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Service registration 19c database

Dear Experts,

We have upgraded database 12c(noncdb) to 19c(cdb with one pluggable database).SUPPDB is pdb and suppcdb is cdb.

I have a general question. Can you please clarify, how the services (suppdb,ebs_suppdb,SUPPDB_ebs_patch) are registered with the cdb listener. Service_names parameter doesn't shows these services.

SQL> sho pdbs

  CON_ID CON_NAME            OPEN MODE RESTRICTED
---------- ------------------------------ ---------- ----------
     2 PDB$SEED            READ ONLY NO
     3 SUPPDB             READ WRITE NO

SQL> sho parameter service

NAME                 TYPE    VALUE
------------------------------------ ----------- ------------------------------
service_names            string   suppcdb

SQL> alter session set container=SUPPDB;

Session altered.

SQL> sho parameter service

NAME                 TYPE    VALUE
------------------------------------ ----------- ------------------------------
service_names            string   suppcdb


[orasupp@erpsupportdb 19.3.0]$ lsnrctl status suppcdb

LSNRCTL for Linux: Version 19.0.0.0.0 - Production on 27-JAN-2023 09:28:51

Copyright (c) 1991, 2022, Oracle. All rights reserved.

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=erpsupportdb.ttd.com)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias           suppcdb
Version          TNSLSNR for Linux: Version 19.0.0.0.0 - Production
Start Date        13-DEC-2022 17:17:07
Uptime          44 days 16 hr. 11 min. 43 sec
Trace Level        off
Security         ON: Local OS Authentication
SNMP           OFF
Listener Parameter File  /u01/SUPPDB/19.3.0/network/admin/listener.ora
Listener Log File     /u01/SUPPDB/19.3.0/log/diag/tnslsnr/erpsupportdb/suppcdb/alert/log.xml
Listening Endpoints Summary...
 (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=erpsupportdb.ttd.com)(PORT=1521)))
 (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=erpsupportdb.ttd.com)(PORT=5510))(Presentation=HTTP)(Session=RAW))
Services Summary...
Service "28182bc4cf6c4887e053b340d20a8b55" has 1 instance(s).
 Instance "suppcdb", status READY, has 1 handler(s) for this service...
Service "86b637b62fdf7a65e053f706e80a27ca" has 1 instance(s).
 Instance "suppcdb", status READY, has 1

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