分类目录归档:Oracle 开发

DBMS_SESSION.set_context提示ORA-01031问题解决

最近给客户把oracle数据库从11.2.0.3 aix平台迁移到19.23 linux平台,使用impdp+network_link 按照用户的方式处理,结果发现有一个程序运行异常
ORA-01031


ORA-01031: insufficient privileges通过程序跟踪确认是在调用以下部分异常

 DBMS_SESSION.set_context (
         'back_exec',
         'back_exec_log_no',
         v_back_exec_log_no
……

通过跟踪执行用户权限,确认EXECUTE ON SYS.DBMS_SESSION已经授权.做一个简单测试重现给问题:

SQL> show user;
USER 为 "SYS"

SQL> exec DBMS_SESSION.SET_CONTEXT('test_ctx', 'a', '1');
BEGIN DBMS_SESSION.SET_CONTEXT('test_ctx', 'a', '1'); END;

*
第 1 行出现错误:
ORA-01031: 权限不足
ORA-06512: 在 "SYS.DBMS_SESSION", line 114
ORA-06512: 在 line 1

SQL> GRANT EXECUTE ON SYS.DBMS_SESSION TO sys;

授权成功。

SQL> exec DBMS_SESSION.SET_CONTEXT('test_ctx', 'a', '1');
BEGIN DBMS_SESSION.SET_CONTEXT('test_ctx', 'a', '1'); END;

*
第 1 行出现错误:
ORA-01031: 权限不足
ORA-06512: 在 "SYS.DBMS_SESSION", line 114
ORA-06512: 在 line 1

基于这种情况,肯定不是权限问题,查询官方DBMS_SESSION.set_context部分描述
dbms_session.set_context


确认namespace:The namespace of the application context to be set, limited to 128 bytes. Exceeding the maximum permissible length will result in an error during the execution of the procedure.

SQL> create context test_ctx using sys.DBMS_SESSION;

上下文已创建。

SQL> exec DBMS_SESSION.SET_CONTEXT('test_ctx', 'a', '1');

PL/SQL 过程已成功完成。

官方有相关的执行例子:Example: Creating a Global Application Context that Uses a Client Session ID

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触发器找出密码错误应用

经常会遇到修改oracle业务用户密码之后,由于部分应用密码没有被正确修改(忘记修改,或者修改错误了),导致数据库被hang或者用户被锁的情况,对于这样的情况,通过一个logon触发器可以快速找到

create or replace trigger logon_denied_to_alert
after servererror on database
declare
 message   varchar2(120);
 IP        varchar2(15);
 v_os_user varchar2(80);
 v_module  varchar2(50);
 v_action  varchar2(50);
 v_pid     varchar2(10);
 v_sid     number;
 v_username  varchar2(50);
 v_suser      varchar2(50);
begin
 IF (ora_is_servererror(1017)) THEN
   if sys_context('userenv', 'network_protocol') = 'tcp' then
     IP := sys_context('userenv', 'ip_address');
   else
     select distinct sid into v_sid from sys.v_$mystat;
     SELECT p.SPID
       into v_pid
       FROM V$PROCESS p, V$SESSION v
      WHERE p.ADDR = v.PADDR
        AND v.sid = v_sid;
   end if;
   v_os_user := sys_context('userenv', 'os_user');
   v_username := sys_context('userenv', 'CURRENT_USER');
   v_suser := SYS_CONTEXT('USERENV','SESSION_USER');
   dbms_application_info.READ_MODULE(v_module, v_action);
   message := to_char(sysdate, 'Dy Mon dd HH24:MI:SS YYYY') ||
              ' logon denied from '||v_username||' '||v_suser||' '|| nvl(IP, v_pid) || ' ' || v_os_user ||
              ' with ' || v_module || ' ' || v_action;
   sys.dbms_system.ksdwrt(2, message);
 end if;
end;
/

测试

SQL> create user test identified by oracle;

User created.

SQL> grant dba to test;

Grant succeeded.

直接本地登录

SQL> conn test/test
ERROR:
ORA-01017: invalid username/password; logon denied


Warning: You are no longer connected to ORACLE.

---alert日志记录
Wed Nov 01 23:15:04 2023 logon denied from SYS  12886 oracle with sqlplus@iZbp1hx0enix3hix1kvyrxZ (TNS V1-V3) 

通过tns登录

SQL> conn  test/oracl1@172.27.54.81:1522/orcl
ERROR:
ORA-01017: invalid username/password; logon denied


Warning: You are no longer connected to ORACLE.

---alert日志报错
Wed Nov 01 23:31:51 2023 logon denied from SYS  172.27.54.81 oracle with sqlplus@iZbp1hx0enix3hix1kvyrxZ (TNS V1-V3) 
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plsql 插入blob

plsql 插入blob

SQL> create bigfile tablespace t_xifenfei datafile 'e:/oradata/orcl/t_blob.dbf' size 128M autoextend on;

表空间已创建。


SQL> create table u0425.t_blob(a int, b varchar(10), c blob) tablespace t_xifenfei ;

表已创建。


SQL> create or replace directory expdp_dir as 'e:/';

目录已创建。


SQL> declare
  2  b_file bfile;
  3  b_lob blob;
  4  begin
  5  insert into u0425.t_blob(a,b,c) values(1,'xifenfei', empty_blob()) return c into b_lob;
  6  b_file:=bfilename('EXPDP_DIR','0430.DMP');
  7  dbms_lob.open(b_file,dbms_lob.file_readonly);
  8  dbms_lob.loadfromfile(b_lob,b_file,dbms_lob.getlength(b_file));
  9  dbms_lob.close(b_file);
 10  commit;
 11  end;
 12  /

PL/SQL 过程已成功完成。

SQL> select * from u0425.t_blob where rownum<2;

         A B
---------- ----------
C
--------------------------------------------------------------------------------
         1 xifenfei
0301914E3B98006780BC00019FC70146A1A3633DBC4B089DCF3DFCD951D559000000010000100003
6907E6041E0D3037000000020200000077D10000000000FA1A880022535953222E225359535F4558


SQL> select a,b,dbms_lob.getlength(c) from u0425.t_blob where rownum<2;

         A B          DBMS_LOB.GETLENGTH(C)
---------- ---------- ---------------------
         1 xifenfei               142024704

插入的blob字段和实际文件大小,内容一致,插入是成功的
20220502164359
20220502164727


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