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详细解答可以参考官方帮助文档   1. 在网上下载最新版本的wordpress程序。本文以DedeCMS-V5.7-UTF8-SP1.tar.gz为例安装。 2. 将Dede程序通过FTP上传到主机上的htdocs目录。   3. 在主机控制台将程序解压到根目录。   4. 将解压后的 upload 目录下的文件全部移动到 /htdocs 目录。本例中的 Filezilla 客户端直接全选文件，使用鼠 标拖动到 /htdocs 目录即可。   5. 确保 /htdocs目录下有index.php 文件。 访问主机临时域名即可开始安装。 6. 请注意数据库的配置方法。数据库的连接地址不是 localhost，而是主机管理控制台> 数据库信息页面中的数据库信息。   7. 之后单击下一步即可完成安装。     注：以上帐号和密码信息均为测试信息，非真实用户帐号密码，请您在实际操作过程中使用您服务器和数据库的帐号密码代替即可。     如果问题还未能解决，请联系售后技术支持。    

详细解答可以参考官方帮助文档 通过本文档中的示例，Oracle 用户可以快速了解 PPAS 数据库中的术语及概念，以便在迁移及开发过程中提高效率。 以下所有操作基于一个基础模型，通过此模型用户可以看到 RDS for PPAS 中最基本的创建数据库、创建数据表、管理用户等操作，基础数据模型如下： 同时，为了模拟 Oracle 上类似的环境，我们会建立一名字为 orcl_ppas 的数据库（database），在此数据库中建立名为 scott 的用户，并建立与这个用户同名的 schema 用户空间。 PPAS兼容性手册 关于PPAS兼容性说明的完整内容，请参见阿里云PPAS兼容性手册。 连接数据库 psql psql -h ppasaddress.ppas.rds.aliyuncs.com -p 3433 -U myuser -d template1 用户 myuser 的口令： psql.bin (9.4.1.3, 服务器 9.3.5.14) 输入 'help' 来获取帮助信息. template1=> 创建并连接数据库 CREATE DATABASE template1=> CREATE DATABASE orcl_ppas; CREATE DATABASE template1=> \c orcl_ppas psql.bin (9.4.1.3, 服务器 9.3.5.14) 创建普通用户 CREATE ROLE orcl_ppas=> CREATE ROLE scott LOGIN PASSWORD 'scott123'; CREATE ROLE 创建用户的私有空间 CREATE SCHEMA orcl_ppas=> CREATE SCHEMA scott; CREATE SCHEMA orcl_ppas=> GRANT scott TO myuser; GRANT ROLE orcl_ppas=> ALTER SCHEMA scott OWNER TO scott; ALTER SCHEMA orcl_ppas=> REVOKE scott FROM myuser; REVOKE ROLE 说明 如果在进行 ALTER SCHEMA scott OWNER TO scott 之前没有将 scott 加入到 myuser 角色，将会出现如下权限问题。ERROR:must be member of role 'scott' 从安全角度出发，在处理完 OWNER 的授权后，请将 scott 用户移出 myuser 角色以提高安全性。 连接到 orcl_ppas 数据库 说明 此步骤十分重要，以下所有操作都是在 scott 账号下进行的，否则所建立的数据表及各种数据库对象将不属于 scott用户，导致权限问题。 [root@localhost bin]# ./psql -h ppasaddress.ppas.rds.aliyuncs.com -p 3433 -U scott -d orcl_ppas 用户 scott 的口令： psql.bin (9.4.1.3, 服务器 9.3.5.14) 输入 'help' 来获取帮助信息. orcl_ppas=> 创建数据表 CREATE TABLE CREATE TABLE dept ( deptno NUMBER(2) NOT NULL CONSTRAINT dept_pk PRIMARY KEY, dname VARCHAR2(14) CONSTRAINT dept_dname_uq UNIQUE, lock VARCHAR2(13) ); CREATE TABLE emp ( empno NUMBER(4) NOT NULL CONSTRAINT emp_pk PRIMARY KEY, ename VARCHAR2(10), job VARCHAR2(9), mgr NUMBER(4), hiredate DATE, sal NUMBER(7,2) CONSTRAINT emp_sal_ck CHECK (sal > 0), comm NUMBER(7,2), deptno NUMBER(2) CONSTRAINT emp_ref_dept_fk REFERENCES dept(deptno) ); CREATE TABLE jobhist ( empno NUMBER(4) NOT NULL, startdate DATE NOT NULL, enddate DATE, job VARCHAR2(9), sal NUMBER(7,2), comm NUMBER(7,2), deptno NUMBER(2), chgdesc VARCHAR2(80), CONSTRAINT jobhist_pk PRIMARY KEY (empno, startdate), CONSTRAINT jobhist_ref_emp_fk FOREIGN KEY (empno) REFERENCES emp(empno) ON DELETE CASCADE, CONSTRAINT jobhist_ref_dept_fk FOREIGN KEY (deptno) REFERENCES dept (deptno) ON DELETE SET NULL, CONSTRAINT jobhist_date_chk CHECK (startdate 