Oracle-expdp方式升级19c问题合集

前言:

最近在帮客户进行Oracle11g到19c版本的升级，使用expdp导用户的方式进行迁移，在升级过程中遇到了些错误问题，把当时的问题分析过程记录了下来，分享给大家。

问题一:导入出现报错ORA-39346:


ORA-39346: data loss in character set conversion for object COMMENT:"xxx_"
ORA-39346: data loss in character set conversion for object COMMENT:"xxx_"
ORA-39346: data loss in character set conversion for object COMMENT:"xxxFT"
ORA-39346: data loss in character set conversion for object COMMENT:"xxxFT"
ORA-39346: data loss in character set conversion for object COMMENT:"xxxFT"
ORA-39346: data loss in character set conversion for object COMMENT:"xxxFT"
ORA-39346: data loss in character set conversion for object COMMENT:"xxx"
ORA-39346: data loss in character set conversion for object COMMENT:"xxx"

问题分析:

该报错说明在导入的过程字符集转化发生数据丢失的情况

出现该问题是第一要做的就是确认源端和目标端的字符集(NLS_CHARACTERSET),国家字符集(NLS_NCHAR_CHARACTERSET)),操作系统NLS_LANG设置是否一致


 1  select property_name,property_value
  2  from database_properties
  3* where property_name like '%CHARA%'
PROPERTY_NAME           PROPERTY_VALUE
------------------------------ ----------------------------------------
NLS_NUMERIC_CHARACTERS         .,
NLS_NCHAR_CHARACTERSET         UTF8
NLS_CHARACTERSET         AL32UTF8

确认目标库和源端的字符集设置都一致排除字符集导致的问题之后，进一步查看报错对象的DDL元数据，发现源库存在中文乱码的情况，这从而导致在19c导入的创建对象的过程中出现ORA-39346: data loss in character set conversion的错误，实际对象创建成功，但乱码会出现字符转化错误

问题解决:

出现乱码丢失的都为注释，对应用的实际使用没影响，后续只能让应用自己慢慢去修改，不影响11g升级19c

问题二:导入之后dba_jobs的log_user显示为SYS

在导入job之后，检查发现dba_jobs的log_user字段为sys，而不是应用用户，priv_user,schema_user 这两个字段显示正常

问题分析：

一开始以为是使用sys导入的原因，尝试通过dbms_ijob手动创建，log_user还是显示为sys，后面通过Oracle 官方查看案例，才确认命中了bug 32249704,在19c通过impdp导入，log_user会发生改变

问题解决:

1 安装oneoff补丁32249704(online patch)修复了该问题

2 也可以使用job的创建用户进行导出导入，规避该问题

问题三:导入报错ORA-39083,ORA-01858

导入发生物化视图刷新组创建失败的报错


Processing object type SCHEMA_EXPORT/REFRESH_GROUP
ORA-39083: Object type REFRESH_GROUP:"XXXX"."VW_XXXXX" failed to create with error:
ORA-01858: a non-numeric character was found where a numeric was expected
Failing sql is:
 BEGIN dbms_refresh.make
 (
 '"xxx"."xxx"',
 list=>null,
 next_date=>'00-JAN-01',
 interval=>'to_date( concat( to_char( sysdate+1,''dd-mm-yyyy''),'' 01:21:30''),''dd-mm-yyyy hh24:mi:ss'') ',
 implicit_destroy=>TRUE,
 lax=>FALSE,
 job=>52,
 rollback_seg=>NULL,
 push_deferred_rpc=>TRUE,
 refresh_after_errors=>FALSE,
 purge_option=>1,
 parallelism=>0,
 heap_size=>0
 );
 dbms_refresh.add(name=>'"xxx"."xxx"',list=>'"xxx"."xxx"',siteid=>0,export_db=>'xxx'); 
END;
/

问题分析：

dbms_refresh.make, dbms_refresh.add是用于编译创建物化视图刷新组，刷新组调用的是job 52，执行出现报错的原因为需要数字的参数出现一个非数字的字符串，执行SQL的错误的地方在next_date=>'00-JAN-01'，因为next_date的输入参数类型为date，但输入的字符串'00-JAN-02'没法隐式转化为日期，导致出现报错

对于导入的执行SQL为啥会出现'00-JAN-02'，我们查看job 52，可以发现job52在源库的状态为禁用(broken=y)，导致next_date为4000-01-01 00:00:00，所以在导入的sql执行就变成next_date=>'00-JAN-01'

问题解决:

修改执行的sql，将next_date修改为日期类型to_date('4000-01-01 00:00:00','yyyy-mm-dd hh24:mi:ss'),在手动执行即可


BEGIN dbms_refresh.make
 (
 '"xxx"."xxx"',
 list=>null,
 next_date=>to_date('4000-01-01 00:00:00','yyyy-mm-dd hh24:mi:ss'),
 interval=>'to_date( concat( to_char( sysdate+1,''dd-mm-yyyy''),'' 01:21:30''),''dd-mm-yyyy hh24:mi:ss'') ',
 implicit_destroy=>TRUE,
 lax=>FALSE,
 job=>52,
 rollback_seg=>NULL,
 push_deferred_rpc=>TRUE,
 refresh_after_errors=>FALSE,
 purge_option=>1,
 parallelism=>0,
 heap_size=>0
 );
 dbms_refresh.add(name=>'"xxx"."xxx"',list=>'"xxx"."xxx"',siteid=>0,export_db=>'xxx'); 
END;
/

问题四:查询DBA_REFRESH字段broken出现“?”


