{"id":17110,"date":"2022-02-10T15:41:13","date_gmt":"2022-02-10T14:41:13","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/character-sets-and-oracle-21c-pdbs-how-it-works\/"},"modified":"2023-06-20T10:05:25","modified_gmt":"2023-06-20T08:05:25","slug":"character-sets-and-oracle-21c-pdbs-how-it-works","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/character-sets-and-oracle-21c-pdbs-how-it-works\/","title":{"rendered":"Character Sets and Oracle 21c PDBs : How It Works"},"content":{"rendered":"

By Mouhamadou Diaw<\/strong><\/p>\n

When creating a database in a multitenant environment we must understand how character set works for CDB and PDBS.<\/p>\n

In Oracle documentation <\/a> we can find following lines<\/p>\n

-When the character set of the CDB root is AL32UTF8, PDBs that are plugged into the CDB can have a different character set from the CDB root.
\nPDBs that you create from PDB$SEED inherit the AL32UTF8 character set from it, but you can migrate the PDB to a different character set. <\/em><\/p>\n

-When the character set of the root is not AL32UTF8, all PDBs in the CDB use the character set of the CDB root.<\/em><\/p>\n

Let’s see how it works. Suppose I have 2 non-CDB databases DB11G and DB12C and I want to migrate them in an Oracle 21c container.<\/p>\n

\"\"<\/a><\/p>\n

As specified in the documentation we have to create a container with AL32UTF8 as character set. If not, we will not be able to create a PDB with AL32UTF8 as character set.<\/p>\n

Ok so the first step is to create the CDB CDBPROD.<\/p>\n

\n
\n\n\n\n
\n
1<\/div>\n
2<\/div>\n
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4<\/div>\n
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14<\/div>\n
15<\/div>\n
16<\/div>\n
17<\/div>\n
18<\/div>\n
19<\/div>\n<\/td>\n
\n
\n
SQL> show con_name<\/code><\/div>\n
<\/div>\n
CON_NAME<\/code><\/div>\n
------------------------------<\/code><\/div>\n
CDB$ROOT<\/code><\/div>\n
SQL> <\/code>select<\/code> name<\/code> from<\/code> v$<\/code>database<\/code>;<\/code><\/div>\n
<\/div>\n
NAME<\/code><\/div>\n
---------<\/code><\/div>\n
CDBPROD<\/code><\/div>\n
<\/div>\n
SQL> <\/code>select<\/code> value,parameter <\/code>from<\/code> NLS_DATABASE_PARAMETERS <\/code>where<\/code> PARAMETER <\/code>like<\/code> '%CHARACTERSET'<\/code>;<\/code><\/div>\n
<\/div>\n
VALUE\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 PARAMETER<\/code><\/div>\n
----------------------------------- -----------------------------------<\/code><\/div>\n
AL16UTF16\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 NLS_NCHAR_CHARACTERSET<\/code><\/div>\n
AL32UTF8\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 NLS_CHARACTERSET<\/code><\/div>\n
<\/div>\n
SQL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

And in this container CDBPROD let’s create the DB21UTF from seed<\/p>\n

\n
\n\n\n\n
\n
1<\/div>\n
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15<\/div>\n<\/td>\n
\n
\n
SQL> <\/code>CREATE<\/code> PLUGGABLE <\/code>DATABASE<\/code> DB21UTF ADMIN <\/code>USER<\/code> db21admin identified <\/code>by<\/code> root;<\/code><\/div>\n
<\/div>\n
Pluggable <\/code>database<\/code> created.<\/code><\/div>\n
<\/div>\n
SQL> <\/code>alter<\/code> pluggable <\/code>database<\/code> DB21UTF <\/code>open<\/code>;<\/code><\/div>\n
<\/div>\n
Pluggable <\/code>database<\/code> altered.<\/code><\/div>\n
<\/div>\n
SQL> show pdbs<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>CON_ID CON_NAME\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/code>OPEN<\/code> MODE\u00a0 RESTRICTED<\/code><\/div>\n
---------- ------------------------------ ---------- ----------<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>2 PDB$SEED\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/code>READ<\/code> ONLY<\/code>\u00a0 NO<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>4 DB21UTF\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/code>READ<\/code> WRITE <\/code>NO<\/code><\/div>\n
SQL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

