I want to change database character set from AL32UTF8 to WE8ISO8859P1.
what are the steps I need to follow without creating any new database with the character set as WE8ISO8859P1.
Currently my oracle database character set is we8mswin1252 and it is only containing English data as well as spatial data (which is in English of course). I would like to change the Database character set so it could accept Arabic characters.
I have checked the below command on a test DB and it worked fine, but I want to know if it's recommended as a best practice when changing the character set to accept arabic and this won't corrupt my old entered Data ?
SHUTDOWN IMMEDIATE
STARTUP RESTRICT
ALTER DATABASE CHARACTER SET INTERNAL_USE AR8MSWIN1256
SHUTDOWN IMMEDIATE
STARTUP
I want to change space allocation for character columns in my database, So it will store them as 'CHAR' and not 'BYTE'.my character set is
SQL> SELECT VALUE FROM V$NLS_PARAMETERS WHERE PARAMETER='NLS_CHARACTERSET';
VALUE
----------------------------------------------------------------
AL32UTF8
SQL> alter system set NLS_LENGTH_SEMANTICS='CHAR' scope=both;
System altered.I bounced the instance just to make sure
System altered.
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
Connected to an idle instance.
SQL>
SQL>
SQL> startup
ORACLE instance started.
[code].....
And then I want to see that when I create a table with some varchar2 column,The space for it will be allocated by chars, and not by bytes! However, when I run a check of create table, this is what I get:
SQL> drop table check_char;
Table dropped.
SQL> create table check_char (some_name varchar2(10));
Table created.
SQL> select a.char_used
2 from all_tab_columns a
3 where table_name='CHECK_CHAR'
4 and a.owner='SYS';
C
-
B
SQL>
What is the reason for space allocation to remain in BYTES and not CHAR, or what else I can check?
what's your method,when you want to change the character set ?
View 3 Replies View RelatedHow to change Character set for oracle 8i database. Is there anyway to change the Character set without affecting the current database.
View 11 Replies View RelatedEarlie we used oracle 10g with WE8MSWIN1252 character set(single-byte character) that time the below PL/SQL block was running fine.That is we are passing 56 length character to SYS.DBMS_OBFUSCATION_TOOLKIT.DES3DECRYPT function .Now we migrated to 11g with al32utf8 charecter set.Now if we are using 56 length variables to pass the value then we are getting ORA-06502: PL/SQL: numeric or value error: character string buffer too small error.So i have changed the variable length to 86(Minimum 86 required)
But now i am getting different error
Error report:
ORA-28232: invalid input length for obfuscation toolkit
ORA-06512: at "SYS.DBMS_OBFUSCATION_TOOLKIT_FFI", line 84
ORA-06512: at "SYS.DBMS_OBFUSCATION_TOOLKIT", line 255
ORA-06512: at line 9
+28232. 0000 - "invalid input length for obfuscation toolkit"+
[code]....
Source Database: AMERICAN_AMERICA.US7ASCII
Target Database: AMERICAN_AMERICA.AL32UTF8
From the source database, the chinese characters are stored in some schema table. From the csscan result, there are convertiable, truncate, data lossy character. So, I have tried to use exp/imp for the conversion. However, all chinese characters are invalided and cannot be read anymore. How can I convert them from US7ASCCI to UTF8 database?
Also, I have tried build up another database with AMERICAN_AMERICA.ZHT16MSWIN950. The exp/imp is used for conversion again. The chinese characters are readable in AL32UTF8 database.
- source database (US7ASCII)
export NLS_LANG=AMERICAN_AMERICA.US7ASCII
export LANG=AMERICAN_AMERICA.US7ASCII
exp userid='/ as sysdba' file=export.dmp full=y
- target database (AL32UTF8)
export NLS_LANG=AMERICAN_AMERICA.US7ASCII
export LANG=AMERICAN_AMERICA.US7ASCII
imp userid='/ as sysdba' file=export.dmp full=y ignore=y
Result:
from US7ASCII to AL32UTF8:
the chinese characters cannot be read
from US7ASCII to ZHT16MSWIN950:
the chinese characters cannot be read
from ZHT16MSWIN950 to AL32UTF8:
the chinese characters can be read
How can I convert the chinese character from US7ASCCI to UTF8 database?
how do we know database character set is either single character set or multi character set?
While changing character-set from AL32UTF8 to WE8MSWIN1252 got "ORA-12712: new character set must be a superset of old character set".
