Oracle 12.2 新特性: Online PDB relocate (PDB hot move)
Oracle 12 . 2 新特性 : Online PDB relocate (PDB hot move)
Relocating a PDB 是 Oracle 在 12C 中推出的一種新的資料遷移方式，在採用 Relocate 時可以使用最短的停機時間在不同的 CDB 之間直接遷移 PDB 。
Oracle 12.1 中 Relocate 遷移資料時，需要源庫處於 read only 狀態，但由於 12.2 中 local undo 的推出，可以實現完全線上遷移，源庫的 PDB 在 read-write 模式下就可以 Relocate 到遠端 CDB 中， 源 PDB 中的 DML 事務不會受到任何影響 ，整個遷移過程中不需要匯出匯入後設資料，其遷移方式比 XTTS 更加簡單快捷。
在目標 PDB 執行“ create pluggable database xxx relocate ”完成後，源 CDB 和目標 CDB 會同時存在 2 個 Relocate PDB ，此時目標 CDB 中該 PDB 處於 MOUNT 狀態，而源庫的 PDB 仍然處於 READ WRITE 狀態。當在目標 CDB 中的 PDB 執行 OPEN 時，源 PDB 會停止且 Oracle 會自動 KILL 掉源 PDB 連線的所有會話，並同步且應用源 PDB 的日誌到目標 PDB ，同時也會回滾未提交的事務，應用完成後 源 PDB 庫的所有資料檔案將會自動刪除，源庫會被刪除 ，目標 PDB 可以對外提供服務。
如果在 Relocate 過程中使用 AVAILABILITY 模式進行 Relocate ，新的連線請求 Oracle 會將其傳送新 PDB 上，則完全實現 PDB 遷移的零停機。
其實 Relocate 的機制就是 Hot Clone+DBlink 的增量恢復。
PDB relocate 的基本實現方式 hot clone 和通過 dblink 的增量 redo apply 。線上 Pdb Relocate 需要在目標 CDB 中建立一個 database link 指向源庫的 CDB ，需要 DBLINK 使用的 common 使用者有 create pluggable database 的許可權， relocate 的 AVAILABILITY （高用選項）有 normal|max|high ，當目標庫使用 create pluggable database relocate 選項時，源庫會一直在 read-write open 狀態，甚至到 create pdb 的命令完成，源 PDB （ READ-WRITE OPEN ）上的使用者 DML 事務都不會有任何影響。當目標庫的 CREATE PDB RELOCATE 完成時，會在源 CDB 和目標 CDB 存在 2 個 relocate 的 PDB ，只不過在目標 CDB 中該 PDB 是 mount 狀態，此時源庫的 DML 為生成更多的 redo 日誌為後期的 PDB 切換， PDB 的切換操作是在目標 CDB 中的 PDB open read-write 時，此時源 PDB 會暫停，並且 KILL 掉源 PDB 庫連線的會話，同步並應用源庫 PDB 的 redo 到目標 PDB ，並且應用 undo 資料回滾未提交的事務，當應用完成後源 pdb 庫的所有資料檔案將會自動刪除，目標 PDB 事務繼續，在這短暫的操作期間如果使用 AVAILABILITY 如果有新的連線請求， Oracle 可以跳過連線到新 PDB 上，實現了移動 PDB 的零停機。
有一些基本的條件如源庫和目標庫是 archivelog mode, 並且 local undo ，和相同的位元組碼（ endianness ），相同的 options 和字符集或者目標庫是源庫的子集，如目標庫是字符集是 AL32UTF8 ，源庫可以是任何字符集，當然這也是 12.2 的另一新特性 ( 同一 CDB 中，不同的 PDB 可以使用不同的字符集，但是其限制是 CDB 必須是 AL32UTF8) 。
Relocate a PDB
Relocate a PDB Into an Application Container
在使用 RelocatePDB 進行資料遷移時需要注意如下事項：
1. 如果 PDB 被 Relocate 到的 CDB 的字符集不是 AL32UTF8 ，那麼源與目標字符集必須相容。
2. 源端與目標端的位元組順序必須相同。
3. 連線的使用者在 CDB 中必須擁有 'CREATE PLUGGABLE DATABASE' 的許可權。
5. 源端 PDB 必須為歸檔模式。
6. 源端 PDB 必須是 local undo 模式。
7. 當指定 AVAILABILITY MAX 子句時，要求目標 PDB 與源 PDB 名字必須保持一致。
實驗時使用 12.2.0.2 測試，或同版本測試：
alter pluggable database PDBLHR1 close; drop pluggable database PDBLHR1 including datafiles; --源庫 grant connect, sysoper, create pluggable database to SYSTEM container=all; --這裡的DBLINK是連線到源庫的CDB，而非PDB create public database link dbl_CDBLHR1 connect to system identified by lhr using 'CDBLHR1'; create public database link dbl_CDBLHR1 connect to system identified by lhr using '(DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.59.52)(PORT = 1521)) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = lhr18cdb)))'; create pluggable database PDBRELOCATE from PDBLHR2@dbl_CDBLHR1 relocate CREATE_FILE_DEST = '/u01/app/oracle/oradata'; alter pluggable database PDBRELOCATE open; show pdbs SELECT to_char(time, 'YYYY-MM-DD HH24:MI:SS') time, NAME, CAUSE, TYPE, LINE, MESSAGE, STATUS, ACTION, CON_ID FROM PDB_PLUG_IN_VIOLATIONS order by time desc;
源庫的告警日誌：
2018-12-04T14:05:32.210947+08:00
PDBLHR2(4):JIT: pid 5065 requesting stop
Pluggable database PDBLHR2 closed
PDBLHR2(4):JIT: pid 5065 requesting stop
PDBLHR2(4):Buffer Cache flush started: 4
PDBLHR2(4):Buffer Cache flush finished: 4
2018-12-04T14:05:32.768297+08:00
PDBLHR2(4):While transitioning the pdb 4 to clean state, clearing all its abort bits in the control file.
