Oracle Multitenant : DBCA PDB Relocate in Oracle Database 19c_综合

参考：Oracle Multitenant Administrator’s Guide

Oracle Database 12c Release 2 (12.2) 引入了使用该CREATE PLUGGABLE DATABASE命令重定位可插拔数据库（PDB）的功能。在Oracle 19c中，现在可以使用Database Configuration Assistant（DBCA）执行可插拔数据库（PDB）的重定位。

1. 预备需求

准备重新定位、连接到目标CDB

-- 登录目标库export ORAENV_ASK=NO
export ORACLE_SID=cdb3
. oraenv
export ORAENV_ASK=YESsqlplus / as sysdba

在目标数据库创建用户。在这种情况下，我们将在目标PDB中使用普通用户

CREATE USER c##remote_clone_user IDENTIFIED BY remote_clone_user CONTAINER=ALL;
GRANT CREATE SESSION, CREATE PLUGGABLE DATABASE TO c##remote_clone_user CONTAINER=ALL;
GRANT SYSOPER TO c##remote_clone_user CONTAINER=ALL;

与常规重定位不同，我们不需要创建dblink。我们只需要提供用于创建链接的权限。DBCA完成剩下的工作。

检查目标CDB是否处于local undo mode和archivelog mode。

--- 登录目标CDB，查看状态CONN / AS SYSDBACOLUMN property_name FORMAT A30
COLUMN property_value FORMAT A30SELECT property_name, property_value FROM database_properties WHERE property_name = 'LOCAL_UNDO_ENABLED';PROPERTY_NAME                  PROPERTY_VALUE
------------------------------ ------------------------------
LOCAL_UNDO_ENABLED             TRUESQL>SELECT log_mode FROM v$database;LOG_MODE
------------
ARCHIVELOG

目标CDB处于local undo mode和archivelog mode，因此我们无需将目标CDB转为只读模式。

连接到源CDB并准备重新定位。

--- 登录源CBDexport ORAENV_ASK = NO
export ORACLE_SID = cdb1
.oraenv
export ORAENV_ASK = YESsqlplus / as sysdba

检查源CDB是否处于local undo mode和archivelog mode。

--- 登录源CDBCONN / AS SYSDBACOLUMN property_name FORMAT A30
COLUMN property_value FORMAT A30SELECT property_name, property_value FROM database_properties WHERE property_name = 'LOCAL_UNDO_ENABLED';PROPERTY_NAME                  PROPERTY_VALUE
------------------------------ ------------------------------
LOCAL_UNDO_ENABLED             TRUESQL>SELECT log_mode FROM v$database;LOG_MODE
------------
ARCHIVELOGSQL>

2. 使用DBCA重新定位PDB

Oracle 19c中，-relocatePDB引入了DBCA 命令，允许我们将PDB重定位到不同的容器数据库（CDB）。

-relocatePDB - Command to Relocate a pluggable database.-remotePDBName <Name of the pluggable database to clone/relocate>-pdbName <Pluggable database name>-dbLinkUsername <Common user of a remote CDB, used by database link to connect to remote CDB.>-remoteDBConnString <EZCONNECT string to connect to Source database for example "host:port/servicename">-sourceDB <Database unique name for RAC database or SID for Single Instance database>[-remoteDBSYSDBAUserName <User name with SYSDBA privileges of remote database>][-dbLinkUserPassword <Common user password of a remote CDB, used by database link to connect to remote CDB.>][-useWalletForDBCredentials <true | false> Specify true to load database credentials from wallet]-dbCredentialsWalletLocation <Path of the directory containing the wallet files>[-dbCredentialsWalletPassword <Password to open wallet with auto login disabled>][-remoteDBSYSDBAUserPassword <Password for remoteDBSYSDBAUserName user of remote database.>][-sysDBAUserName <User name  with SYSDBA privileges>][-sysDBAPassword <Password for sysDBAUserName user name>]

注：dbca -relocatePDB -help 查询正确用法。

确保环境配置为源实例“cdb1”，并从“cdb2”实例中重新定位PDB

--- 登录源CDB，重定位pdb2export ORACLE_SID=cdb1
export ORAENV_ASK=NO
. oraenv
export ORAENV_ASK=YESdbca -silent \-relocatePDB \-pdbName pdb2 \-sourceDB cdb1 \-remotePDBName pdb2 \-remoteDBConnString node2dg:1521/cdb2 \-remoteDBSYSDBAUserName sys \-remoteDBSYSDBAUserPassword SysPassword1 \-dbLinkUsername c##remote_clone_user \-dbLinkUserPassword remote_clone_user
Prepare for db operation
50% complete
Create pluggable database using relocate PDB operation
100% complete
Pluggable database "pdb2" plugged successfully.
Look at the log file "/app/oracle/cfgtoollogs/dbca/cdb1/pdb2/cdb10.log" for further details.
$

