[2022-04-27] refresh PDB
2024-06-06 11:52:49
参考资料：
- Switching Over a Refreshable Clone PDB
About Refreshable Clone PDBs
refresh pdb使用情况如：原PDB所在CDB的主机资源紧张，可以迁走部分PDB减轻主机压力。 或者对PDB做容灾使用等。PDB的刷新可以分两种， 手动刷新和自动刷新。
自动和手动刷新模式
您可以将克隆 PDB 配置为按设定的时间间隔自动刷新，也可以使用ALTER PLUGGABLE DATABASE REFRESH语句手动刷新它。该REFRESH MODE子句仅在CREATE PLUGGABLE DATABASE ... FROM语句中受支持。您可以使用此子句指定以下选项之一：指定REFRESH MODE NONE默认值以创建不可刷新的 PDB。您可以将可刷新的克隆 PDB 更改为普通 PDB，方法是REFRESH MODE NONE在语句中包含该子句，ALTER PLUGGABLE DATABASE然后以读/写模式打开 PDB。您不能将普通 PDB 更改为可刷新的克隆 PDB。可刷新克隆 PDB 转换为普通 PDB 后，您无法将其改回可刷新克隆 PDB。指定REFRESH MODE MANUAL创建必须手动刷新的可刷新 PDB。指定创建一个可刷新的 PDB，该 PDB 在指定的分钟数过后自动刷新。使用自动刷新的可刷新 PDB 也可以手动刷新。 REFRESH MODE EVERY number_of_minutes MINUTES支持三种类型的源端数据库，分别是Local PDB/PDB in a remote CDB/Non-CDB。不管是本地还是远程，都需要创建dblink。
本次测试案例使用同一个CDB，需要使用的PDB为PDB01
SQL> show pdbsCON_ID CON_NAME OPEN MODE RESTRICTED
---------- ------------------------------ ---------- ----------2 PDB$SEED READ ONLY NO3 PDB01 READ WRITE NO4 PDB02 MOUNTED
SQL> 1、确保PDB01是read write状态
In SQL*Plus, connect to cdb1 as a user with administrator privileges, and then ensure sure that cdb1_pdb1 is open in read/write mode (sample output included):
SQL> show pdbsCON_ID CON_NAME OPEN MODE RESTRICTED
---------- ------------------------------ ---------- ----------2 PDB$SEED READ ONLY NO3 PDB01 READ WRITE NO4 PDB02 MOUNTED
SQL> 2、创建一个common用户
Create a common user named c##u1 (replace pwd with a user-specified password):
DROP USER c##u1 CASCADE;
CREATE USER c##u1 IDENTIFIED BY pwd;
GRANT CREATE SESSION, RESOURCE, CREATE ANY TABLE, UNLIMITED TABLESPACE TO c##u1 CONTAINER=ALL;
GRANT CREATE PLUGGABLE DATABASE TO c##u1 CONTAINER=ALL;
GRANT SYSOPER TO c##u1 CONTAINER=ALL;SQL> CREATE USER c##u1 IDENTIFIED BY tiger;User created.SQL> GRANT CREATE SESSION, RESOURCE, CREATE ANY TABLE, UNLIMITED TABLESPACE TO c##u1 CONTAINER=ALL;Grant succeeded.SQL> GRANT CREATE PLUGGABLE DATABASE TO c##u1 CONTAINER=ALL;
GRANT SYSOPER TO c##u1 CONTAINER=ALL;
Grant succeeded.SQL> Grant succeeded.SQL> 3、创建PDB01容器的测试数据
Set the container to cdb1_pdb1, and then create a table t1 to use for testing (sample output included):
ALTER SESSION SET CONTAINER = cdb1_pdb1;
CREATE TABLE t1(n1 NUMBER);
INSERT INTO t1 VALUES(1);
COMMIT;
SELECT * FROM t1;N1
----------1
SQL> ALTER SESSION SET CONTAINER =PDB01;Session altered.SQL> create table t1(id int);Table created.SQL> insert into t1 values (1);1 row created.SQL> commit;Commit complete.SQL> select * from t1 2 ;ID
----------1SQL> 4、连接目标端，创建common用户，由于的源端和目标端是同一个CDB，并且在第二步已经创建common用户，这步就可以忽略
Connect to cdb2 as a user with administrator privileges, and then create the common user named c##u1 (replace pwd with a user-specified password):
CONNECT SYS@cdb2 AS SYSDBA
Enter password: *******DROP USER c##u1 CASCADE;
CREATE USER c##u1 IDENTIFIED BY pwd;
GRANT CREATE SESSION, RESOURCE, CREATE ANY TABLE, UNLIMITED TABLESPACE TO c##u1 CONTAINER=ALL;
GRANT CREATE PLUGGABLE DATABASE TO c##u1 CONTAINER=ALL;
GRANT SYSOPER TO c##u1 CONTAINER=ALL;5、创建到源库的DB LINK
Create a database link to cdb1.
