In the 19c Primary database, where I want to create NEWPDB as a no-data clone of ORCLPDB1 :
SQL> select con_id, name, open_mode from v$pdbs;
CON_ID
----------
NAME
--------------------------------------------------------------------------------------------------------------------------------
OPEN_MODE
----------
2
PDB$SEED
READ ONLY
3
ORCLPDB1
READ WRITE
SQL> alter pluggable database ORCLPDB1 close;
Pluggable database altered.
SQL> alter pluggable database ORCLPDB1 open read only;
Pluggable database altered.
SQL> show parameter db_create_file_dest
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_create_file_dest string /opt/oracle/oradata
SQL>
SQL> create pluggable database newpdb
2 from orclpdb1
3 storage (maxsize 10G)
4 service_name_convert=('ORCLPDB1','NEWPDB')
5 user_tablespaces=NONE
6 standbys=ALL
7 no data
8 /
Pluggable database created.
SQL>
SQL> select name
2 from v$datafile
3 where con_id =
4 (select con_id
5 from v$pdbs
6 where name = 'NEWPDB')
7 order by file#
8 /
NAME
------------------------------------------------------------------------------------------------------------------------------------
/opt/oracle/oradata/ORCLCDB/AEBBE124BDA608FAE0530100007F00D7/datafile/o1_mf_system_hodnt79n_.dbf
/opt/oracle/oradata/ORCLCDB/AEBBE124BDA608FAE0530100007F00D7/datafile/o1_mf_sysaux_hodnt7bk_.dbf
/opt/oracle/oradata/ORCLCDB/AEBBE124BDA608FAE0530100007F00D7/datafile/o1_mf_undotbs1_hodnt7bm_.dbf
SQL>
SQL> select name
2 from v$datafile
3 where con_id =
4 (select con_id
5 from v$pdbs
6 where name = 'ORCLPDB1')
7 order by file#
8 /
NAME
------------------------------------------------------------------------------------------------------------------------------------
/opt/oracle/oradata/ORCLCDB/ORCLPDB1/system01.dbf
/opt/oracle/oradata/ORCLCDB/ORCLPDB1/sysaux01.dbf
/opt/oracle/oradata/ORCLCDB/ORCLPDB1/undotbs01.dbf
/opt/oracle/oradata/ORCLCDB/ORCLPDB1/users01.dbf
SQL>
Notice how the NEWPDB does NOT have a USERS datafile as I specified "user_tablespaces=NONE".
Also note that while the ORCLPDB1 had a different naming format, NEWPDB relies on what I have specified as "db_create_file_dest" to create Oracle Managed Files as datafiles (incuding the Undo Tablespace datafile)
Also, the "no data" ensures that no user data is copied, only the database template(data dictionary) is copied. User-created tables and indexes are excluded. (should we test to see which types of user-created objects are included/excluded ?)
The source PDB had to be Read Only but the cloned NEWDB is not OPEN when created.
I have a Service called "newpdb" created for the new PDB.
SQL> alter pluggable database orclpdb1 close;
Pluggable database altered.
SQL> alter pluggable database orclpdb1 open read write;
Pluggable database altered.
SQL> alter pluggable database newpdb close;
alter pluggable database newpdb close
*
ERROR at line 1:
ORA-65020: pluggable database NEWPDB already closed
SQL> alter pluggable database newpdb open read write;
Pluggable database altered.
SQL>
The source PDB had to be Read Only but the cloned NEWDB is not OPEN when created.
SQL> select service_id, name, network_name, creation_date, pdb, con_id
2 from v$services
3 order by 1
4 /
SERVICE_ID NAME NETWORK_NAME CREATION_ PDB CON_ID
---------- ---------------------------------------------------------------- ---------------- --------- -------- ----------
1 SYS$BACKGROUND 17-APR-19 CDB$ROOT 1
2 SYS$USERS 17-APR-19 CDB$ROOT 1
5 ORCLCDBXDB ORCLCDBXDB 04-MAY-19 CDB$ROOT 1
6 ORCLCDB ORCLCDB 04-MAY-19 CDB$ROOT 1
8 orclpdb1 orclpdb1 04-MAY-19 ORCLPDB1 3
10 newpdb newpdb 07-SEP-20 NEWPDB 4
6 rows selected.