And in DB21UTF the character set will be same as CDB$ROOT<\/p>\n

\n
\n\n\n\n
\n
1<\/div>\n
2<\/div>\n
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4<\/div>\n
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12<\/div>\n
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14<\/div>\n
15<\/div>\n
16<\/div>\n
17<\/div>\n<\/td>\n
\n
\n
SQL> <\/code>alter<\/code> session <\/code>set<\/code> container=DB21UTF;<\/code><\/div>\n
<\/div>\n
Session altered.<\/code><\/div>\n
<\/div>\n
SQL> show con_name;<\/code><\/div>\n
<\/div>\n
CON_NAME<\/code><\/div>\n
------------------------------<\/code><\/div>\n
DB21UTF<\/code><\/div>\n
SQL> <\/code>select<\/code> value,parameter <\/code>from<\/code> NLS_DATABASE_PARAMETERS <\/code>where<\/code> PARAMETER <\/code>like<\/code> '%CHARACTERSET'<\/code>;<\/code><\/div>\n
<\/div>\n
VALUE\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 PARAMETER<\/code><\/div>\n
------------------------------ ------------------------------<\/code><\/div>\n
AL16UTF16\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 NLS_NCHAR_CHARACTERSET<\/code><\/div>\n
AL32UTF8\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 NLS_CHARACTERSET<\/code><\/div>\n
<\/div>\n
SQL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

And then in DB21UTF, I can import data of DB11G.<\/p>\n

But how can I create the PDB DB21ISO in CDBPROD with WE8ISO8859P15 as character set. One way is to
\n-create another CDB CDBISO with the character set WE8ISO8859P15
\n-create the PDB DBISO in this new CDB CDBISO
\n-Clone this DBISO in the CDBPROD<\/p>\n

Ok let’s do that, below information of the new ISO CDB with the PDB<\/p>\n

\n
\n\n\n\n
\n
1<\/div>\n
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21<\/div>\n<\/td>\n
\n
\n
SQL> <\/code>select<\/code> name<\/code> from<\/code> v$<\/code>database<\/code>;<\/code><\/div>\n
<\/div>\n
NAME<\/code><\/div>\n
---------<\/code><\/div>\n
CDBISO<\/code><\/div>\n
<\/div>\n
SQL> show pdbs<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>CON_ID CON_NAME\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/code>OPEN<\/code> MODE\u00a0 RESTRICTED<\/code><\/div>\n
---------- ------------------------------ ---------- ----------<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>2 PDB$SEED\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/code>READ<\/code> ONLY<\/code>\u00a0 NO<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>3 DB21ISO\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/code>READ<\/code> WRITE <\/code>NO<\/code><\/div>\n
<\/div>\n
SQL> <\/code>select<\/code> value,parameter <\/code>from<\/code> NLS_DATABASE_PARAMETERS <\/code>where<\/code> PARAMETER <\/code>like<\/code> '%CHARACTERSET'<\/code>;<\/code><\/div>\n
<\/div>\n
VALUE\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 PARAMETER<\/code><\/div>\n
------------------------------ ------------------------------<\/code><\/div>\n
AL16UTF16\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 NLS_NCHAR_CHARACTERSET<\/code><\/div>\n
WE8ISO8859P15\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 NLS_CHARACTERSET<\/code><\/div>\n
<\/div>\n
SQL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Now let’s clone DBISO in CDBPROD<\/p>\n