连接到源CDB并检查新PDB的状态

--- 登录源CDBCOLUMN name FORMAT A30SELECT con_id, name, open_mode FROM v$pdbs ORDER BY 1;CON_ID NAME                           OPEN_MODE
---------- ------------------------------ ----------2 PDB$SEED                       READ ONLY3 PDB1                           READ WRITE4 PDB2                           READ WRITESQL>

要重新定位它，我们需要在源数据库中创建链接用户

CREATE USER c##remote_clone_user IDENTIFIED BY remote_clone_user CONTAINER=ALL;
GRANT CREATE SESSION, CREATE PLUGGABLE DATABASE TO c##remote_clone_user CONTAINER=ALL;
GRANT SYSOPER TO c##remote_clone_user CONTAINER=ALL;

确保环境配置为目标实例“cdb2”，并从“cdb1”实例中名为“pdb1”的本地PDB重新定位名为“pdb1”的PDB

--- 登录目标CDBexport ORACLE_SID=cdb2
export ORAENV_ASK=NO
. oraenv
export ORAENV_ASK=YESdbca -silent \-relocatePDB \-pdbName pdb1 \-sourceDB cdb2 \-remotePDBName pdb1 \-remoteDBConnString node2:1521/cdb1 \-remoteDBSYSDBAUserName sys \-remoteDBSYSDBAUserPassword SysPassword1 \-dbLinkUsername c##remote_clone_user \-dbLinkUserPassword remote_clone_user
Prepare for db operation
50% complete
Create pluggable database using relocate PDB operation
100% complete
Pluggable database "pdb1" plugged successfully.
Look at the log file "/app/oracle/cfgtoollogs/dbca/cdb2/pdb1/cdb10.log" for further details.
$

连接到目标CDB并检查新PDB的状态

--- 登录目标CDBCOLUMN name FORMAT A30SELECT con_id, name, open_mode FROM v$pdbs ORDER BY 1;CON_ID NAME                           OPEN_MODE
---------- ------------------------------ ----------2 PDB$SEED                       READ ONLY3 PDB2                           READ WRITE4 PDB1                           READ WRITESQL>

附

# Local container (cdb1).
dbca -silent -createDatabase \-templateName General_Purpose.dbc \-gdbname cdb1 -sid cdb1 -responseFile NO_VALUE \-characterSet AL32UTF8 \-sysPassword SysPassword1 \-systemPassword SysPassword1 \-createAsContainerDatabase true \-numberOfPDBs 1 \-pdbName pdb1 \-pdbAdminPassword PdbPassword1 \-databaseType MULTIPURPOSE \-automaticMemoryManagement false \-totalMemory 2048 \-storageType FS \-datafileDestination "+DATA/nineteenc/" \-redoLogFileSize 50 \-emConfiguration NONE \-ignorePreReqs# Remote container (cdb2) with PDB (pdb2).
dbca -silent -createDatabase \-templateName General_Purpose.dbc \-gdbname cdb2 -sid cdb2 -responseFile NO_VALUE \-characterSet AL32UTF8 \-sysPassword SysPassword1 \-systemPassword SysPassword1 \-createAsContainerDatabase true \-numberOfPDBs 1 \-pdbName pdb2 \-pdbAdminPassword PdbPassword1 \-databaseType MULTIPURPOSE \-automaticMemoryManagement false \-totalMemory 2048 \-storageType FS \-datafileDestination "+DATA/nodetwodg/" \-redoLogFileSize 50 \-emConfiguration NONE \-ignorePreReqs# Delete the instances.
#dbca -silent -deleteDatabase -sourceDB cdb1 -sysDBAUserName sys -sysDBAPassword SysPassword1
#dbca -silent -deleteDatabase -sourceDB cdb2 -sysDBAUserName sys -sysDBAPassword SysPassword1

数据库启用了Oracle Managed Files（OMF）并切换到archivelog模式

export ORAENV_ASK=NO
export ORACLE_SID=cdb3
. oraenv
export ORAENV_ASK=YESsqlplus / as sysdba <<EOFALTER SYSTEM SET db_create_file_dest = '+DATA/nodetwodg';SHUTDOWN IMMEDIATE;
STARTUP MOUNT;
ALTER DATABASE ARCHIVELOG;
ALTER DATABASE OPEN;ALTER PLUGGABLE DATABASE pdb2 OPEN;
ALTER PLUGGABLE DATABASE pdb2 SAVE STATE;EXIT;
EOFexport ORAENV_ASK=NO
export ORACLE_SID=cdb1
. oraenv
export ORAENV_ASK=YESsqlplus / as sysdba <<EOFALTER SYSTEM SET db_create_file_dest = '+DATA/nineteenc';SHUTDOWN IMMEDIATE;
STARTUP MOUNT;
ALTER DATABASE ARCHIVELOG;
ALTER DATABASE OPEN;ALTER PLUGGABLE DATABASE pdb1 OPEN;
ALTER PLUGGABLE DATABASE pdb1 SAVE STATE;EXIT;
EOF