SQL>
SQL> select service_id, name, con_id
2 from v$active_services
3 order by service_id
4 /
SERVICE_ID NAME CON_ID
---------- ---------------------------------------------------------------- ----------
1 SYS$BACKGROUND 1
2 SYS$USERS 1
5 ORCLCDBXDB 1
6 ORCLCDB 1
8 orclpdb1 3
10 newpdb 4
6 rows selected.
SQL>
I have a Service called "newpdb" created for the new PDB.
How and when does the PDB propagate to the Standby ?
After I issue
The Standby alert log shows :
The datafiles at the Standby are also created as as Oracle Managed Files, relying on "db_create_file_dest". But the alert log messages clearly show that it did a *local* copy of the datafiles from ORCLPDB1 instead of copying the new datafiles across the network.
SQL> alter system archive log current;
System altered.
SQL>
The Standby alert log shows :
2020-09-07T23:46:09.815590+08:00
Recovery created pluggable database NEWPDB
2020-09-07T23:46:16.818755+08:00
Recovery copied files for tablespace SYSTEM
Recovery successfully copied file /opt/oracle/oradata/STDBYDB/AEBBE124BDA608FAE0530100007F00D7/datafile/o1_mf_system_hodnt79n_.dbf from /opt/oracle/oradata/STDBYDB/ORCLPDB1/system01.dbf
NEWPDB(4):Successfully added datafile 13 to media recovery
NEWPDB(4):Datafile #13: '/opt/oracle/oradata/STDBYDB/AEBBE124BDA608FAE0530100007F00D7/datafile/o1_mf_system_hodnt79n_.dbf'
2020-09-07T23:46:27.355523+08:00
Recovery copied files for tablespace SYSAUX
Recovery successfully copied file /opt/oracle/oradata/STDBYDB/AEBBE124BDA608FAE0530100007F00D7/datafile/o1_mf_sysaux_hodnt7bk_.dbf from /opt/oracle/oradata/STDBYDB/ORCLPDB1/sysaux01.dbf
NEWPDB(4):Successfully added datafile 14 to media recovery
NEWPDB(4):Datafile #14: '/opt/oracle/oradata/STDBYDB/AEBBE124BDA608FAE0530100007F00D7/datafile/o1_mf_sysaux_hodnt7bk_.dbf'
2020-09-07T23:46:35.160960+08:00
Recovery copied files for tablespace UNDOTBS1
Recovery successfully copied file /opt/oracle/oradata/STDBYDB/AEBBE124BDA608FAE0530100007F00D7/datafile/o1_mf_undotbs1_hodnt7bm_.dbf from /opt/oracle/oradata/STDBYDB/ORCLPDB1/undotbs01.dbf
NEWPDB(4):Successfully added datafile 15 to media recovery
NEWPDB(4):Datafile #15: '/opt/oracle/oradata/STDBYDB/AEBBE124BDA608FAE0530100007F00D7/datafile/o1_mf_undotbs1_hodnt7bm_.dbf'
2020-09-07T23:46:37.523453+08:00
PR00 (PID:2275): Media Recovery Waiting for T-1.S-80 (in transit)
2020-09-07T23:46:37.557413+08:00
Recovery of Online Redo Log: Thread 1 Group 4 Seq 80 Reading mem 0
Mem# 0: /opt/oracle/oradata/STDBYDB/stdbredo01.log
The datafiles at the Standby are also created as as Oracle Managed Files, relying on "db_create_file_dest". But the alert log messages clearly show that it did a *local* copy of the datafiles from ORCLPDB1 instead of copying the new datafiles across the network.