ORA-01489：Oracle數據庫11g企業版版本11.2.0.4.0中的字符串連接結果太長 - 64位生產

Question

我有此查詢在Oracle數據庫11g企業版版本11.2.0.4.0 - 64位生產中運行，PL/SQL發佈11.2.0.4.0 - 生產，CORE 11.2.0.4.0生產，TNS對Linux：版本11.2.0.4.0 - 生產，NLSRTL版11.2.0.4.0 - 生產

CREATE OR REPLACE FORCE VIEW "IOT"."V_USERS_AND_RIGHTS" ("USER_PRIMARY_UNIT", "LOGIN", "FIRST_NAME", "LAST_NAME", "UNIT_ROLE") AS 
    SELECT "USER_PRIMARY_UNIT","LOGIN","FIRST_NAME","LAST_NAME","UNIT_ROLE" 
FROM (
SELECT user_primary_unit,login, first_name, last_name, 
     LTRIM(MAX(SYS_CONNECT_BY_PATH(rights,'/')) 
     KEEP (DENSE_RANK LAST ORDER BY curr),'/') AS UNIT_ROLE 
     FROM 
     (SELECT login, 
       first_name, 
       last_name, 
       user_primary_unit, 
       rights, 
       ROW_NUMBER() OVER (PARTITION BY login ORDER BY rights) AS curr, 
       ROW_NUMBER() OVER (PARTITION BY login ORDER BY rights) -1 AS prev 
     FROM (select member0_.login, member0_.first_name first_name, unit2.unit_name user_primary_unit, member0_.last_name last_name, 
         CONCAT(CONCAT(unit.unit_name, ' - '), role3_.role_name) rights 
from 
    IOT_DEVICES.t_member member0_ 
inner join IOT_DEVICES.t_user member0_1_ on member0_.member_id=member0_1_.user_id 
inner join IOT_DEVICES.t_playable_role playedrole1_ on member0_.member_id=playedrole1_.user_id 
inner join IOT_DEVICES.t_unit_role unitrole2_ on playedrole1_.unit_role_id=unitrole2_.unit_role_id 
inner join IOT_DEVICES.t_role role3_ on unitrole2_.role_id=role3_.role_id 
inner join IOT_DEVICES.t_unit unit on unitrole2_.unit_id=unit.unit_id 
inner join IOT_DEVICES.t_unit unit2 on unit2.unit_id=member0_1_.primary_unit_id 
where current_date between playedrole1_.start_date and playedrole1_.end_date 
order by unit.unit_name 
)) 
GROUP BY login, first_name, last_name, user_primary_unit 
CONNECT BY prev = PRIOR curr AND login = PRIOR login 
START WITH curr = 1 
) 
ORDER BY user_PRIMARY_UNIT, FIRST_NAME, LAST_NAME; 

但我有此錯誤：

ORA-01489: result of string concatenation is too long 
01489. 00000 - "result of string concatenation is too long" 
*Cause: String concatenation result is more than the maximum size. 
*Action: Make sure that the result is less than the maximum size. 

即使我把所有這些變量：

SET LONG 2000000 
SET pagesize 50000 
set longchunk 1000 
set linesize 1000 

Answer 1

錯誤與sqlplus設置無關，而與Oracle DB中SQL引擎的varchar2大小限制無關。對於11g，限制是4000字節。

在處理您的查詢時，其中一個連接導致長度大於限制的字符串。

乍一看

... LTRIM(MAX(SYS_CONNECT_BY_PATH(rights,'/')) ... 

和

... CONCAT(CONCAT(unit.unit_name, ' - '), role3_.role_name) rights ... 

的組合可能會導致問題。要麼你有很多單位的權利，要麼你有很深的層次。