Cause:
$ oerr ora 30372
30372, 00000, "fine grain access policy conflicts with materialized view"
// *Cause: A fine grain access control procedure has applied a non-null policy
//          to the query for the materialized view.
//
// *Action: In order for the materialized view to work correctly, any fine
//          grain access control procedure in effect for the query must
//          return a null policy when the materialized view is being
//          created or refreshed. This may be done by ensuring that the
//          usernames for the creator, owner, and invoker of refresh
//          procedures for the materialized view all receive a null policy
//          by the user-written fine grain access control procedures.

Solution:
Oracle 标准解决方法:
A. Do not use Materialized views - use standard views to extract the information.

or
B. use a separate schema , for example:
1. Create a new schema.
2. Grant select access to the Portal views for the new schema (not supported)
3. Grant EXEMPT ACCESS POLICY to the new schema
4. Build your materialized view in the new schema

不过在网上搜到了一个变动更小的解决方法:
Add this:

IF SYS.DBMS_MVIEW.I_AM_A_REFRESH THEN
RETURN NULL;
END IF;

at the very beginning of the policy function before other IF blocks.
This should do the trick.

有点搞笑的是,这个procedure的名称,I am a refresh,起名蛮幽默的,呵呵

oracle 10g em登录界面乱码,数据库版本10.2.0.4

Cause:

应该是emctl配置管理器时,配置了安全加密选项.

Solution:

网页访问时,使用https来代替http,问题解决.

蛮简单的问题及解决,看来还是文档看的还是不够,简单记录下备用.

• This note contains links to documentation for the server parameter QUERY_REWRITE_ENABLED along with any additional "Support / Historical Notes" and "Known Bugs" (if any) which may affect or be impacted by the value of this parameter.

QUERY_REWRITE_ENABLED Documentation

• 11.1 Online Reference for QUERY_REWRITE_ENABLED
• 10.2 Online Reference for QUERY_REWRITE_ENABLED
• 10.1 Online Reference for QUERY_REWRITE_ENABLED
• 9.2 Online Reference for QUERY_REWRITE_ENABLED
• 9.0 Online Reference for QUERY_REWRITE_ENABLED

Summary Version Information

Version	Parameter		Type	Modifiable
11.1.0.7	query_rewrite_enabled		STRING	ALTER SESSION ALTER SYSTEM (IMMEDIATE)
11.1.0.6	query_rewrite_enabled		STRING	ALTER SESSION ALTER SYSTEM (IMMEDIATE)
10.2.0.4	query_rewrite_enabled		STRING	ALTER SESSION ALTER SYSTEM (IMMEDIATE)
10.2.0.3	query_rewrite_enabled		STRING	ALTER SESSION ALTER SYSTEM (IMMEDIATE)
10.1.0.5	query_rewrite_enabled		STRING	ALTER SESSION ALTER SYSTEM (IMMEDIATE)
10.1.0.4	query_rewrite_enabled		STRING	ALTER SESSION ALTER SYSTEM (IMMEDIATE)
9.2.0.8	query_rewrite_enabled		STRING	ALTER SESSION ALTER SYSTEM (IMMEDIATE)
9.0.1.4	query_rewrite_enabled		BOOLEAN	ALTER SESSION ALTER SYSTEM (IMMEDIATE)
8.1.7.4	query_rewrite_enabled		BOOLEAN	ALTER SESSION ALTER SYSTEM (IMMEDIATE)

Support and Historical Notes for "QUERY_REWRITE_ENABLED"

  This parameter can be altered at session level. It needs to be
  set to TRUE to enable the use of functional indexes (See Note 69492.1)
  and for stored outlines.

Articles:
  Overview of Init.Ora Parameter Reference notes    Note 68462.1

Symptoms:

Solutions:

Others:

driving_site_hint::=

where table is the name or alias for the table at which site the execution should take place.

For example:

SELECT /*+DRIVING_SITE(departments)*/ * 
FROM employees, departments@rsite 
WHERE employees.department_id = departments.department_id;

This hint is useful if you are using distributed query optimization.

在分布式应用中很有用，今天碰到dblink远程访问性能问题，使用这个hint,问题解决。记录一下，以备后用。

SHUTDOWN IMMEDIATE;
– make sure there is a database backup you can rely on, or create one
STARTUP MOUNT;
ALTER SYSTEM ENABLE RESTRICTED SESSION;
ALTER SYSTEM SET JOB_QUEUE_PROCESSES=0;
ALTER SYSTEM SET AQ_TM_PROCESSES=0;
ALTER DATABASE OPEN;
ALTER DATABASE CHARACTER SET ZHS32GB18030;
SHUTDOWN;

一般现实环境中,严格意义上的子集到超集变更是很少的.像很多人误认为的ZHS16GBK 是ZHS16CGB231280的严格超集（虽然后者的汉字在前者中都存在，但是同样的编码在不同两个
字符集中可能表达不同的汉字),是无法通过上述方式正常变更的.

