使用此代码保持打开游标超出

Question

这是我不断收到的错误

SQL 错误：ORA-01000：超出最大打开游标 01000. 00000 - “超出最大打开游标”

这是我一直在处理的代码

DROP TABLE STUDENT; 

CREATE TABLE STUDENT 
(
   Student_ID NUMBER(5) NOT NULL ENABLE 
   ,F_NAME VARCHAR2(30) NOT NULL ENABLE 
   ,L_NAME VARCHAR2(30) NOT NULL ENABLE 
   ,HomePhone_Number NUMBER(10) 
   ,Home_Address     VARCHAR2(35) 
   ,City             VARCHAR2(35) 
   ,State            VARCHAR(2) 
   ,Zip_Code         NUMBER(5) 
   ,Spouse_FName     VARCHAR2(25) 
   ,Spouse_LName     VARCHAR2(25) 
   ,Enrolled_ID      NUMBER(10) 
   ,Academic_Advisor_ID NUMBER(5) 
   ,PRIMARY KEY (Student_ID) ENABLE 
); 

DROP TABLE FACULTY; 

CREATE TABLE FACULTY 
(
   Faculty_ID            NUMBER(5) NOT NULL ENABLE 
   ,F_Name               VARCHAR2(30) NOT NULL ENABLE 
   ,L_Name               VARCHAR2(30) NOT NULL ENABLE 
   ,OfficePhone_Numnber  NUMBER(10) 
   ,Office_Number        NUMBER(10) 
   ,PRIMARY KEY (Faculty_ID) ENABLE 
); 

DROP TABLE ADVISOR; 

CREATE TABLE ADVISOR 
(
   Student_ID  NUMBER(5), 
   Faculty_ID  NUMBER(5), 
   Advisor_TYPE VARCHAR2(20) 
); 

--INSERT VALUES INTO STUDENT 

INSERT INTO STUDENT VALUES 
(1,'Emily','Bronte',9542403843,'742 Evergreen Terrace','Springfield','IL',34567,'Jason','Bourne',1001); 

INSERT INTO STUDENT VALUES 
(2,'Alice','Walker',5481354795,'3584 NW 29th St','Mason','FL',17465,'Michael','Myers',1002); 

INSERT INTO STUDENT VALUES 
(3,'Kurt','Vonnegut',5481354796,'14 Blanchfield','Summer','FL',12444,'Jane','Vonnegut',1003); 

INSERT INTO STUDENT VALUES 
(4,'Isaac','Asimov',5481354743,'6754 N Riva Ridge Loop','Evans Mills','NY',13602,'April','Asimov',1004); 

INSERT INTO STUDENT VALUES 
(5,'Thomas','Elliot',5481354799,'6754 W Riva Ridge Loop','Evans Mills','NY',13602,'Sara','Elliot',1005); 

INSERT INTO STUDENT VALUES 
(6,'Louisa','Alcott',5481357117,'6754 S Riva Ridge Loop','Evans Mills','NY',13602,'Freddy','Alcott',1006); 

--INSERT VALUES INTO FACULTY 

INSERT INTO FACULTY VALUES(500,'Marth','Graham'); 
INSERT INTO FACULTY VALUES(501,'Mikhail','Baryshinokov'); 
INSERT INTO FACULTY VALUES(502,'Jerome', 'Robbins'); 
INSERT INTO FACULTY VALUES(503,'Arthur', 'Mitchell'); 
INSERT INTO FACULTY VALUES(504,'Kir','Jooss'); 

--INSERT VALUES INTO ADVISOR 

INSERT INTO ADVISOR VALUES( 1, 500, 'Academic Advisor'); 
INSERT INTO ADVISOR VALUES( 2, 501, 'Academic Advisor'); 
INSERT INTO ADVISOR VALUES( 3, 502, 'Academic Advisor'); 
INSERT INTO ADVISOR VALUES( 4, 503, 'Academic Advisor'); 
INSERT INTO ADVISOR VALUES( 5, 504, 'Academic Advisor'); 
INSERT INTO ADVISOR VALUES( 1, 502, 'Thesis Advisor'); 
INSERT INTO ADVISOR VALUES( 2, 504, 'Thesis Advisor'); 
INSERT INTO ADVISOR VALUES( 3, 503, 'Thesis Advisor'); 
INSERT INTO ADVISOR VALUES( 4, 501, 'Thesis Advisor'); 
INSERT INTO ADVISOR VALUES( 5, 500, 'Thesis Advisor'); 

COMMIT; 

SET AUTOTRACE ON; 

--QUERY : All students under a specific advisor 

SELECT FACULTY.Faculty_ID,FACULTY.F_Name,FACULTY.L_Name,STUDENT.Student_ID,F_Name,L_Name 
FROM STUDENT,FACULTY,ADVISOR 
WHERE (STUDENT.STUDENT_ID = ADVISOR.STUDENT_ID) AND 
(FACULTY.Faculty_ID = ADVISOR.Faculty_ID) 
ORDER BY FACULTY.Faculty_ID; 

CREATE UNIQUE INDEX index_name 
ON ADVISOR(Student_ID,Faculty_ID); 

SET AUTOTRACE ON; 

--QUERY : All students under a specific advisor 

SELECT FACULTY.Faculty_ID,FACULTY.F_Name,FACULTY.L_Name,STUDENT.Student_ID,F_Name,L_Name 
FROM STUDENT,FACULTY,ADVISOR 
WHERE (STUDENT.Student_ID = ADVISOR.Student_ID) AND 
(FACULTY.Faculty_ID = ADVISOR.Faculty_ID) 
ORDER BY FACULTY.Faculty_ID; 

在 Oracle SQL 开发人员的运行脚本上运行后，这是我得到的错误 错误报告 - SQL 错误：ORA-01000：超出最大打开游标 01000. 00000 - “超出最大打开游标” *原因：
*行动： 无法收集统计数据请不确定用户是否具有正确的访问权限。 统计功能要求授予用户对 v_$sesstat、v_$statname 和 v_$session 的选择权。

Answer 1

Oracle 默认最多可以容纳 300 个 open_cursors。

一种解决方案是增加 open_cursors 计数限制。 这可以通过下面的sql代码来完成

alter system set open_cursors = 2000 scope=both;

这是之前在此链接提出的问题： java.sql.SQLException: - ORA-01000: maximum open cursors exceeded 并且问题的描述要广泛得多。