The following command specifies user c##u1, password pwd, and service name cdb1:
CREATE DATABASE LINK cdb1_datalink CONNECT TO c##u1 IDENTIFIED BY pwd USING 'cdb1';配置到PDB01的tns
PDB01 =(DESCRIPTION =(ADDRESS = (PROTOCOL = TCP)(HOST = oracle19cnoadg)(PORT = 1521))(CONNECT_DATA =(SERVER = DEDICATED)(SERVICE_NAME = pdb01)))检查监听
[oracle@oracle19cnoadg ~]$ lsnrctl statusLSNRCTL for Linux: Version 19.0.0.0.0 - Production on 27-APR-2022 11:27:36Copyright (c) 1991, 2019, Oracle. All rights reserved.Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=oracle19cnoadg)(PORT=1521)))
STATUS of the LISTENER
------------------------
Alias LISTENER
Version TNSLSNR for Linux: Version 19.0.0.0.0 - Production
Start Date 27-APR-2022 11:27:11
Uptime 0 days 0 hr. 0 min. 25 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Listener Parameter File /home/oracle/database/network/admin/listener.ora
Listener Log File /oracle/app/diag/tnslsnr/oracle19cnoadg/listener/alert/log.xml
Listening Endpoints Summary...(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=oracle19cnoadg)(PORT=1521)))(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC1521)))
Services Summary...
Service "86b637b62fdf7a65e053f706e80a27ca" has 1 instance(s).Instance "prodpdb", status READY, has 1 handler(s) for this service...
Service "dd5eb78e33395714e0531f28a8c07bd2" has 1 instance(s).Instance "prodpdb", status READY, has 1 handler(s) for this service...
Service "dd6379106a279583e0531f28a8c06b78" has 1 instance(s).Instance "prodpdb", status READY, has 1 handler(s) for this service...
Service "pdb01" has 1 instance(s).Instance "prodpdb", status READY, has 1 handler(s) for this service...
Service "pdb02" has 1 instance(s).Instance "prodpdb", status READY, has 1 handler(s) for this service...
Service "prodpdb" has 1 instance(s).Instance "prodpdb", status READY, has 1 handler(s) for this service...
Service "prodpdbXDB" has 1 instance(s).Instance "prodpdb", status READY, has 1 handler(s) for this service...
The command completed successfully
[oracle@oracle19cnoadg ~]$ 创建DB LINK，并测试连通性
SQL> CREATE DATABASE LINK PDB01 CONNECT TO c##u1 IDENTIFIED BY tiger using 'PDB01';Database link created.SQL>
SQL> select * from dual@PDB01;D
-
XSQL> 6、创建手动模式刷新PDB
Create the manually refreshable PDB named cdb1_pdb1_ref
The following statement specifies the database link cdb1_datalink and the file destination /dsk1/df:
CREATE PLUGGABLE DATABASE cdb1_pdb1_ref FROM cdb1_pdb1@cdb1_datalink CREATE_FILE_DEST='/dsk1/df' REFRESH MODE MANUAL;SQL> CREATE PLUGGABLE DATABASE REFRESH_PDB FROM pdb01@PDB01 CREATE_FILE_DEST='/oracle/app/oradata/PRODPDB' REFRESH MODE MANUAL;Pluggable database created.SQL> 日志：
CREATE PLUGGABLE DATABASE REFRESH_PDB FROM pdb01@PDB01 CREATE_FILE_DEST='/oracle/app/oradata/PRODPDB' REFRESH MODE MANUAL
2022-04-27T11:33:28.147208+08:00
PDB01(3): AUDSYS.AUD$UNIFIED (SQL_TEXT) - CLOB populated
2022-04-27T11:33:32.713910+08:00
REFRESH_PDB(5):Endian type of dictionary set to little
****************************************************************
Pluggable Database REFRESH_PDB with pdb id - 5 is created as UNUSABLE.