On CDBISO let’s create a user we will use for a database link<\/p>\n

\n
\n\n\n\n
\n
1<\/div>\n
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4<\/div>\n
5<\/div>\n
6<\/div>\n
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\n
\n
SQL> show con_name<\/code><\/div>\n
<\/div>\n
CON_NAME<\/code><\/div>\n
------------------------------<\/code><\/div>\n
CDB$ROOT<\/code><\/div>\n
<\/div>\n
SQL> <\/code>create<\/code> user<\/code> c##clone_user identified <\/code>by<\/code> root <\/code>default<\/code> tablespace users <\/code>temporary<\/code> tablespace <\/code>temp<\/code> container=<\/code>ALL<\/code>;<\/code><\/div>\n
<\/div>\n
User<\/code> created.<\/code><\/div>\n
<\/div>\n
SQL> <\/code>grant<\/code> create<\/code> session, <\/code>create<\/code> pluggable <\/code>database<\/code>, sysoper <\/code>to<\/code> c##clone_user container=<\/code>ALL<\/code>;<\/code><\/div>\n
<\/div>\n
Grant<\/code> succeeded.<\/code><\/div>\n
<\/div>\n
SQL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

On CDBPROD let’s create a database link<\/p>\n

Verify your TNS alias<\/p>\n

\n
\n\n\n\n
\n
1<\/div>\n
2<\/div>\n
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4<\/div>\n
5<\/div>\n
6<\/div>\n
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8<\/div>\n
9<\/div>\n
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13<\/div>\n
14<\/div>\n<\/td>\n
\n
\n
oracle@oraadserver:\/home\/oracle\/ [CDBPROD (CDB$ROOT)] tnsping cdbiso<\/code><\/div>\n
<\/div>\n
TNS Ping Utility <\/code>for<\/code> Linux: Version 21.0.0.0.0 - Production <\/code>on<\/code> 10-FEB-2022 15:44:03<\/code><\/div>\n
<\/div>\n
Copyright (c) 1997, 2021, Oracle.\u00a0 <\/code>All<\/code> rights reserved.<\/code><\/div>\n
<\/div>\n
Used parameter files:<\/code><\/div>\n
\/u01\/app\/oracle\/network\/admin\/sqlnet.ora<\/code><\/div>\n
<\/div>\n
<\/div>\n
Used TNSNAMES adapter <\/code>to<\/code> resolve the alias<\/code><\/div>\n
Attempting <\/code>to<\/code> contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = oraadserver)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = CDBISO)))<\/code><\/div>\n
OK (0 msec)<\/code><\/div>\n
oracle@oraadserver:\/home\/oracle\/ [CDBPROD (CDB$ROOT)]<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Create the dblink<\/p>\n

\n
\n\n\n\n
\n
1<\/div>\n
2<\/div>\n
3<\/div>\n
4<\/div>\n
5<\/div>\n
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22<\/div>\n
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\n
\n
SQL> <\/code>select<\/code> name<\/code> from<\/code> v$<\/code>database<\/code>;<\/code><\/div>\n
<\/div>\n
NAME<\/code><\/div>\n
---------<\/code><\/div>\n
CDBPROD<\/code><\/div>\n
<\/div>\n
SQL> show con_name<\/code><\/div>\n
<\/div>\n
CON_NAME<\/code><\/div>\n
------------------------------<\/code><\/div>\n
CDB$ROOT<\/code><\/div>\n
<\/div>\n
SQL> <\/code>create<\/code> database<\/code> link cloneiso <\/code>connect<\/code> to<\/code> c##clone_user identified <\/code>by<\/code> root using <\/code>'CDBISO'<\/code>;<\/code><\/div>\n
<\/div>\n
Database<\/code> link created.<\/code><\/div>\n
<\/div>\n
SQL> <\/code>select<\/code> * <\/code>from<\/code> dual@cloneiso;<\/code><\/div>\n
<\/div>\n
D<\/code><\/div>\n
-<\/code><\/div>\n
X<\/code><\/div>\n
<\/div>\n
SQL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