 1* select ROWNER,RNAME,REFGROUP,JOB,BROKEN,job  from DBA_REFRESH
ROWNER                         RNAME                                                                                                                              REFGROUP        JOB B        JOB
------------------------------ -------------------------------------------------------------------------------------------------------------------------------- ---------- ---------- - ----------
xxx                         xxx_MAIN_TAGS                                                                                                                    12            ?
xxx                         xxx_CATEGORY_NAMES                                                                                                               10            ?
xxx                         xxx_READ_TIMES                                                                                                                         16            ?
xxx                         xxx_ORG_DEPT_NAMES                                                                                                                     15            ?
xxx                         xxx_READER_USERS                                                                                                                 13            ?
xxx                         xxx_ATT_DOWN_USERS                                                                                                                9            ?
xxx                         xxx_COMMENT_TIMES                                                                                                                11            ?
xxx                         xxx_USER_HAS                                                                                                                     17            ?
xxx                         xxx_USER_NO                                                                                                                      14            ?

问题分析：

查看DBA_REFERSH视图的定义SQL，可以发现broken等于?的条件为decode(bitand(j.flag,1),1,'Y',0,'N','?') AS BROKEN


SELECT ROWNER,
          RNAME,
          REFGROUP,
          IMPLICIT_DESTROY,
          PUSH_DEFERRED_RPC,
          REFRESH_AFTER_ERRORS,
          ROLLBACK_SEG,
          JOB,
          NEXT_DATE,
          INTERVAL,
          BROKEN,
          PURGE_OPTION,
          PARALLELISM,
          HEAP_SIZE,
          JOB_NAME
  FROM (
      SELECT r.owner AS ROWNER, r.name AS RNAME, r.REFGROUP AS REFGROUP,
          decode(bitand(r.flag,1),1,'Y',0,'N','?') AS IMPLICIT_DESTROY,
          decode(bitand(r.flag,2),2,'Y',0,'N','?') AS PUSH_DEFERRED_RPC,
          decode(bitand(r.flag,4),4,'Y',0,'N','?') AS REFRESH_AFTER_ERRORS,
          r.rollback_seg AS ROLLBACK_SEG,
          j.JOB AS JOB, j.NEXT_DATE AS NEXT_DATE, j.INTERVAL# AS INTERVAL,
          decode(bitand(j.flag,1),1,'Y',0,'N','?') AS BROKEN,
          r.purge_opt# AS PURGE_OPTION,
          r.parallelism# AS PARALLELISM,
          r.heap_size# AS HEAP_SIZE,
          r.job_name AS JOB_NAME
      FROM  rgroup$ r, job$ j
      WHERE r.instsite = 0
      AND   r.job_name IS NULL AND r.job = j.job(+)
      UNION ALL
      SELECT r.owner AS ROWNER, r.name AS RNAME, r.REFGROUP AS REFGROUP,
          decode(bitand(r.flag,1),1,'Y',0,'N','?') AS IMPLICIT_DESTROY,
          decode(bitand(r.flag,2),2,'Y',0,'N','?') AS PUSH_DEFERRED_RPC,
          decode(bitand(r.flag,4),4,'Y',0,'N','?') AS REFRESH_AFTER_ERRORS,
          r.rollback_seg AS ROLLBACK_SEG,
          r.JOB AS JOB,
          CAST(s.next_run_date AS DATE) AS NEXT_DATE,
          substr(s.repeat_interval,1,200) AS INTERVAL,
          decode(s.enabled,'FALSE','Y','TRUE','N','?') AS BROKEN,
          r.purge_opt#  AS  PURGE_OPTION,
          r.parallelism# AS PARALLELISM,
          r.heap_size#   AS HEAP_SIZE,
          r.job_name     AS JOB_NAME
      FROM  rgroup$ r, dba_scheduler_jobs s
      where r.instsite = 0
        AND r.owner = s.owner(+)
        and r.job_name IS NOT NULL AND r.job_name = s.job_name(+)
  )

j.flag字段来着于基表job$,但查看基表job$的数据，可以发现job$没有数据，由于job$没有数据，导致于rgroup$左连接之后，字段j.flag返回null，所以显示为?