创建视图 CREATE OR REPLACE VIEW CREATE OR REPLACE VIEW salesemp AS SELECT empno, ename, hiredate, sal, comm FROM emp WHERE job = 'SALESMAN'; 创建序列 CREATE SEQUENCE CREATE SEQUENCE next_empno START WITH 8000 INCREMENT BY 1; 插入数据 INSERT INTO INSERT INTO dept VALUES (10,'ACCOUNTING','NEW YORK'); INSERT INTO dept VALUES (20,'RESEARCH','DALLAS'); INSERT INTO dept VALUES (30,'SALES','CHICAGO'); INSERT INTO dept VALUES (40,'OPERATIONS','BOSTON'); INSERT INTO emp VALUES (7369,'SMITH','CLERK',7902,'17-DEC-80',800,NULL,20); INSERT INTO emp VALUES (7499,'ALLEN','SALESMAN',7698,'20-FEB-81',1600,300,30); INSERT INTO emp VALUES (7521,'WARD','SALESMAN',7698,'22-FEB-81',1250,500,30); INSERT INTO emp VALUES (7566,'JONES','MANAGER',7839,'02-APR-81',2975,NULL,20); INSERT INTO emp VALUES (7654,'MARTIN','SALESMAN',7698,'28-SEP-81',1250,1400,30); INSERT INTO emp VALUES (7698,'BLAKE','MANAGER',7839,'01-MAY-81',2850,NULL,30); INSERT INTO emp VALUES (7782,'CLARK','MANAGER',7839,'09-JUN-81',2450,NULL,10); INSERT INTO emp VALUES (7788,'SCOTT','ANALYST',7566,'19-APR-87',3000,NULL,20); INSERT INTO emp VALUES (7839,'KING','PRESIDENT',NULL,'17-NOV-81',5000,NULL,10); INSERT INTO emp VALUES (7844,'TURNER','SALESMAN',7698,'08-SEP-81',1500,0,30); INSERT INTO emp VALUES (7876,'ADAMS','CLERK',7788,'23-MAY-87',1100,NULL,20); INSERT INTO emp VALUES (7900,'JAMES','CLERK',7698,'03-DEC-81',950,NULL,30); INSERT INTO emp VALUES (7902,'FORD','ANALYST',7566,'03-DEC-81',3000,NULL,20); INSERT INTO emp VALUES (7934,'MILLER','CLERK',7782,'23-JAN-82',1300,NULL,10); INSERT INTO jobhist VALUES (7369,'17-DEC-80',NULL,'CLERK',800,NULL,20,'New Hire'); INSERT INTO jobhist VALUES (7499,'20-FEB-81',NULL,'SALESMAN',1600,300,30,'New Hire'); INSERT INTO jobhist VALUES (7521,'22-FEB-81',NULL,'SALESMAN',1250,500,30,'New Hire'); INSERT INTO jobhist VALUES (7566,'02-APR-81',NULL,'MANAGER',2975,NULL,20,'New Hire'); INSERT INTO jobhist VALUES (7654,'28-SEP-81',NULL,'SALESMAN',1250,1400,30,'New Hire'); INSERT INTO jobhist VALUES (7698,'01-MAY-81',NULL,'MANAGER',2850,NULL,30,'New Hire'); INSERT INTO jobhist VALUES (7782,'09-JUN-81',NULL,'MANAGER',2450,NULL,10,'New Hire'); INSERT INTO jobhist VALUES (7788,'19-APR-87','12-APR-88','CLERK',1000,NULL,20,'New Hire'); INSERT INTO jobhist VALUES (7788,'13-APR-88','04-MAY-89','CLERK',1040,NULL,20,'Raise'); INSERT INTO jobhist VALUES (7788,'05-MAY-90',NULL,'ANALYST',3000,NULL,20,'Promoted to Analyst'); INSERT INTO jobhist VALUES (7839,'17-NOV-81',NULL,'PRESIDENT',5000,NULL,10,'New Hire'); INSERT INTO jobhist VALUES (7844,'08-SEP-81',NULL,'SALESMAN',1500,0,30,'New Hire'); INSERT INTO jobhist VALUES (7876,'23-MAY-87',NULL,'CLERK',1100,NULL,20,'New Hire'); INSERT INTO jobhist VALUES (7900,'03-DEC-81','14-JAN-83','CLERK',950,NULL,10,'New Hire'); INSERT INTO