Pluggable database PDBLHR2 closed
2018-12-04T14:05:40.727737+08:00
Deleted Oracle managed file +DATA/LHR18CDB/78CAF704CB8846B6E0550250563FC469/TEMPFILE/temp.281.990191125
Deleted Oracle managed file +DATA/LHR18CDB/78CAF704CB8846B6E0550250563FC469/DATAFILE/undotbs1.278.990190699
Deleted Oracle managed file +DATA/LHR18CDB/78CAF704CB8846B6E0550250563FC469/DATAFILE/sysaux.280.990190707
Deleted Oracle managed file +DATA/LHR18CDB/78CAF704CB8846B6E0550250563FC469/DATAFILE/system.279.990190701
目標庫的告警日誌：
2018-12-04T13:59:54.065377+08:00
create pluggable database PDBRELOCATE from PDBLHR2@dbl_CDBLHR1 relocate CREATE_FILE_DEST = '/u01/app/oracle/oradata'
2018-12-04T13:59:56.696932+08:00
**************************************************************
Undo Create of Pluggable Database PDBRELOCATE with pdb id - 4.
**************************************************************
ORA-17628 signalled during: create pluggable database PDBRELOCATE from PDBLHR2@dbl_CDBLHR1 relocate CREATE_FILE_DEST = '/u01/app/oracle/oradata'...
2018-12-04T14:00:17.018600+08:00
Resize operation completed for file# 3, old size 532480K, new size 542720K
2018-12-04T14:02:27.106990+08:00
create pluggable database PDBRELOCATE from PDBLHR2@dbl_CDBLHR1 relocate CREATE_FILE_DEST = '/u01/app/oracle/oradata'
2018-12-04T14:02:44.901996+08:00
PDBRELOCATE(5):Endian type of dictionary set to little
****************************************************************
Pluggable Database PDBRELOCATE 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-0x0000000000000103
****************************************************************
2018-12-04T14:02:49.576748+08:00
Applying media recovery for pdb-4099 from SCN 1872606 to SCN 1872624
Remote log information: count-1
thr-1, seq-8, logfile-+FRA/LHR18CDB/partial_archivelog/2018_12_04/thread_1_seq_8.260.993996167, los-1864077, nxs-18446744073709551615
PDBRELOCATE(5):Media Recovery Start
2018-12-04T14:02:49.583591+08:00
PDBRELOCATE(5):Serial Media Recovery started
PDBRELOCATE(5):max_pdb is 5
2018-12-04T14:02:49.654294+08:00
PDBRELOCATE(5):Media Recovery Log +FRA/LHR18CDB/partial_archivelog/2018_12_04/thread_1_seq_8.260.993996167
2018-12-04T14:02:51.341131+08:00
PDBRELOCATE(5):Incomplete Recovery applied until change 1872624 time 12/04/2018 14:02:45
2018-12-04T14:02:51.345366+08:00
PDBRELOCATE(5):Media Recovery Complete (CDBLHR18c)
Completed: create pluggable database PDBRELOCATE from PDBLHR2@dbl_CDBLHR1 relocate CREATE_FILE_DEST = '/u01/app/oracle/oradata'
2018-12-04T14:05:23.994157+08:00
alter pluggable database PDBRELOCATE open
2018-12-04T14:05:28.606877+08:00
Applying media recovery for pdb-4099 from SCN 1872624 to SCN 1873690
Remote log information: count-1
thr-1, seq-8, logfile-+FRA/LHR18CDB/partial_archivelog/2018_12_04/thread_1_seq_8.261.993996327, los-1864077, nxs-18446744073709551615
PDBRELOCATE(5):Media Recovery Start
2018-12-04T14:05:28.607442+08:00
PDBRELOCATE(5):Serial Media Recovery started
PDBRELOCATE(5):max_pdb is 5
2018-12-04T14:05:28.655007+08:00
PDBRELOCATE(5):Media Recovery Log +FRA/LHR18CDB/partial_archivelog/2018_12_04/thread_1_seq_8.261.993996327
2018-12-04T14:05:31.068791+08:00
PDBRELOCATE(5):Incomplete Recovery applied until change 1873690 time 12/04/2018 14:05:24
2018-12-04T14:05:31.071574+08:00
PDBRELOCATE(5):Media Recovery Complete (CDBLHR18c)
PDBRELOCATE(5):Autotune of undo retention is turned on.