在这种情况下,Oracle提供的标准方式是使用新字符集重建数据库,然后导出,导入.但这种方式较烦琐.还有另外一种非Oracle支持的方式,操作如下:

一, 使用CSSCAN扫描
1, 安装Csscan Csmig Schema
cd $ORACLE_HOME/rdbms/admin
set oracle_sid=<your SID>
sqlplus /nolog
SQL>conn / as sysdba
SQL>set TERMOUT ON
SQL>set ECHO ON
SQL>spool csminst.log
SQL>@?/rdbms/admin/csminst.sql
2, 使用CSSCAN程序扫描数据库
set oracle_sid=<your SID>
set PATH=<oracle home bin>
csscan system full=y tochar=ZHS32GB18030 capture=y array=1000000 process=2

查看日志,转换的字符集是否有严重损坏,或者能否有其它方式转换后进行变更.如果确认没问题的话,可以进行下一步.注意由于不是Oracle支持的方式,请动作前备份系统.
可参考metalink doc:
Note 745809.1 Installing and configuring CSSCAN in 10g and 11g
Note 458122.1 Installing and configuring CSSCAN in 8i and 9i

二, 数据库字符集变更
SHUTDOWN IMMEDIATE;
– make sure there is a database backup you can rely on, or create one
STARTUP MOUNT;
ALTER SYSTEM ENABLE RESTRICTED SESSION;
ALTER SYSTEM SET JOB_QUEUE_PROCESSES=0;
ALTER SYSTEM SET AQ_TM_PROCESSES=0;
ALTER DATABASE OPEN;
ALTER DATABASE CHARACTER SET INTERNAL_USE ZHS32GB18030;
SHUTDOWN;

此操作与正常操作多了一个INTERNAL_USE,经分析,加此参数后,数据库在变更时不会判断子集和超集的关系,因此具有一定的风险,csscan和系统全备是必不可少的.

8.1.6 Subset/Superset Pairs
===========================

A. Current Char set             B. New Char set (Strict Superset of A.)
-------------------             ---------------------------------------
US7ASCII                        WE8DEC
US7ASCII                        US8PC437
US7ASCII                        WE8PC850
US7ASCII                        IN8ISCII
US7ASCII                        WE8PC858
US7ASCII                        WE8ISO8859P1
US7ASCII                        EE8ISO8859P2
US7ASCII                        SE8ISO8859P3
US7ASCII                        NEE8ISO8859P4
US7ASCII                        CL8ISO8859P5
US7ASCII                        AR8ISO8859P6
US7ASCII                        EL8ISO8859P7
US7ASCII                        IW8ISO8859P8
US7ASCII                        WE8ISO8859P9
US7ASCII                        NE8ISO8859P10
US7ASCII                        TH8TISASCII
US7ASCII                        BN8BSCII
US7ASCII                        VN8VN3
US7ASCII                        VN8MSWIN1258
US7ASCII                        WE8ISO8859P15
US7ASCII                        WE8NEXTSTEP
US7ASCII                        AR8ASMO708PLUS
US7ASCII                        EL8DEC
US7ASCII                        TR8DEC
US7ASCII                        LA8PASSPORT
US7ASCII                        BG8PC437S
US7ASCII                        EE8PC852
US7ASCII                        RU8PC866
US7ASCII                        RU8BESTA
US7ASCII                        IW8PC1507
US7ASCII                        RU8PC855
US7ASCII                        TR8PC857
US7ASCII                        CL8MACCYRILLICS
US7ASCII                        WE8PC860
US7ASCII                        IS8PC861
US7ASCII                        EE8MACCES
US7ASCII                        EE8MACCROATIANS
US7ASCII                        TR8MACTURKISHS
US7ASCII                        EL8MACGREEKS
US7ASCII                        IW8MACHEBREWS
US7ASCII                        EE8MSWIN1250
US7ASCII                        CL8MSWIN1251
US7ASCII                        ET8MSWIN923
US7ASCII                        BG8MSWIN
US7ASCII                        EL8MSWIN1253
US7ASCII                        IW8MSWIN1255
US7ASCII                        LT8MSWIN921
US7ASCII                        TR8MSWIN1254
US7ASCII                        WE8MSWIN1252
US7ASCII                        BLT8MSWIN1257
US7ASCII                        N8PC865
US7ASCII                        BLT8CP921
US7ASCII                        LV8PC1117
US7ASCII                        LV8PC8LR
US7ASCII                        LV8RST104090
US7ASCII                        CL8KOI8R
US7ASCII                        BLT8PC775
US7ASCII                        WE8DG
US7ASCII                        WE8NCR4970
US7ASCII                        WE8ROMAN8
US7ASCII                        WE8MACROMAN8S
US7ASCII                        TH8MACTHAIS
US7ASCII                        HU8CWI2
US7ASCII                        EL8PC437S
US7ASCII                        LT8PC772
US7ASCII                        LT8PC774
US7ASCII                        EL8PC869
US7ASCII                        EL8PC851
US7ASCII                        CDN8PC863
US7ASCII                        HU8ABMOD
US7ASCII                        AR8ASMO8X
US7ASCII                        AR8NAFITHA711T
US7ASCII                        AR8SAKHR707T
US7ASCII                        AR8MUSSAD768T
US7ASCII                        AR8ADOS710T
US7ASCII                        AR8ADOS720T
US7ASCII                        AR8APTEC715T
US7ASCII                        AR8NAFITHA721T
US7ASCII                        AR8HPARABIC8T
US7ASCII                        AR8NAFITHA711
US7ASCII                        AR8SAKHR707
US7ASCII                        AR8MUSSAD768
US7ASCII                        AR8ADOS710
US7ASCII                        AR8ADOS720
US7ASCII                        AR8APTEC715
US7ASCII                        AR8MSAWIN
US7ASCII                        AR8NAFITHA721
US7ASCII                        AR8SAKHR706
US7ASCII                        AR8ARABICMACS
US7ASCII                        LA8ISO6937
US7ASCII                        JA16VMS
US7ASCII                        JA16EUC
US7ASCII                        JA16SJIS
US7ASCII                        KO16KSC5601
US7ASCII                        KO16KSCCS
US7ASCII                        KO16MSWIN949
US7ASCII                        ZHS16CGB231280
US7ASCII                        ZHS16GBK
US7ASCII                        ZHT32EUC
US7ASCII                        ZHT32SOPS
US7ASCII                        ZHT16DBT
US7ASCII                        ZHT32TRIS
US7ASCII                        ZHT16BIG5
US7ASCII                        ZHT16CCDC
US7ASCII                        ZHT16MSWIN950
US7ASCII                        AL24UTFFSS
US7ASCII                        UTF8
US7ASCII                        JA16TSTSET2
US7ASCII                        JA16TSTSET