jobhist VALUES (7900,'15-JAN-83',NULL,'CLERK',950,NULL,30,'Changed to Dept 30'); INSERT INTO jobhist VALUES (7902,'03-DEC-81',NULL,'ANALYST',3000,NULL,20,'New Hire'); INSERT INTO jobhist VALUES (7934,'23-JAN-82',NULL,'CLERK',1300,NULL,10,'New Hire'); 查询优化器数据分析 ANALYZE ANALYZE dept; ANALYZE emp; ANALYZE jobhist; 建立存储过程 CREATE PROCEDURE CREATE OR REPLACE PROCEDURE list_emp IS v_empno NUMBER(4); v_ename VARCHAR2(10); CURSOR emp_cur IS SELECT empno, ename FROM emp ORDER BY empno; BEGIN OPEN emp_cur; DBMS_OUTPUT.PUT_LINE('EMPNO ENAME'); DBMS_OUTPUT.PUT_LINE('----- -------'); LOOP FETCH emp_cur INTO v_empno, v_ename; EXIT WHEN emp_cur%NOTFOUND; DBMS_OUTPUT.PUT_LINE(v_empno || ' ' || v_ename); END LOOP; CLOSE emp_cur; END; -- -- Procedure that selects an employee row given the employee -- number and displays certain columns. -- CREATE OR REPLACE PROCEDURE select_emp ( p_empno IN NUMBER ) IS v_ename emp.ename%TYPE; v_hiredate emp.hiredate%TYPE; v_sal emp.sal%TYPE; v_comm emp.comm%TYPE; v_dname dept.dname%TYPE; v_disp_date VARCHAR2(10); BEGIN SELECT ename, hiredate, sal, NVL(comm, 0), dname INTO v_ename, v_hiredate, v_sal, v_comm, v_dname FROM emp e, dept d WHERE empno = p_empno AND e.deptno = d.deptno; v_disp_date := TO_CHAR(v_hiredate, 'MM/DD/YYYY'); DBMS_OUTPUT.PUT_LINE('Number : ' || p_empno); DBMS_OUTPUT.PUT_LINE('Name : ' || v_ename); DBMS_OUTPUT.PUT_LINE('Hire Date : ' || v_disp_date); DBMS_OUTPUT.PUT_LINE('Salary : ' || v_sal); DBMS_OUTPUT.PUT_LINE('Commission: ' || v_comm); DBMS_OUTPUT.PUT_LINE('Department: ' || v_dname); EXCEPTION WHEN NO_DATA_FOUND THEN DBMS_OUTPUT.PUT_LINE('Employee ' || p_empno || ' not found'); WHEN OTHERS THEN DBMS_OUTPUT.PUT_LINE('The following is SQLERRM:'); DBMS_OUTPUT.PUT_LINE(SQLERRM); DBMS_OUTPUT.PUT_LINE('The following is SQLCODE:'); DBMS_OUTPUT.PUT_LINE(SQLCODE); END; -- -- Procedure that queries the 'emp' table based on -- department number and employee number or name. Returns -- employee number and name as IN OUT parameters and job, -- hire date, and salary as OUT parameters. -- CREATE OR REPLACE PROCEDURE emp_query ( p_deptno IN NUMBER, p_empno IN OUT NUMBER, p_ename IN OUT VARCHAR2, p_job OUT VARCHAR2, p_hiredate OUT DATE p_sal OUT NUMBER ) IS BEGIN SELECT empno, ename, job, hiredate, sal INTO p_empno, p_ename, p_job, p_hiredate, p_sal FROM emp WHERE deptno = p_deptno AND (empno = p_empno OR ename = UPPER(p_ename)); END; -- -- Procedure to call 'emp_query_caller' with IN and IN OUT -- parameters. Displays the results received from IN OUT and -- OUT parameters. -- CREATE OR REPLACE PROCEDURE emp_query_caller IS v_deptno NUMBER(2); v_empno NUMBER(4); v_ename VARCHAR2(10); v_job VARCHAR2(9); v_hiredate DATE; v_sal NUMBER; BEGIN v_deptno := 30; v_empno := 0; v_ename := 