PDBRELOCATE(5):Undo initialization finished serial:0 start:20396712 end:20396712 diff:0 ms (0.0 seconds)
PDBRELOCATE(5):Database Characterset for PDBRELOCATE is AL32UTF8
PDBRELOCATE(5):Opening pdb with no Resource Manager plan active
2018-12-04T14:05:32.213689+08:00
PDBRELOCATE(5):JIT: pid 62503 requesting stop
PDBRELOCATE(5):Buffer Cache flush started: 5
PDBRELOCATE(5):Buffer Cache flush finished: 5
2018-12-04T14:05:37.321967+08:00
Applying media recovery for pdb-4099 from SCN 1873690 to SCN 1873744
Remote log information: count-1
thr-1, seq-8, logfile-+FRA/LHR18CDB/partial_archivelog/2018_12_04/thread_1_seq_8.262.993996335, los-1864077, nxs-18446744073709551615
PDBRELOCATE(5):Media Recovery Start
2018-12-04T14:05:37.322339+08:00
PDBRELOCATE(5):Serial Media Recovery started
PDBRELOCATE(5):max_pdb is 5
2018-12-04T14:05:37.356870+08:00
PDBRELOCATE(5):Media Recovery Log +FRA/LHR18CDB/partial_archivelog/2018_12_04/thread_1_seq_8.262.993996335
2018-12-04T14:05:38.978984+08:00
PDBRELOCATE(5):Incomplete Recovery applied until change 1873744 time 12/04/2018 14:05:32
2018-12-04T14:05:38.981093+08:00
PDBRELOCATE(5):Media Recovery Complete (CDBLHR18c)
PDBRELOCATE(5):Undo initialization recovery: err:0 start: 20404280 end: 20404284 diff: 4 ms (0.0 seconds)
PDBRELOCATE(5):[62503] Successfully onlined Undo Tablespace 2.
PDBRELOCATE(5):Undo initialization online undo segments: err:0 start: 20404284 end: 20404289 diff: 5 ms (0.0 seconds)
PDBRELOCATE(5):Undo initialization finished serial:0 start:20404280 end:20404290 diff:10 ms (0.0 seconds)
PDBRELOCATE(5):Database Characterset for PDBRELOCATE is AL32UTF8
PDBRELOCATE(5):Buffer Cache flush started: 5
PDBRELOCATE(5):Buffer Cache flush finished: 5
2018-12-04T14:05:39.056929+08:00
PDBRELOCATE(5):While transitioning the pdb 5 to clean state, clearing all its abort bits in the control file.
2018-12-04T14:05:41.205276+08:00
PDBRELOCATE(5):Undo initialization recovery: err:0 start: 20406479 end: 20406480 diff: 1 ms (0.0 seconds)
PDBRELOCATE(5):[62503] Successfully onlined Undo Tablespace 2.
PDBRELOCATE(5):Undo initialization online undo segments: err:0 start: 20406480 end: 20406518 diff: 38 ms (0.0 seconds)
PDBRELOCATE(5):Undo initialization finished serial:0 start:20406479 end:20406519 diff:40 ms (0.0 seconds)
PDBRELOCATE(5):Deleting old file#12 from file$
PDBRELOCATE(5):Deleting old file#13 from file$
PDBRELOCATE(5):Deleting old file#14 from file$
PDBRELOCATE(5):Adding new file#12 to file$(old file#12). fopr-1, newblks-34560, oldblks-19200
PDBRELOCATE(5):Adding new file#13 to file$(old file#13). fopr-1, newblks-47360, oldblks-15360
PDBRELOCATE(5):Adding new file#14 to file$(old file#14). fopr-1, newblks-12800, oldblks-12800
PDBRELOCATE(5):Successfully created internal service PDBRELOCATE at open
****************************************************************
Post plug operations are now complete.
Pluggable database PDBRELOCATE with pdb id - 5 is now marked as NEW.
****************************************************************
PDBRELOCATE(5):Pluggable database PDBRELOCATE dictionary check beginning
PDBRELOCATE(5):Pluggable Database PDBRELOCATE Dictionary check complete
PDBRELOCATE(5):Database Characterset for PDBRELOCATE is AL32UTF8
Violations: Type: 2, Count: 3
PDBRELOCATE(5):***************************************************************
PDBRELOCATE(5):WARNING: Pluggable Database PDBRELOCATE with pdb id - 5 is
PDBRELOCATE(5): altered with errors or warnings. Please look into
PDBRELOCATE(5): PDB_PLUG_IN_VIOLATIONS view for more details.