If any errors are encountered before the pdb is marked as NEW,
then the pdb must be dropped
local undo-1, localundoscn-0x0000000000000118
****************************************************************
2022-04-27T11:33:34.805604+08:00
Applying media recovery for pdb-3 from SCN 3451756 to SCN 3451805
Remote log information: count-1
thr-1, seq-33, logfile-/oracle/app/fast_recovery_area/PRODPDB/foreign_archivelog/PDB01/2022_04_27/o1_mf_1_33_2753998305_.arc, los-3413276, nxs-18446744073709551615
REFRESH_PDB(5):Media Recovery Start
2022-04-27T11:33:34.832692+08:00
REFRESH_PDB(5):Serial Media Recovery started
REFRESH_PDB(5):max_pdb is 8
2022-04-27T11:33:35.062703+08:00
REFRESH_PDB(5):Media Recovery Log /oracle/app/fast_recovery_area/PRODPDB/foreign_archivelog/PDB01/2022_04_27/o1_mf_1_33_2753998305_.arc
2022-04-27T11:33:36.287440+08:00
REFRESH_PDB(5):Incomplete Recovery applied until change 3451805 time 04/27/2022 11:33:34
2022-04-27T11:33:36.304641+08:00
REFRESH_PDB(5):Media Recovery Complete (prodpdb)
2022-04-27T11:33:36.448659+08:00
Deleted Oracle managed file /oracle/app/fast_recovery_area/PRODPDB/foreign_archivelog/PDB01/2022_04_27/o1_mf_1_33_2753998305_.arc
Completed: CREATE PLUGGABLE DATABASE REFRESH_PDB FROM pdb01@PDB01 CREATE_FILE_DEST='/oracle/app/oradata/PRODPDB' REFRESH MODE MANUAL7、刷新PDB
Refresh cdb1_pdb1_ref:
ALTER SESSION SET CONTAINER = cdb1_pdb1_ref;
ALTER PLUGGABLE DATABASE REFRESH;SQL> ALTER SESSION SET CONTAINER = REFRESH_PDB;Session altered.SQL> ALTER PLUGGABLE DATABASE REFRESH;Pluggable database altered.SQL> 8、检查测试表T1的值
Query t1 to check that the refreshable clone PDB contains the correct contents (sample output included):
ALTER PLUGGABLE DATABASE OPEN READ ONLY;
SELECT * FROM t1;N1
----------1SQL> ALTER PLUGGABLE DATABASE REFRESH_PDB open read only ;Pluggable database altered.SQL> ALTER SESSION SET CONTAINER = REFRESH_PDB;Session altered.SQL> show con_nameCON_NAME
------------------------------
REFRESH_PDB
SQL> select * from t1;ID
----------1SQL> 可以通过下面的方式更新刷新方式
alter pluggable database refresh_pdb refresh mode manual;
alter pluggable database refresh_pdb refresh mode every 1 hours;
alter pluggable database refresh_pdb refresh mode every 1 minutes;
alter pluggable database refresh_pdb refresh mode none;查看PDB的刷新方式
SQL> col pdb_name for a30
SQL> select pdb_name, REFRESH_MODE,REFRESH_INTERVAL from dba_pdbs;PDB_NAME REFRES REFRESH_INTERVAL
------------------------------ ------ ----------------
PDB01 NONE
PDB$SEED NONE
REFRESH_PDB MANUAL
PDB02 NONESQL>
SQL> alter pluggable database refresh_pdb refresh mode every 1 minutes;Pluggable database altered.SQL> select pdb_name, REFRESH_MODE,REFRESH_INTERVAL from dba_pdbs;PDB_NAME REFRES REFRESH_INTERVAL
------------------------------ ------ ----------------
PDB01 NONE
PDB$SEED NONE
REFRESH_PDB AUTO 1
PDB02 NONESQL> 自动刷新的时候提示如下：
