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- .wstop扩展名勒索数据库恢复
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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: 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
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
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)
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
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