PDBRELOCATE(5):***************************************************************
2018-12-04T14:05:42.403987+08:00
PDBRELOCATE(5):Opening pdb with no Resource Manager plan active
Pluggable database PDBRELOCATE opened read write
Completed: alter pluggable database PDBRELOCATE open
下面開始演示, 因為測試12c 的環境成本增高，測試環境是我和朋友的兩臺筆記本之間不同CDB之間的relocate, oracle 12.2 ee on OL6, 遷移源庫ORCL122的PDB：test到目標庫ANBOB中
源庫CDB中建立COMMON使用者用於dblink
SQL> create user C##CLONE_ADMIN identified by oracle container=all; User created. SQL> grant connect, sysoper, create pluggable databaseto C##CLONE_ADMIN container=all; Grant succeeded.
目標庫配置tnsnames.ora並建立DBLINK
# tnsnames.ora append cdb210 = (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.31.210)(PORT = 1521)) (LOAD_BALANCE = NO) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = ORCL122) ) ) [oracle@anbob ~]$ tnsping cdb210 TNS Ping Utility for Linux: Vesion 12.2.0.1.0 - Production on 12-MAR-2017 12:07:24 Copyright (c) 1997, 2016, Oracle. All rights reserved. Used parameter files: /u02/app/oracle/product/12.2.0/db_1/network/admin/sqlnet.ora Used TNSNAMES adapter to resolve the alias Attempting to contact (DESCRIPTION = (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.31.210)(PORT = 1521)) (LOAD_BALANCE = NO) (CONNECT_DATA = (SERVER = DEDICATED) (SERVICE_NAME = ORCL122))) OK (0 msec) SQL> create database link link_cdb210 connect to C##CLONE_ADMIN identified by oracle using 'cdb210'; Database link created. SQL> select sysdate from dual@link_cdb210; SYSDATE ------------------- 2017-03-12 12:20:38
源庫和目標庫的相容性檢查
# target db
[oracle@anbob admin]$ ora
SQL*Plus: Release 12.2.0.1.0 Production on Sun Mar 12 11:48:05 2017
Copyright (c) 1982, 2016, Oracle. All rights reserved.
Connected to:
Oracle Database 12c EE Extreme Perf Release 12.2.0.1.0 - 64bit Production
USERNAME INST_NAME HOST_NAME SID SERIAL# VERSION STARTED SPID OPID CPID SADDR PADDR
-------------------- -------------------- ------------------------- ----- -------- ---------- -------- ---------- ----- --------------- ---------------- ----------------
SYS CDB$ROOT-anbob anbob 53 20573 12.2.0.1.0 20170312 5029 33 5028 000000006B23A690 000000006CC27FC8
SQL> archive log list
Database log mode Archive Mode
Automatic archival Enabled
Archive destination /u02/app/oracle/product/12.2.0/db_1/dbs/arch
Oldest online log sequence 13
Next log sequence to archive 15
Current log sequence 15
col PROPERTY_NAME for a30
col PROPERTY_VALUE for a40
SELECT PROPERTY_NAME, PROPERTY_VALUE FROM DATABASE_PROPERTIES WHERE PROPERTY_NAME in('LOCAL_UNDO_ENABLED','DICTIONARY_ENDIAN_TYPE','GLOBAL_DB_NAME','NLS_CHARACTERSET');
PROPERTY_NAME PROPERTY_VALUE
------------------------------ ----------------------------------------
DICTIONARY_ENDIAN_TYPE LITTLE
LOCAL_UNDO_ENABLED TRUE
GLOBAL_DB_NAME ANBOB.COM
NLS_CHARACTERSET AL32UTF8
SQL> select
db.name,
db.platform_id,
db.platform_name ,
os.ENDIAN_FORMAT
from
v$database db ,v$transportable_platform os
where db.platform_id=os.platform_id;
NAME PLATFORM_ID PLATFORM_NAME ENDIAN_FORMAT
--------- ----------- ------------------------------ --------------
ANBOB 13 Linux x86 64-bit Little
SQL> select * from v$option where value='TRUE';
PARAMETER VALUE CON_ID
---------------------------------------- ---------- ----------
Partitioning TRUE 0
Objects TRUE 0
Advanced replication TRUE 0
Bit-mapped indexes TRUE 0
Connection multiplexing TRUE 0
Connection pooling TRUE 0
Database queuing TRUE 0
Incremental backup and recovery TRUE 0
Instead-of triggers TRUE 0
Parallel backup and recovery TRUE 0
Parallel execution TRUE 0
Parallel load TRUE 0
Point-in-time tablespace recovery TRUE 0
Fine-grained access control TRUE 0
Proxy authentication/authorization TRUE 0
Change Data Capture TRUE 0
Plan Stability TRUE 0
Online Index Build TRUE 0
Coalesce Index TRUE 0
Managed Standby TRUE 0
Materialized view rewrite TRUE 0
Database resource manager TRUE 0
Spatial TRUE 0
Export transportable tablespaces TRUE 0
Transparent Application Failover TRUE 0