SQL> select count(*) from job$;
  COUNT(*)
----------
         0

问题解决:

从官方上看，没有关于Oracle19c基表job$没有数据的说明，也没有相关的公开bug说明，目前的规避方法只能通过rgroup$与dba_jobs进行关联查询规避问题

问题五:导入出现ORA-02298: cannot validate (XXXX.FK82xxx0705) - parent keys not found


Failing sql is:
ALTER TABLE "xxx"."xxx" ADD CONSTRAINT "FKxxx" FOREIGN KEY ("FD_DOC_ID") REFERENCES "xxx"."xxxx" ("xxxx") ENABLE
ORA-39083: Object type REF_CONSTRAINT:"xxx"."xxxx" failed to create with error:
ORA-02298: cannot validate (xxx.xxxx) - parent keys not found
Failing sql is:
ALTER TABLE "xxx"."xxxx" ADD CONSTRAINT "xxxx" FOREIGN KEY ("xxxx") REFERENCES "xxx"."SYS_NOTIFY_TODO" ("xxxx") ENABLE
ORA-39083: Object type REF_CONSTRAINT:"xxx"."xxxx" failed to create with error:
ORA-02298: cannot validate (xxx.xxxx) - parent keys not found

问题分析：

出现外键约束检查失败之后，首先需要检查的是父表以及子表的约束状态是否正常


select constraint_name,status
from dba_constraints
  
select b.owner, b.table_name, c.column_name FK_column, b.constraint_name, b.delete_rule
from   dba_constraints a, dba_constraints b, dba_cons_columns c
where  a.owner = b.r_owner and
       b.owner = c.owner and
       b.table_name = c.table_name and
       b.constraint_name = c.constraint_name and
       a.constraint_name = b.r_constraint_name and
       b.constraint_type = 'R' and
       a.owner = '' and
       a.table_name in ('') and
       a.constraint_type = 'P';

如果检查约束状态正常，则很有可能是导出父表以及子表的数据不一致导致，即子表的外键出现父表不存在的数据，导致在添加外键约束的时候，检查不通过

问题解决:

expdp导出的时候，添加flashback_scn确保导出数据时间点一致


---查看数据库的当前scn
select to_char(current_scn) from v$database;
---expdp 添加
FLASHBACK_SCN=

问题六:导入对象权限出现丢失

在导入完成之后，比较对象权限两边的数量，出现目标端权限少于源端权限的情况

问题分析：

通过对两边对象权限进行比对，发现缺失的授权对象都是sys对象

通过Oracle官方查看，用户不导出SYS对象的授权是expdp预期的行为，不是bug或是错误,（PS:这里只能说明自己的方案还不够谨慎!!!)

问题解决:

在源库手动生成批量授权的语句，在导目标库进行导入


1. As the privileges on SYS owned objects are not exported, you need to have another method in place which re-creates these privileges. E.g. a script that is called during export time and that will recreate these grants (or you store these lines in a table).
Example:
connect / as sysdba
spool grants_tc.out
col GRANTS for a80
-- xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
-- Add below the users and/or roles as appropriate for GRANTEE
-- xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
select 'grant ' || privilege || ' on ' ||'"'||table_name ||'"'||
      ' to ' || grantee || ';' "GRANTS"
 from dba_tab_privs
where owner = 'SYS' and privilege not in ('READ', 'WRITE')
  and grantee in ('TC')
order by 1;
spool off
-- example of query output:
GRANTS
--------------------------------------------------------------------------------
grant EXECUTE on DBMS_CRYPTO to TC;
2. Before the start of the Import Data pump job, you can pre-create the schema, e.g.:
$ impdp system/<PASSWORD> directory=<DIRECTORY NAME> dumpfile=<FILENAME>.dmp logfile=<LOG FILE NAME>..log schemas=tc include=user
3. Then pre-create the grants on SYS owned objects, by running your script (see step 1 above).
4. Followed by the import of the rest of the objects, e.g.:
$ impdp system/<PASSWORD> directory=<DIRECTORY NAME> dumpfile=<FILE NAME>.dmp logfile=<LOG FILE NAME>.log schemas=tc exclude=user

总结:

以上为在expdp方式11g升级19c遇到的错误合集，希望对大家有所帮助！

相关阅读:
Java核心编程(18)
SpringBoot自动装配
 C语言力扣第32题之最长有效括号。用栈实现
 【大数据】Spark使用大全:下载安装、RDD操作、JAVA编程、SQL
数据结构与算法-第五章树与二叉树
 线上频繁fullgc问题-SpringActuator的坑
 人大金仓数据库创建与还原--九五小庞
 Netty架构详解
 Flutter学习笔记 --事件处理
 vite创建Vue3项目:router+pinia+element-plus or antd + sass + ts
原文地址：https://blog.csdn.net/sinat_36757755/article/details/126862152