And then clone the DBISO PDB in CDBPROD<\/p>\n

\n
\n\n\n\n
\n
1<\/div>\n
2<\/div>\n
3<\/div>\n
4<\/div>\n
5<\/div>\n
6<\/div>\n
7<\/div>\n
8<\/div>\n
9<\/div>\n
10<\/div>\n
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13<\/div>\n
14<\/div>\n
15<\/div>\n
16<\/div>\n
17<\/div>\n
18<\/div>\n
19<\/div>\n<\/td>\n
\n
\n
SQL> <\/code>select<\/code> name<\/code> from<\/code> v$<\/code>database<\/code>;<\/code><\/div>\n
<\/div>\n
NAME<\/code><\/div>\n
---------<\/code><\/div>\n
CDBPROD<\/code><\/div>\n
<\/div>\n
SQL> show con_name<\/code><\/div>\n
<\/div>\n
CON_NAME<\/code><\/div>\n
------------------------------<\/code><\/div>\n
CDB$ROOT<\/code><\/div>\n
<\/div>\n
SQL> <\/code>create<\/code> pluggable <\/code>database<\/code> DB21ISO <\/code>from<\/code> DB21ISO@cloneiso;<\/code><\/div>\n
<\/div>\n
Pluggable <\/code>database<\/code> created.<\/code><\/div>\n
<\/div>\n
SQL> <\/code>alter<\/code> pluggable <\/code>database<\/code> DB21ISO <\/code>open<\/code>;<\/code><\/div>\n
<\/div>\n
Pluggable <\/code>database<\/code> altered.<\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Now let’s verify the state of my PDBs in CDBPROD<\/p>\n

\n
\n\n\n\n
\n
1<\/div>\n
2<\/div>\n
3<\/div>\n
4<\/div>\n
5<\/div>\n
6<\/div>\n
7<\/div>\n
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9<\/div>\n
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11<\/div>\n
12<\/div>\n
13<\/div>\n
14<\/div>\n
15<\/div>\n
16<\/div>\n<\/td>\n
\n
\n
SQL> <\/code>select<\/code> name<\/code> from<\/code> v$<\/code>database<\/code>;<\/code><\/div>\n
<\/div>\n
NAME<\/code><\/div>\n
---------<\/code><\/div>\n
CDBPROD<\/code><\/div>\n
<\/div>\n
SQL><\/code><\/div>\n
<\/div>\n
SQL> show pdbs<\/code><\/div>\n
<\/div>\n
\u00a0\u00a0\u00a0\u00a0<\/code>CON_ID CON_NAME\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/code>OPEN<\/code> MODE\u00a0 RESTRICTED<\/code><\/div>\n
---------- ------------------------------ ---------- ----------<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>2 PDB$SEED\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/code>READ<\/code> ONLY<\/code>\u00a0 NO<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>4 DB21UTF\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/code>READ<\/code> WRITE <\/code>NO<\/code><\/div>\n
\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0<\/code>7 DB21ISO\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 <\/code>READ<\/code> WRITE <\/code>NO<\/code><\/div>\n
SQL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Let’s verify the DB21ISO character set<\/p>\n