Fast-Start Fault Recovery TRUE 0
Sample Scan TRUE 0
Duplexed backups TRUE 0
Java TRUE 0
OLAP Window Functions TRUE 0
Block Media Recovery TRUE 0
Fine-grained Auditing TRUE 0
Application Role TRUE 0
Enterprise User Security TRUE 0
Oracle Data Guard TRUE 0
OLAP TRUE 0
Basic Compression TRUE 0
Join index TRUE 0
Trial Recovery TRUE 0
Advanced Analytics TRUE 0
Online Redefinition TRUE 0
Streams Capture TRUE 0
File Mapping TRUE 0
Block Change Tracking TRUE 0
Flashback Table TRUE 0
Flashback Database TRUE 0
Transparent Data Encryption TRUE 0
Backup Encryption TRUE 0
Unused Block Compression TRUE 0
Result Cache TRUE 0
SQL Plan Management TRUE 0
SecureFiles Encryption TRUE 0
Real Application Testing TRUE 0
Flashback Data Archive TRUE 0
DICOM TRUE 0
Active Data Guard TRUE 0
Server Flash Cache TRUE 0
Advanced Compression TRUE 0
XStream TRUE 0
Deferred Segment Creation TRUE 0
Exadata Discovery TRUE 0
Data Mining TRUE 0
Global Data Services TRUE 0
Adaptive Execution Plans TRUE 0
Table Clustering TRUE 0
Zone Maps TRUE 0
Real Application Security TRUE 0
Privilege Analysis TRUE 0
Data Redaction TRUE 0
Cross Transportable Backups TRUE 0
Cache Fusion Lock Accelerator TRUE 0
Snapshot time recovery TRUE 0
Heat Map TRUE 0
Automatic Data Optimization TRUE 0
Transparent Sensitive Data Protection TRUE 0
In-Memory Column Store TRUE 0
Advanced Index Compression TRUE 0
In-Memory Aggregation TRUE 0
78 rows selected.
# source db
[oracle@db1 ~]$ sqlplus / as sysdba
SQL*Plus: Release 12.2.0.1.0 Production on Sun Mar 12 12:13:27 2017
Copyright (c) 1982, 2016, Oracle. All rights reserved.
Connected to:
Oracle Database 12c Enterprise Edition Release 12.2.0.1.0 - 64bit Production
SQL> archive log list
Database log mode Archive Mode
Automatic archival Enabled
Archive destination /arch
Oldest online log sequence 156
Next log sequence to archive 158
Current log sequence 158
SQL> col PROPERTY_NAME for a30
SQL> col PROPERTY_VALUE for a40
SQL> SELECT PROPERTY_NAME, PROPERTY_VALUE FROM DATABASE_PROPERTIES WHERE PROPERTY_NAME in('LOCAL_UNDO_ENABLED','DICTIONARY_ENDIAN_TYPE','GLOBAL_DB_NAME','NLS_CHARACTERSET');
PROPERTY_NAME PROPERTY_VALUE
------------------------------ ----------------------------------------
DICTIONARY_ENDIAN_TYPE LITTLE
LOCAL_UNDO_ENABLED TRUE
GLOBAL_DB_NAME ORCL122
NLS_CHARACTERSET ZHS16GBK
SQL> select
2 db.name,
3 db.platform_id,
4 db.platform_name ,
5 os.ENDIAN_FORMAT
6 from
7 v$database db ,v$transportable_platform os
8 where db.platform_id=os.platform_id;
NAME PLATFORM_ID PLATFORM_NAME ENDIAN_FORMAT
--------- ----------- -------------------------------- --------------
ORCL122 13 Linux x86 64-bit Little
SQL> select * from v$option where value='TRUE';
PARAMETER VALUE CON_ID
---------------------------------------------------------------- --------------- ----------
Partitioning TRUE 0
Objects TRUE 0
Advanced replication TRUE 0
Bit-mapped indexes TRUE 0
Connection multiplexing TRUE 0
Connection pooling TRUE 0
Database queuing TRUE 0
Incremental backup and recovery TRUE 0
Instead-of triggers TRUE 0
Parallel backup and recovery TRUE 0
Parallel execution TRUE 0
Parallel load TRUE 0
Point-in-time tablespace recovery TRUE 0
Fine-grained access control TRUE 0
Proxy authentication/authorization TRUE 0
Change Data Capture TRUE 0
Plan Stability TRUE 0
Online Index Build TRUE 0
Coalesce Index TRUE 0
Managed Standby TRUE 0
Materialized view rewrite TRUE 0
Database resource manager TRUE 0
Spatial TRUE 0
Export transportable tablespaces TRUE 0
Transparent Application Failover TRUE 0
Fast-Start Fault Recovery TRUE 0
Sample Scan TRUE 0
Duplexed backups TRUE 0
Java TRUE 0
OLAP Window Functions TRUE 0
Block Media Recovery TRUE 0
Fine-grained Auditing TRUE 0
Application Role TRUE 0
Enterprise User Security TRUE 0
Oracle Data Guard TRUE 0
OLAP TRUE 0
Basic Compression TRUE 0
Join index TRUE 0
Trial Recovery TRUE 0
Advanced Analytics TRUE 0
Online Redefinition TRUE 0
Streams Capture TRUE 0
File Mapping TRUE 0