8.1.7 Additions
===============

US7ASCII                        ZHT16HKSCS 
US7ASCII                        KO16TSTSET 
WE8DEC                          TR8DEC 
WE8DEC                          WE8NCR4970 
WE8PC850                        WE8PC858 
D7DEC                           D7SIEMENS9780X 
I7DEC                           I7SIEMENS9780X 
WE8ISO8859P1                    WE8MSWIN1252 
AR8ISO8859P6                    AR8ASMO708PLUS 
AR8ISO8859P6                    AR8ASMO8X 
IW8EBCDIC424                    IW8EBCDIC1086 
IW8EBCDIC1086                   IW8EBCDIC424 
LV8PC8LR                        LV8RST104090 
DK7SIEMENS9780X                 N7SIEMENS9780X 
N7SIEMENS9780X                  DK7SIEMENS9780X 
I7SIEMENS9780X                  I7DEC 
D7SIEMENS9780X                  D7DEC 
WE8NCR4970                      WE8DEC 
WE8NCR4970                      TR8DEC 
AR8SAKHR707T                    AR8SAKHR707 
AR8MUSSAD768T                   AR8MUSSAD768 
AR8ADOS720T                     AR8ADOS720 
AR8NAFITHA711                   AR8NAFITHA711T 
AR8SAKHR707                     AR8SAKHR707T 
AR8MUSSAD768                    AR8MUSSAD768T 
AR8ADOS710                      AR8ADOS710T 
AR8ADOS720                      AR8ADOS720T 
AR8APTEC715                     AR8APTEC715T 
AR8NAFITHA721                   AR8NAFITHA721T 
AR8ARABICMAC                    AR8ARABICMACT 
AR8ARABICMACT                   AR8ARABICMAC 
KO16KSC5601                     KO16MSWIN949 
WE16DECTST2                     WE16DECTST 
WE16DECTST                      WE16DECTST2 

  
9.0.1 Additions
===============

US7ASCII                        BLT8ISO8859P13 
US7ASCII                        CEL8ISO8859P14 
US7ASCII                        CL8ISOIR111 
US7ASCII                        CL8KOI8U 
US7ASCII                        AL32UTF8 
BLT8CP921                       BLT8ISO8859P13 
US7ASCII                        AR8MSWIN1256 
UTF8                            AL32UTF8 (added in patchset 9.0.1.2)

Character Set Subset/Superset Pairs Obsolete from 9.0.1
=======================================================

US7ASCII                        AR8MSAWIN
AR8ARABICMAC                    AR8ARABICMACT

9.2.0 Additions
===============

US7ASCII                        JA16EUCTILDE
US7ASCII                        JA16SJISTILDE
US7ASCII                        ZHS32GB18030
US7ASCII                        ZHT32EUCTST
WE8ISO8859P9                    TR8MSWIN1254
LT8MSWIN921                     BLT8ISO8859P13
LT8MSWIN921                     BLT8CP921
BLT8CP921                       LT8MSWIN921
AR8ARABICMAC                    AR8ARABICMACT
ZHT32EUC                        ZHT32EUCTST
UTF8                            AL32UTF8

Character Set Subset/Superset Pairs Obsolete from 9.2.0
=======================================================

LV8PC8LR                        LV8RST104090