2022-04-27T11:43:49.574834+08:00
REFRESH_PDB(5):alter pluggable database refresh
REFRESH_PDB(5):REFRESH_PDB(5):ERROR:PDB needs to be closed for auto refresh
REFRESH_PDB(5):Completed: alter pluggable database refresh把PDB启动关闭，再次查看日志
REFRESH_PDB(5):alter pluggable database refresh
2022-04-27T11:46:52.850937+08:00
Applying media recovery for pdb-3 from SCN 3452320 to SCN 3452701
Remote log information: count-1
thr-1, seq-33, logfile-/oracle/app/fast_recovery_area/PRODPDB/foreign_archivelog/PDB01/2022_04_27/o1_mf_1_33_2753998305_.arc, los-3413276, nxs-18446744073709551615
REFRESH_PDB(5):Media Recovery Start
2022-04-27T11:46:52.860697+08:00
REFRESH_PDB(5):Serial Media Recovery started
REFRESH_PDB(5):max_pdb is 8
2022-04-27T11:46:52.917859+08:00
REFRESH_PDB(5):Media Recovery Log /oracle/app/fast_recovery_area/PRODPDB/foreign_archivelog/PDB01/2022_04_27/o1_mf_1_33_2753998305_.arc
2022-04-27T11:46:53.254925+08:00
REFRESH_PDB(5):Incomplete Recovery applied until change 3452701 time 04/27/2022 11:46:50
2022-04-27T11:46:53.259891+08:00
REFRESH_PDB(5):Media Recovery Complete (prodpdb)
2022-04-27T11:46:53.453766+08:00
Deleted Oracle managed file /oracle/app/fast_recovery_area/PRODPDB/foreign_archivelog/PDB01/2022_04_27/o1_mf_1_33_2753998305_.arc
REFRESH_PDB(5):Completed: alter pluggable database refresh验证数据
SQL> alter session set container=REFRESH_PDB;Session altered.SQL> alter database open read only;Database altered.SQL>
SQL> select * from t1;ID
----------12SQL> 9、激活PDB为read write模式. （这步也可以和源库PDB做switchover)
SQL> alter pluggable database REFRESH_PDB close immediate instances=all;Pluggable database altered.SQL> show pdbsCON_ID CON_NAME OPEN MODE RESTRICTED
---------- ------------------------------ ---------- ----------2 PDB$SEED READ ONLY NO3 PDB01 READ WRITE NO4 PDB02 MOUNTED5 REFRESH_PDB MOUNTED
SQL> alter pluggable database REFRESH_PDB refresh mode none;Pluggable database altered.SQL> show pdbsCON_ID CON_NAME OPEN MODE RESTRICTED
---------- ------------------------------ ---------- ----------2 PDB$SEED READ ONLY NO3 PDB01 READ WRITE NO4 PDB02 MOUNTED5 REFRESH_PDB MOUNTED
SQL> col pdb_name for a30
SQL> select pdb_name, REFRESH_MODE,REFRESH_INTERVAL from dba_pdbs;PDB_NAME REFRES REFRESH_INTERVAL
------------------------------ ------ ----------------
PDB01 NONE
PDB$SEED NONE
REFRESH_PDB NONE
PDB02 NONESQL>
SQL> alter pluggable database REFRESH_PDB open read write;Pluggable database altered.SQL> show pdbsCON_ID CON_NAME OPEN MODE RESTRICTED
---------- ------------------------------ ---------- ----------2 PDB$SEED READ ONLY NO3 PDB01 READ WRITE NO4 PDB02 MOUNTED5 REFRESH_PDB READ WRITE NO
SQL> alter session set container=REFRESH_PDB;Session altered.SQL> select * from t1;ID
----------12SQL> [2022-04-27] refresh PDB相关推荐
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