'Martin'; emp_query(v_deptno, v_empno, v_ename, v_job, v_hiredate, v_sal); DBMS_OUTPUT.PUT_LINE('Department : ' || v_deptno); DBMS_OUTPUT.PUT_LINE('Employee No: ' || v_empno); DBMS_OUTPUT.PUT_LINE('Name : ' || v_ename); DBMS_OUTPUT.PUT_LINE('Job : ' || v_job); DBMS_OUTPUT.PUT_LINE('Hire Date : ' || v_hiredate); DBMS_OUTPUT.PUT_LINE('Salary : ' || v_sal); EXCEPTION WHEN TOO_MANY_ROWS THEN DBMS_OUTPUT.PUT_LINE('More than one employee was selected'); WHEN NO_DATA_FOUND THEN DBMS_OUTPUT.PUT_LINE('No employees were selected'); END; 建立函数 CREATE FUNCTION CREATE OR REPLACE FUNCTION emp_comp ( p_sal NUMBER, p_comm NUMBER ) RETURN NUMBER IS BEGIN RETURN (p_sal + NVL(p_comm, 0)) * 24; END; -- -- Function that gets the next number from sequence, 'next_empno', -- and ensures it is not already in use as an employee number. -- CREATE OR REPLACE FUNCTION new_empno RETURN NUMBER IS v_cnt INTEGER := 1; v_new_empno NUMBER; BEGIN WHILE v_cnt > 0 LOOP SELECT next_empno.nextval INTO v_new_empno FROM dual; SELECT COUNT(*) INTO v_cnt FROM emp WHERE empno = v_new_empno; END LOOP; RETURN v_new_empno; END; -- -- EDB-SPL function that adds a new clerk to table 'emp'. This function -- uses package 'emp_admin'. -- CREATE OR REPLACE FUNCTION hire_clerk ( p_ename VARCHAR2, p_deptno NUMBER ) RETURN NUMBER IS v_empno NUMBER(4); v_ename VARCHAR2(10); v_job VARCHAR2(9); v_mgr NUMBER(4); v_hiredate DATE; v_sal NUMBER(7,2); v_comm NUMBER(7,2); v_deptno NUMBER(2); BEGIN v_empno := new_empno; INSERT INTO emp VALUES (v_empno, p_ename, 'CLERK', 7782, TRUNC(SYSDATE), 950.00, NULL, p_deptno); SELECT empno, ename, job, mgr, hiredate, sal, comm, deptno INTO v_empno, v_ename, v_job, v_mgr, v_hiredate, v_sal, v_comm, v_deptno FROM emp WHERE empno = v_empno; DBMS_OUTPUT.PUT_LINE('Department : ' || v_deptno); DBMS_OUTPUT.PUT_LINE('Employee No: ' || v_empno); DBMS_OUTPUT.PUT_LINE('Name : ' || v_ename); DBMS_OUTPUT.PUT_LINE('Job : ' || v_job); DBMS_OUTPUT.PUT_LINE('Manager : ' || v_mgr); DBMS_OUTPUT.PUT_LINE('Hire Date : ' || v_hiredate); DBMS_OUTPUT.PUT_LINE('Salary : ' || v_sal); DBMS_OUTPUT.PUT_LINE('Commission : ' || v_comm); RETURN v_empno; EXCEPTION WHEN OTHERS THEN DBMS_OUTPUT.PUT_LINE('The following is SQLERRM:'); DBMS_OUTPUT.PUT_LINE(SQLERRM); DBMS_OUTPUT.PUT_LINE('The following is SQLCODE:'); DBMS_OUTPUT.PUT_LINE(SQLCODE); RETURN -1; END; -- -- PostgreSQL PL/pgSQL function that adds a new salesman -- to table 'emp'. -- CREATE OR REPLACE FUNCTION hire_salesman ( p_ename VARCHAR, p_sal NUMERIC, p_comm NUMERIC ) RETURNS NUMERIC AS $$ DECLARE v_empno NUMERIC(4); v_ename VARCHAR(10); v_job VARCHAR(9); v_mgr NUMERIC(4); v_hiredate DATE; v_sal NUMERIC(7,2); v_comm NUMERIC(7,2); v_deptno NUMERIC(2); BEGIN v_empno := new_empno(); INSERT INTO emp VALUES (v_empno, p_ename, 'SALESMAN', 