Block Change Tracking TRUE 0
Flashback Table TRUE 0
Flashback Database TRUE 0
Transparent Data Encryption TRUE 0
Backup Encryption TRUE 0
Unused Block Compression TRUE 0
Result Cache TRUE 0
SQL Plan Management TRUE 0
SecureFiles Encryption TRUE 0
Real Application Testing TRUE 0
Flashback Data Archive TRUE 0
DICOM TRUE 0
Active Data Guard TRUE 0
Server Flash Cache TRUE 0
Advanced Compression TRUE 0
XStream TRUE 0
Deferred Segment Creation TRUE 0
Exadata Discovery TRUE 0
Data Mining TRUE 0
Global Data Services TRUE 0
Adaptive Execution Plans TRUE 0
Table Clustering TRUE 0
Zone Maps TRUE 0
Real Application Security TRUE 0
Privilege Analysis TRUE 0
Data Redaction TRUE 0
Cross Transportable Backups TRUE 0
Cache Fusion Lock Accelerator TRUE 0
Snapshot time recovery TRUE 0
Heat Map TRUE 0
Automatic Data Optimization TRUE 0
Transparent Sensitive Data Protection TRUE 0
In-Memory Column Store TRUE 0
Advanced Index Compression TRUE 0
In-Memory Aggregation TRUE 0
78 rows selected.
SQL> show pdbs
CON_ID CON_NAME OPEN MODE RESTRICTED
---------- ------------------------------ ---------- ----------
2 PDB$SEED READ ONLY NO
3 FAN MOUNTED
4 TEST2 MOUNTED
6 TEST READ WRITE NO
SQL> alter session set container=test;
Session altered.
SQL> select name from v$datafile;
NAME
-------------------------------------------------------------------------------------------------------
/oracle/app/oracle/oradata/ORCL122/492D54D080AD4990E053D238A8C08E62/datafile/o1_mf_system_dbz88noo_.dbf
/oracle/app/oracle/oradata/ORCL122/492D54D080AD4990E053D238A8C08E62/datafile/o1_mf_sysaux_dbz88noz_.dbf
/oracle/app/oracle/oradata/ORCL122/492D54D080AD4990E053D238A8C08E62/datafile/o1_mf_users_dbz88np1_.dbf
/oracle/app/oracle/oradata/ORCL122/492D54D080AD4990E053D238A8C08E62/datafile/o1_mf_undo_dbz88np1_.dbf
目標庫中開始relocate pdb :test, 注意這段期間我們在用java應用不停在向源庫PDB中做INSERT，確認對事務並無影響。
SQL> create pluggable database pdbtest from test@link_cdb210 relocate;
create pluggable database pdbtest from test@link_cdb210 relocate
*
ERROR at line 1:
ORA-65016: FILE_NAME_CONVERT must be specified
SQL> alter session set pdb_file_name_convert='/oracle/app/oracle/oradata/ORCL122/492D54D080AD4990E053D238A8C08E62/datafile','pdbtest';
Session altered.
SQL> show parameter create
PARAMETER_NAME TYPE VALUE
------------------------------------------------------------ ----------- ----------------------------------------------------------------------------------------------------
create_bitmap_area_size integer 8388608
create_stored_outlines string
db_create_file_dest string
db_create_online_log_dest_1 string
db_create_online_log_dest_2 string
db_create_online_log_dest_3 string
db_create_online_log_dest_4 string
db_create_online_log_dest_5 string
SQL> create pluggable database pdbtest from test@link_cdb210 relocate;
create pluggable database pdbtest from test@link_cdb210 relocate
*
ERROR at line 1:
ORA-65005: missing or invalid file name pattern for file - /oracle/app/oracle/oradata/ORCL122/492D54D080AD4990E053D238A8C08E62/datafile/o1_mf_system_dbz88noo_.dbf
SQL> @ls users
TABLESPACE_NAME FILE_ID FILE_NAME EXT MB MAXSZ
------------------------------ ---------- -------------------------------------------------------------------------------- --- ---------- ----------
USERS 7 /u02/app/oracle/oradata/anbob/users01.dbf YES 5 32767.98
SQL> host
[oracle@anbob scripts]$ mkdir -p /u02/app/oracle/oradata/pdbtest
[oracle@anbob scripts]$ exit
exit
SQL> create pluggable database pdbtest from test@link_cdb210 relocate FILE_NAME_CONVERT=('/oracle/app/oracle/oradata/ORCL122/492D54D080AD4990E053D238A8C08E62/datafile','/u02/app/oracle/oradata/pdbtest');
create pluggable database pdbtest from test@link_cdb210 relocate FILE_NAME_CONVERT=('/oracle/app/oracle/oradata/ORCL122/492D54D080AD4990E053D238A8C08E62/datafile','/u02/app/oracle/oradata/pdbtest')
*
ERROR at line 1:
ORA-01276: Cannot add file /u02/app/oracle/oradata/pdbtest/o1_mf_system_dbz88noo_.dbf. File has an Oracle Managed Files file name.