Below are steps taken to resolve the issue -
ALTER DATABASE CHARACTER SET WE8MSWIN1252;
i got this error: ORA-12712: new character set must be a superset of old character set
below are the commands executed by me:
SQL> SHUTDOWN IMMEDIATE;
SQL> CONNECT SYS/password AS SYSDBA;
SQL> STARTUP MOUNT;
SQL> ALTER SYSTEM ENABLE RESTRICTED SESSION;
SQL> ALTER DATABASE OPEN;
SQL> ALTER DATABASE CHARACTER SET INTERNAL_USE WE8MSWIN1252;
SQL> SHUTDOWN;
SQL> STARTUP;
SQL> QUIT;
And its working...
I have not done it in proper order. Neither have done ccsscan. Still, no user reported any issues. Do my changes truncated the data?
While creating my database manually i got error
sql> create database orcl
>national character set utf8
national character set utf8
*
ORA:12701 CREATE DATABASE CHARACTER SET IS UN KNOWN...
where
sql> create database orcl
> character set WE8ISO8859P1
is successful...
I'm try to import a table of data (character set: CL8ISO8859P5) to another database (character set: AL32UTF8) using exp/imp utility.After the import, all Cyrillic text was corrupted!
View 5 Replies View Relatedi have a oracle server installed enterprise edition, for some reation i need to degrade the version from enterprise to standard
i need same tablespace,data's everything same as of now.
We are converting WE8ISO8859P1 oracle db character set to AL32UTF8. Before conversion, i want to check implication on PL/SQL code for byte based SQL functions.
What all points to consider while checking implications on PL / SQL code? I could find 3 methods on Google surfing, SUBSTRB, LENGTHB, INSTRB. What do I check if these methods are used in PL/SQL code?
What all other methods should I check? What do I check in PL/SQL if varchar and char type declarations exist in code? How do i check implication of database character set change to AL32UTF8 for byte bases SQL function.
we have to migrate data from 11.1.0.6.0 to 11.2.0.1.0
Version : 11.1.0.6.0 character set : WE8MSWIN1252
Version : 11.2.0.1.0 character set : AL32UTF8
Any hints with which we can go.
How to change db timezone parameter. My application team has asked me to change the db timzone parameter by following sql.
ALTER database SET TIME_ZONE = '+10:00';
Is this way is the correct one , and do we have any impact on database and does it require a db bounce.
As per the bellow the default XML storage has been changed in 11gr2.
docs.oracle.com/cd/E11882_01/appdev.112/e10492/whatsnew.htm
Quote:
Oracle Database 11g Release 2 (11.2.0.2) New Features in Oracle XML DB
The following Oracle XML DB features are new in Oracle Database 11g Release 2 (11.2.0.2).
Default Storage Model for XMLType
The default XMLType storage model is used if you do not specify a storage model when you create an XMLType table or column. Prior to Oracle Database 11g Release 2 (11.2.0.2), unstructured (CLOB) storage was used by default. The default storage model is now binary XML storage.
We have a application which works fine on r1 but not on r2 due to this change, we are going to investigate resolving the issue on the application in the future, in the mean time we need to be able to use the CLOB storage.
Does any one know where we can change this functionality back to the pre 11gR2 change?
When I created a new oracle database the port number was 1521 (default), but I want to change it to 1522.
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SQL> select * from v$version;
BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - Production
PL/SQL Release 11.2.0.1.0 - Production
CORE 11.2.0.1.0 Production
TNS for 32-bit Windows: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - Production
[code]....
Which config file is used to change the os version(RHEL 4.0 to RHEL 5.5) by OS admin what will be its impact on ORACLE Databases.
View 3 Replies View RelatedWhat is best practice to change small disk D:? I am beginner with Oracle. 10g on W2008. 5 datafiles (all indexes,second data file, 2 undotabs)*.dbf (34;30;1;34;12 GB) is on D:. Part of tablespaces (1 data, 1 undo)has files on c:.
I.
1.Shutdown 2008 server.
2.Copy D: image with GHOST to USB, network.
3.Connect new D, create RAID.
4.Restore image to D.
5.Start 2008 server.
II.
1.Stop application.
2.CONNECT AS SYSDBA
3.SHUTDOWN NORMAL or (IMMEDIATE)?
4.Copy files *.dbf at OS level from d: to ... USB disk, network.
5.Shutdown 2008 server.
6.Change disks, create RAID in BIOS.
7.Start W2008.
Is Oracle at this moment in SHUTDOWN mode?
8.Copy back *.dbf to new D: (with directory structure).
9.STARTUP Oracle.