7698, CURRENT_DATE, p_sal, p_comm, 30); SELECT INTO v_empno, v_ename, v_job, v_mgr, v_hiredate, v_sal, v_comm, v_deptno empno, ename, job, mgr, hiredate, sal, comm, deptno FROM emp WHERE empno = v_empno; RAISE INFO 'Department : %', v_deptno; RAISE INFO 'Employee No: %', v_empno; RAISE INFO 'Name : %', v_ename; RAISE INFO 'Job : %', v_job; RAISE INFO 'Manager : %', v_mgr; RAISE INFO 'Hire Date : %', v_hiredate; RAISE INFO 'Salary : %', v_sal; RAISE INFO 'Commission : %', v_comm; RETURN v_empno; EXCEPTION WHEN OTHERS THEN RAISE INFO 'The following is SQLERRM:'; RAISE INFO '%', SQLERRM; RAISE INFO 'The following is SQLSTATE:'; RAISE INFO '%', SQLSTATE; RETURN -1; END; 建立规则 CREATE RULE CREATE OR REPLACE RULE salesemp_i AS ON INSERT TO salesemp DO INSTEAD INSERT INTO emp VALUES (NEW.empno, NEW.ename, 'SALESMAN', 7698, NEW.hiredate, NEW.sal, NEW.comm, 30); CREATE OR REPLACE RULE salesemp_u AS ON UPDATE TO salesemp DO INSTEAD UPDATE emp SET empno = NEW.empno, ename = NEW.ename, hiredate = NEW.hiredate, sal = NEW.sal, comm = NEW.comm WHERE empno = OLD.empno; CREATE OR REPLACE RULE salesemp_d AS ON DELETE TO salesemp DO INSTEAD DELETE FROM emp WHERE empno = OLD.empno; 建立触发器 CREATE TRIGGER CREATE OR REPLACE TRIGGER user_audit_trig AFTER INSERT OR UPDATE OR DELETE ON emp DECLARE v_action VARCHAR2(24); BEGIN IF INSERTING THEN v_action := ' added employee(s) on '; ELSIF UPDATING THEN v_action := ' updated employee(s) on '; ELSIF DELETING THEN v_action := ' deleted employee(s) on '; END IF; DBMS_OUTPUT.PUT_LINE('User ' || USER || v_action || TO_CHAR(SYSDATE,'YYYY-MM-DD')); END; CREATE OR REPLACE TRIGGER emp_sal_trig BEFORE DELETE OR INSERT OR UPDATE ON emp FOR EACH ROW DECLARE sal_diff NUMBER; BEGIN IF INSERTING THEN DBMS_OUTPUT.PUT_LINE('Inserting employee ' || :NEW.empno); DBMS_OUTPUT.PUT_LINE('..New salary: ' || :NEW.sal); END IF; IF UPDATING THEN sal_diff := :NEW.sal - :OLD.sal; DBMS_OUTPUT.PUT_LINE('Updating employee ' || :OLD.empno); DBMS_OUTPUT.PUT_LINE('..Old salary: ' || :OLD.sal); DBMS_OUTPUT.PUT_LINE('..New salary: ' || :NEW.sal); DBMS_OUTPUT.PUT_LINE('..Raise : ' || sal_diff); END IF; IF DELETING THEN DBMS_OUTPUT.PUT_LINE('Deleting employee ' || :OLD.empno); DBMS_OUTPUT.PUT_LINE('..Old salary: ' || :OLD.sal); END IF; END; 建立包 CREATE PACKAGE CREATE OR REPLACE PACKAGE emp_admin IS FUNCTION get_dept_name ( p_deptno NUMBER ) RETURN VARCHAR2; FUNCTION update_emp_sal ( p_empno NUMBER, p_raise NUMBER ) RETURN NUMBER; PROCEDURE hire_emp ( p_empno NUMBER, p_ename VARCHAR2, p_job VARCHAR2, p_sal NUMBER, p_hiredate DATE, p_comm NUMBER, p_mgr NUMBER, p_deptno NUMBER ); PROCEDURE fire_emp ( p_empno NUMBER ); END emp_admin; 建立包体 CREATE PACKAGE BODY -- -- Package body for the 'emp_admin' package. -- CREATE OR REPLACE PACKAGE BODY emp_admin IS -- -- Function that queries the 'dept' table based on the department -- number and returns the corresponding department name. -- FUNCTION get_dept_name ( p_deptno IN NUMBER ) RETURN VARCHAR2 IS v_dname VARCHAR2(14); BEGIN SELECT dname INTO v_dname FROM dept WHERE deptno = p_deptno; RETURN v_dname; EXCEPTION WHEN NO_DATA_FOUND THEN DBMS_OUTPUT.PUT_LINE('Invalid department number ' || p_deptno); RETURN ''; END; -- -- Function that updates an employee's salary based on the -- employee number and salary increment/decrement passed -- as IN parameters. Upon successful completion the function -- returns the new updated salary. -- FUNCTION update_emp_sal ( p_empno IN NUMBER, p_raise IN NUMBER ) RETURN NUMBER IS v_sal NUMBER := 0; BEGIN SELECT sal INTO v_sal FROM emp WHERE empno = p_empno; v_sal := v_sal + p_raise; UPDATE emp SET sal = v_sal WHERE empno = p_empno; RETURN v_sal; EXCEPTION WHEN NO_DATA_FOUND THEN DBMS_OUTPUT.PUT_LINE('Employee ' || p_empno || ' not found'); RETURN -1; WHEN OTHERS THEN DBMS_OUTPUT.PUT_LINE('The following is SQLERRM:'); DBMS_OUTPUT.PUT_LINE(SQLERRM); DBMS_OUTPUT.PUT_LINE('The following is SQLCODE:'); DBMS_OUTPUT.PUT_LINE(SQLCODE); RETURN -1; END; -- -- Procedure that inserts a new employee record into the 'emp' table. -- PROCEDURE hire_emp ( p_empno NUMBER, p_ename VARCHAR2, p_job VARCHAR2, p_sal NUMBER, p_hiredate DATE, p_comm NUMBER, p_mgr NUMBER, p_deptno NUMBER ) AS BEGIN INSERT INTO emp(empno, ename, job, sal, hiredate, comm, mgr, deptno) VALUES(p_empno, p_ename, p_job, p_sal, p_hiredate, p_comm, p_mgr, p_deptno); END; -- -- Procedure that deletes an employee record from the 'emp' table based -- on the employee number. -- PROCEDURE fire_emp ( p_empno NUMBER ) AS BEGIN DELETE FROM emp WHERE empno = p_empno; END; END;

详细解答可以参考官方帮助文档 为保证迁移过程中，源数据库业务写入的所有变更数据能够被迁移到目标库，在全量迁移之前，数据传输后台就会开启增量数据拉取模块，拉取并保存迁移过程中，源数据库的业务写入。当全量数据迁移完成后，会启动增量写入模块，开始回放全量迁移过程中产生的增量数据，从而实现源跟目标实例增量数据实时同步。 当迁移进入增量数据迁移阶段后，增量数据迁移是一个动态的过程，除非用户手动停止迁移，否则会一直保持两边数据实时同步，所以建议当增量迁移无延迟时，可以进行源数据库和目标数据库的数据校验，并在目标数据库进行业务测试，当这些验证都通过后，可以停止迁移任务，然后将业务切换到目标数据库上。通过这种迁移方式，可实现在数据迁移过程中，应用停服时间降低到分钟级别。

详细解答可以参考官方帮助文档 该参数可以在如下路径修改：CDN控制台【域名管理】->【配置】->【性能优化】->【过滤参数】开启过滤参数的作用是忽略URL请求中'?'之后的参数，提高CDN缓存的命中率。开启【过滤参数】后，访问URL无需匹配'?'之后的参数，元素就可命中CDN的缓存，提高CDN的命中率。例如：第一次访问http://www.****.com/1.jpg，CDN没有缓存，直接回源访问数据。第二次访问http://www.****.com/1.jpg?test1，由于开启了过滤参数'?'，所以'?'后面的参数无需匹配，即可命中CDN缓存 http://www.****.com/1.jpg。后续访问，不论'?'后面带的是什么参数，均命中缓存http://www.****.com/1.jpg。 关闭【过滤参数】后，访问URL需精确匹配'?'之后的参数，提高请求的精确性。例如：第一次访问http://www.****.com/1.jpg，CDN没有缓存，直接回源访问数据。第二次访问http://www.****.com/1.jpg?test1，由于关闭了过滤参数'?'，所以'?'后面的参数需精确匹配，即无法响应CDN缓存内容http://www.****.com/1.jpg，需要重新回源拉取http://www.****.com/1.jpg?test1。后续访问，'?'后面的参数要与CDN缓存精确匹配才能响应CDN缓存内容。只有精确匹配'?'后面的参数，才能响应CDN缓存内容。如还有其它问题，请联系售后技术支持。