SQL> alter session set pdb_file_name_convert='/oracle/app/oracle/oradata/ORCL122/492D54D080AD4990E053D238A8C08E62/datafile','/u02/app/oracle/oradata/pdbtest';
Session altered.
SQL> create pluggable database pdbtest from test@link_cdb210 relocate;
create pluggable database pdbtest from test@link_cdb210 relocate
*
ERROR at line 1:
ORA-01276: Cannot add file /u02/app/oracle/oradata/pdbtest/o1_mf_system_dbz88noo_.dbf. File has an Oracle Managed Files file name.
SQL> create pluggable database pdbtest from test@link_cdb210 relocate PATH_PREFIX ='/u02/app/oracle/oradata/pdbtest';
create pluggable database pdbtest from test@link_cdb210 relocate PATH_PREFIX ='/u02/app/oracle/oradata/pdbtest'
*
ERROR at line 1:
ORA-01276: Cannot add file /u02/app/oracle/oradata/pdbtest/o1_mf_system_dbz88noo_.dbf. File has an Oracle Managed Files file name.
SQL> ho oerr ora 1276
01276, 00000, "Cannot add file %s. File has an Oracle Managed Files file name."
// *Cause: An attempt was made to add to the database a datafile, log file,
// control file, snapshot control file, backup control file,
// datafile copy, control file copy or backuppiece with an Oracle
// Managed Files file name.
// *Action: Retry the operation with a new file name.
SQL> alter session set db_create_file_dest='/u02/app/oracle/oradata';
Session altered.
SQL> create pluggable database pdbtest from test@link_cdb210 relocate;
Pluggable database created.
SQL> show pdbs
CON_ID CON_NAME OPEN MODE RESTRICTED
---------- ------------------------------ ---------- ----------
2 PDB$SEED READ ONLY NO
3 PDBANBOB MOUNTED
4 PDBTEST MOUNTED ######
6 PDBWEEJAR MOUNTED
SQL> select pdb_name, status from cdb_pdbs;
PDB_NAME STATUS
------------------------------ ----------
PDBANBOB NORMAL
PDB$SEED NORMAL
PDBWEEJAR NORMAL
PDBTEST RELOCATING #######
[oracle@anbob oradata]$ ls -lrt
total 20
drwxr-x--- 3 oracle oinstall 4096 Mar 6 17:14 weejar
drwxr-x--- 3 oracle oinstall 4096 Mar 8 17:16 weejar_img
drwxr-x--- 5 oracle oinstall 4096 Mar 9 20:51 anbob
drwxr-x--- 3 oracle oinstall 4096 Mar 12 12:40 ANBOB
[oracle@anbob ANBOB]$ ls
492D54D080AD4990E053D238A8C08E62
[oracle@anbob ANBOB]$ cd 492D54D080AD4990E053D238A8C08E62/
[oracle@anbob 492D54D080AD4990E053D238A8C08E62]$ ls
datafile
[oracle@anbob 492D54D080AD4990E053D238A8C08E62]$ cd datafile/
[oracle@anbob datafile]$ ls -lrt
total 556064
-rw-r----- 1 oracle oinstall 52436992 Mar 12 12:41 o1_mf_users_dd9n9byf_.dbf
-rw-r----- 1 oracle oinstall 52436992 Mar 12 12:41 o1_mf_undo_dd9n9byg_.dbf
-rw-r----- 1 oracle oinstall 241180672 Mar 12 12:46 o1_mf_sysaux_dd9n9byd_.dbf
-rw-r----- 1 oracle oinstall 225452032 Mar 12 12:47 o1_mf_system_dd9n9by2_.dbf
Note:
如果源庫使用了OMF格式的檔名，目標庫無法使用convert轉換，只能配置db_create_file_dest同樣對於該PDB使用OMF。PDB建立成功後是MOUNT格式，此時源庫的DML事務並沒有影響。同時檢視PDBTEST的狀態為
RELOCATING
， 同時監聽上已註冊了pdbanbob的service。
# source db
SQL> select pdb_name, status from cdb_pdbs; PDB_NAME STATUS ----------------------------- ---------- TEST NORMAL SQL> show pdbs CON_ID CON_NAME OPEN MODE RESTRICTED ---------- ------------------------------ ---------- ---------- 6 TEST READ WRITE NO
以上操作目標庫ALERT LOG日誌
2017-03-12 12:40:08.012000 +08:00 create pluggable database pdbtest from test@link_cdb210 relocate 2017-03-12 12:40:10.952000 +08:00 Opatch validation is skipped for PDB PDBTEST (con_id=4) 2017-03-12 12:47:08.169000 +08:00 Endian type of dictionary set to little **************************************************************** Pluggable Database PDBTEST with pdb id - 4 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-0x0000000000164856 **************************************************************** 2017-03-12 12:47:11.075000 +08:00 Applying media recovery for pdb-4099 from SCN 3296978 to SCN 3298748 Remote log information: count-1 thr-1, seq-158, logfile-/arch/parlog_1_158_ea6c4617_936609332.arc, los-2479672, nxs-18446744073709551615 Media Recovery Start Serial Media Recovery started Media Recovery Log /arch/parlog_1_158_ea6c4617_936609332.arc ##### 路徑是源庫 2017-03-12 12:47:40.825000 +08:00 Incomplete Recovery applied until change 3298748 time 03/12/2017 12:47:06 Media Recovery Complete (anbob) Completed: create pluggable database pdbtest from test@link_cdb210 relocate