I have a table in that table ename column the data type is VARCHAR2(40).
In that column the name is like kumar's and Caño
I have created text file using spool it's showing like
Reño kumar¿s
Why only for kumar's it's showing like "¿" this.
When I was going through the Enterprise Manager Grid Control, I found an error due to which I looked at the trace file and it said:
ORA-07445: exception encountered: core dump ACCESS_VIOLATION unable_to_trans_pc PC:0x7C81BD02 ADDR:0x49444E49 UNABLE_TO_READ]
I searched and found that it has something to do with the SGA parameters. I saw that the shared_pool_size and the sga_target paramters are set to 0...Also there are certain SQLs hanging at some point. I thought I should change the above mentioned parameters.
My question now is, can I use the Alter System statements from the SQL Plus to change these parameters, and do they change immediately or do I need to reboot the Oracle instance for those changes to take effect? I would like to do:
alter system set sga_target=400m;
alter system set shared_pool_size=200m;
would these work and take effect immediately?
This facility has one last 10g database and a very problematic tablespace and last datafile associated with it. The tablespace was set up with INITIAL_ EXTENT of 131,072 (128K) instead of the more 'normal' 4,194,304 (4M) and NEXT_EXTENT of 262,144 (256K) instead of 4,194,304 (4M).
More worryingly, the datafile has INCREMENT_BY set to 1 (8K) instead of 1,280 (10M) or 2,048 (16M).Has anyone ever updated sys.ts$.dflinit and sys.ts$. dflincr to modify the INITIAL_EXTENT and NEXT_EXTENT, and sys.file$.inc to modify the INCREMENT_BY?
1-how can i alter/change the size of tablespaces?.
2-is any changing in tablespace size will effect the over all performance?
Tablespace ; Size (MB); Free (MB); % Free; % Used
------------------------------;----------;----------;----------;----------
USERS ; 5; 4; 80; 20
SYSAUX ; 600; 140.875; 23; 77
UNDOTBS1 ; 640; 114.125; 18; 82
SYSTEM ; 700; 28.3125; 4; 96
TEMP ; 64; 0; 0; 100
SQL> update t set a = 1 where b = 2; -- must have redo record
2 rows updated.
SQL> rollback;
the above redo record that uncommit changed must be written from redo buffer to the online redo logfile. why Oracle write the redo record that uncommit changed to the online redo logfile ? when it will be used?
While renaming the datafile.
1) ALTER TABLESPACE .... OFFLINE;
2) CHANGING THE DATAFILE NAME IN OS LEVEL;
3) ALTER TABLESPACE .... RENAME DATAFILE 'FILE_OLD' TO 'FILE_NEW';
4) ALTER TABLESPACE .... ONLINE;
In the above steps, I HAD FORGOTTON TO FOLLOW THE 2ND STEP.
At the step of 3rd, i got error message, now i am not able to change the name in OS level Also.
I want to change cursor_sharing, open_cursors and session_cached_cursors parameter values for SPFILE (Only SPFILE) using SQL Query.
I have found following SQL Queries, but I don't know these queries are only for SPFILE or not.
ALTER SESSION SET cursor_sharing='EXACT';
ALTER system set open_cursors=2500;
ALTER SESSION set session_cached_cursors=70;
I need SQL Queries only for SPFILE.
I am currently in the process of migrating our database from US7ASCII to AL32UTF8 using DMU.
I am stuck at a point where I have encrypted data that, when the conversion happens, will be destroyed. Oracle suggests to move the data which is currently stored in VARCHAR2 datatype, to a "character set safe way" like hex notation or base64 before converting.
Does dbms_redefinition can move the tablespace to another of a table,including indexes?
View 4 Replies View RelatedHow to change the attributes of a table from nologging to logging?
SQL> select table_name,LOGGING from dba_tables where owner='HXL';
TABLE_NAME LOG
------------------------------ ---
TB_OBJECTS NO
SQL> alter table hxl.tb_test logging;
Table altered.
SQL> select table_name,LOGGING from dba_tables where owner='HXL';
TABLE_NAME LOG
------------------------------ ---
TB_OBJECTS NO
We have one primary oracle database 10.2 and standby by database with no data guard. Initially we have 2 redo log group in primary and standby database.
We have recently add 2 more redo log and increase the size of log member from 50m to 200m in primary database. We don't have any problem in primary database.but in standby database we face a problem because we cannot open it. It always in mount stage in which . How we change the size of current redo log because we can't run. Alter system switch logfile command in mount stage.