O Oracle Database 18c apresenta o conceito de frota de CDB, que é uma coleção de diferentes CDBs que podem ser gerenciados como um CDB lógico.
No momento, esse recurso está restrito à Enterprise Edition em sistemas projetados, como Exadata e Enterprise Edition em Oracle Database Cloud Services.
Existem duas funções possíveis em uma frota:LEAD_CDB e MEMBER_CDB . O LEAD_CDB pode ser definido definindo a propriedade LEAD_CDB como “TRUE”. Todos os outros CDBs da frota atuariam como MEMBER_CDBs.
No exemplo abaixo temos dois CDBs e PDBs nele.
cdbvert011 :Banco de dados container com bancos de dados plugáveis PDBDP, PDBDW, PDBMV, PDBSWD e PDBADDADOS. Este será o líder da frota.
cdbhor011 :Banco de dados de contêiner com banco de dados plugável PDBWEBDW1.
Bancos de dados plugáveis no Container Database cdbvert011 :
$ export ORACLE_SID=cdbvert011 $ sqlplus / as sysdba SQL*Plus: Release 18.0.0.0.0 - Production on Wed May 27 08:36:16 2020 Version 18.2.0.0.0 Copyright (c) 1982, 2018, Oracle. All rights reserved. Connected to: Oracle Database 18c Enterprise Edition Release 18.0.0.0.0 - Production Version 18.2.0.0.0 sql> show pdbs; CON_ID CON_NAME OPEN MODE RESTRICTED ---------- ------------------------------ ---------- ---------- 2 PDB$SEED READ ONLY NO 3 PDBDP READ WRITE NO 4 PDBDW READ WRITE NO 5 PDBMV READ WRITE NO 6 PDBSWD READ WRITE NO 7 PDBADDADOS READ WRITE NO
Banco de dados conectável no Container Database cdbhor011:
$ export ORACLE_SID=cdbhor011 $ sqlplus / as sysdba SQL*Plus: Release 18.0.0.0.0 - Production on Wed May 27 08:36:16 2020 Version 18.2.0.0.0 Copyright (c) 1982, 2018, Oracle. All rights reserved. Connected to: Oracle Database 18c Enterprise Edition Release 18.0.0.0.0 - Production Version 18.2.0.0.0 sql> show pdbs; CON_ID CON_NAME OPEN MODE RESTRICTED ---------- ------------------------------ ---------- ---------- 2 PDB$SEED READ ONLY NO 3 PDBWEBDW1 READ WRITE NO
Configure CDBVERT011 como LEAD CDB:
sql> select property_value from database_properties where property_name='LEAD_CDB'; no rows selected sql> alter database set lead_cdb=TRUE; Database altered. sql> select property_value from database_properties where property_name='LEAD_CDB'; PROPERTY_VALUE ------------------------------ TRUE
Conceda os privilégios apropriados ao usuário comum no lead do CDB:
sql> grant sysoper to system CONTAINER=ALL; Grant succeeded.
Crie o link do banco de dados e defina como membro da frota:
Connected to: Oracle Database 18c Enterprise Edition Release 18.0.0.0.0 - Production Version 18.2.0.0.0 sql> select property_value from database_properties where property_name='LEAD_CDB_URI'; no rows selected sql> create database link dblink_lead connect to system identified by password using 'CDBVERT011'; Database link created. sql> alter database set LEAD_CDB_URI='dblink:dblink_lead'; Database altered. sql> select property_value from database_properties where property_name='LEAD_CDB_URI'; PROPERTY_VALUE -------------------------------------------------------------------------------- dblink:dblink_lead
Conecte-se no CDBVERT011 e liste todos os PDBs. O valor STUB na coluna STATUS define o CDB e seus PDBs como membros da frota. Depois de configurar a frota de CDB, as informações do PDB dos vários membros do CDB, incluindo o membro do CDB, são sincronizadas com o CDB principal.
$ export ORACLE_SID=cdbvert011 $ sqlplus / as sysdba SQL*Plus: Release 18.0.0.0.0 - Production on Wed May 27 08:36:16 2020 Version 18.2.0.0.0 Copyright (c) 1982, 2018, Oracle. All rights reserved. Connected to: Oracle Database 18c Enterprise Edition Release 18.0.0.0.0 - Production Version 18.2.0.0.0 sql> show pdbs; CON_ID CON_NAME OPEN MODE RESTRICTED ---------- ------------------------------ ---------- ---------- 2 PDB$SEED READ ONLY NO 3 PDBDP READ WRITE NO 4 PDBDW READ WRITE NO 5 PDBMV READ WRITE NO 6 PDBSWD READ WRITE NO 7 PDBADDADOS READ WRITE NO 9 PDBWEBDW1 MOUNTED sql> select pdb_id, pdb_name, status, is_proxy_pdb from dba_pdbs; PDB_ID PDB_NAME STATUS IS_PROXY_ ------- -------- ------ ---------- 3 PDBDP NORMAL NO 2 PDB$SEED NORMAL NO 4 PDBDW NORMAL NO 5 PDBMV NORMAL NO 6 PDBSWD NORMAL NO 7 PDBADDADOS NORMAL NO 8 CDBHOR011 STUB YES 9 PDBWEBDW1 STUB YES 8 rows selected.
Desabilite o Lead CDB:
sql> ALTER DATABASE SET LEAD_CDB = false; Database altered. sql> select pdb_id, pdb_name, status, is_proxy_pdb from dba_pdbs; PDB_ID PDB_NAME STATUS IS_PROXY_ ------- -------- ------ ---------- 3 PDBDP NORMAL NO 2 PDB$SEED NORMAL NO 4 PDBDW NORMAL NO 5 PDBMV NORMAL NO 6 PDBSWD NORMAL NO 7 PDBADDADOS NORMAL NO 6 rows selected.
Desabilite o Membro CDB:
sql> alter database set lead_cdb_uri=''; Database altered. sql> select pdb_id, pdb_name, status, is_proxy_pdb from dba_pdbs; PDB_ID PDB_NAME STATUS IS_PROXY_ ------- -------- ------ ---------- 3 PDBWEBDW1 NORMAL NO 2 PDB$SEED NORMAL NO sql> drop database link dblink_lead; Database link dropped.
Referências
Administrando uma Frota CDB. Disponível em https://docs.oracle.com/en/database/oracle/oracle-database/18/multi/administering-cdb-fleet.html#GUID-0AA7FC65-F350-473B-96D2-976313514069
