQL program unit from which it was buffered returns to its caller.
For example, SQL*Plus does not display DBMS_OUTPUT messages until the PL/SQL program completes. There is no mechanism for flushing the DBMS_OUTPUT buffers within the PL/SQL program. For example:

SQL> SET SERVEROUTPUT ON
SQL> BEGIN
?? 2 DBMS_OUTPUT.PUT_LINE (‘hello’);
?? 3 DBMS_LOCK.SLEEP (10);
?? 4 END;

????? 很顯然當(dāng)我們?cè)谳敵鰰r(shí),控制輸出結(jié)果的緩沖大小由DBMS_OUTPUT.ENABLE控制,buffer size默認(rèn)為20000,每行最大的限制是32k,后面的一個(gè)例子是用來(lái)說(shuō)明存儲(chǔ)過(guò)程是在緩存了所有數(shù)據(jù)后才將結(jié)果返回。所以當(dāng)我們使用游標(biāo)進(jìn)行輸出 時(shí)，如果結(jié)果很多，將會(huì)超過(guò)這個(gè)值報(bào)ORA-20000, ORU-10027: Buffer overflow, limit of <buf_limit> bytes這個(gè)錯(cuò)誤
解決方法：
在存儲(chǔ)過(guò)程begin后面加?:? DBMS_OUTPUT.ENABLE (buffer_size=>null)???? 表示沒(méi)有限制

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