\n
\n\n\n\n
\n
1<\/div>\n
2<\/div>\n
3<\/div>\n
4<\/div>\n
5<\/div>\n
6<\/div>\n
7<\/div>\n
8<\/div>\n
9<\/div>\n
10<\/div>\n
11<\/div>\n
12<\/div>\n
13<\/div>\n
14<\/div>\n
15<\/div>\n
16<\/div>\n
17<\/div>\n
18<\/div>\n
19<\/div>\n
20<\/div>\n
21<\/div>\n
22<\/div>\n<\/td>\n
\n
\n
SQL> <\/code>select<\/code> name<\/code> from<\/code> v$<\/code>database<\/code>;<\/code><\/div>\n
<\/div>\n
NAME<\/code><\/div>\n
---------<\/code><\/div>\n
CDBPROD<\/code><\/div>\n
<\/div>\n
SQL> <\/code>alter<\/code> session <\/code>set<\/code> container=DB21ISO;<\/code><\/div>\n
<\/div>\n
Session altered.<\/code><\/div>\n
SQL> <\/code>select<\/code> value,parameter <\/code>from<\/code> NLS_DATABASE_PARAMETERS <\/code>where<\/code> PARAMETER <\/code>like<\/code> '%CHARACTERSET'<\/code>;<\/code><\/div>\n
<\/div>\n
<\/div>\n
SQL> col value <\/code>for<\/code> a35<\/code><\/div>\n
SQL> col parameter <\/code>for<\/code> a35<\/code><\/div>\n
SQL> <\/code>select<\/code> value,parameter <\/code>from<\/code> NLS_DATABASE_PARAMETERS <\/code>where<\/code> PARAMETER <\/code>like<\/code> '%CHARACTERSET'<\/code>;<\/code><\/div>\n
<\/div>\n
VALUE\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 PARAMETER<\/code><\/div>\n
----------------------------------- -----------------------------------<\/code><\/div>\n
AL16UTF16\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 NLS_NCHAR_CHARACTERSET<\/code><\/div>\n
WE8ISO8859P15\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 NLS_CHARACTERSET<\/code><\/div>\n
<\/div>\n
SQL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

And the CDBPROD as seen before has AL32UTF8 as character set<\/p>\n

\n
\n\n\n\n
\n
1<\/div>\n
2<\/div>\n
3<\/div>\n
4<\/div>\n
5<\/div>\n
6<\/div>\n
7<\/div>\n
8<\/div>\n
9<\/div>\n
10<\/div>\n<\/td>\n
\n
\n
SQL> conn \/ <\/code>as<\/code> sysdba<\/code><\/div>\n
Connected.<\/code><\/div>\n
SQL> <\/code>select<\/code> value,parameter <\/code>from<\/code> NLS_DATABASE_PARAMETERS <\/code>where<\/code> PARAMETER <\/code>like<\/code> '%CHARACTERSET'<\/code>;<\/code><\/div>\n
<\/div>\n
VALUE\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 PARAMETER<\/code><\/div>\n
----------------------------------- -----------------------------------<\/code><\/div>\n
AL16UTF16\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 NLS_NCHAR_CHARACTERSET<\/code><\/div>\n
AL32UTF8\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 NLS_CHARACTERSET<\/code><\/div>\n
<\/div>\n
SQL><\/code><\/div>\n<\/div>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n

Conclusion<\/h3>\n

Always use AL32UTF8 for your CDB if possible, in this way you will be able to have PDBs with different character set<\/p>\n","protected":false},"excerpt":{"rendered":"

By Mouhamadou Diaw When creating a database in a multitenant environment we must understand how character set works for CDB and PDBS. In Oracle documentation we can find following lines -When the character set of the CDB root is AL32UTF8, PDBs that are plugged into the CDB can have a different character set from the […]<\/p>\n","protected":false},"author":27,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[229,198,59],"tags":[2477,362,137,223,2478],"type_dbi":[],"class_list":["post-17110","post","type-post","status-publish","format-standard","hentry","category-database-administration-monitoring","category-database-management","category-oracle","tag-al32utf8","tag-character-set","tag-oracle-21c","tag-pluggable-databases","tag-we8iso8859p15"],"acf":[],"yoast_head":"\nCharacter Sets and Oracle 21c PDBs : How It Works - dbi Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dbi-services.com\/blog\/character-sets-and-oracle-21c-pdbs-how-it-works\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Character Sets and Oracle 21c PDBs : How It Works\" \/>\n<meta property=\"og:description\" content=\"By Mouhamadou Diaw When creating a database in a multitenant environment we must understand how character set works for CDB and PDBS. 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