在目標CDB中開啟PDB，實際的PDB切換操作
SQL> alter pluggable database pdbtest open; Pluggable database altered. SQL> select pdb_name, status from cdb_pdbs; PDB_NAME STATUS -------------------------------------------- ---------- PDBANBOB NORMAL PDB$SEED NORMAL PDBWEEJAR NORMAL PDBTEST NORMAL SQL> alter session set container=pdbtest; Session altered. SQL> @tab test.t Show tables matching condition "%test.t%" (if schema is not specified then current user s tables only are shown)... OWNER TABLE_NAME TYPE NUM_ROWS BLOCKS EMPTY AVGSPC ROWLEN TAB_LAST_ANALYZED DEGREE COMPRESS -------------------- ------------------------------ ---- ------------ ------------- --------- ------ ------ ------------------- -------------------- -------- TEST T TAB 4238 20 0 0 19 2017-03-12 12:58:04 1 DISABLED SQL> @desc test.t Name Null? Type ------------------------------- -------- ---------------------------- 1 STR VARCHAR2(100) 2 INTIME DATE SQL> select max(intime) from test.t; MAX(INTIME) ------------------- 2017-03-12 12:58:57 SQL> select count(*) from test.t where str='jdbc'; COUNT(*) ---------- 2146 # 測試向源庫insert 的java 程式日誌 ... 2145:2017-03-12 12:58:59 2146:2017-03-12 12:59:00 insert end java.sql.SQLRecoverableException: 無法從套接字讀取更多的資料 at oracle.jdbc.driver.T4CMAREngine.unmarshalUB1(T4CMAREngine.java:1157) at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:350) at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:227) at oracle.jdbc.driver.T4C7Ocommoncall.doOCOMMIT(T4C7Ocommoncall.java:75) at oracle.jdbc.driver.T4CConnection.doCommit(T4CConnection.java:641)
Note:
目標CDB中的relocate pdb開啟時，源庫之前的INSERT會話補KILL, 因為測試的應用只配置了到源庫的連線，所以insert 被中斷，同時驗證了資料在源庫的記錄條數和目標端一致。 且源庫的PDB TEST已自動刪除。 目標庫的PDBtest可以正常操作。
目標庫對應的ALERT LOG
2017-03-12 12:58:36.324000 +08:00 alter pluggable database pdbtest open 2017-03-12 12:58:37.901000 +08:00 Applying media recovery for pdb-4099 from SCN 3298748 to SCN 3303755 Remote log information: count-2 thr-1, seq-158, logfile-/arch/9b87b4_1_158_936609332.dbf, los-2479672, nxs-3301888 thr-1, seq-159, logfile-/arch/parlog_1_159_ea6c4617_936609332.arc, los-3301888, nxs-18446744073709551615 Media Recovery Start Serial Media Recovery started Media Recovery Log /arch/9b87b4_1_158_936609332.dbf 2017-03-12 12:58:52.959000 +08:00 Media Recovery Log /arch/parlog_1_159_ea6c4617_936609332.arc 2017-03-12 12:58:59.102000 +08:00 Incomplete Recovery applied until change 3303755 time 03/12/2017 12:58:34 Media Recovery Complete (anbob) Autotune of undo retention is turned on. Undo initialization finished serial:0 start:6848016 end:6848016 diff:0 ms (0.0 seconds) Opatch validation is skipped for PDB PDBTEST (con_id=0) *************************************************************** WARNING: Pluggable Database PDBTEST with pdb id - 4 is altered with errors or warnings. Please look into PDB_PLUG_IN_VIOLATIONS view for more details. *************************************************************** 2017-03-12 12:59:00.330000 +08:00 Opening pdb with no Resource Manager plan active 2017-03-12 12:59:04.586000 +08:00 JIT: pid 5236 requesting stop 2017-03-12 12:59:10.993000 +08:00 Applying media recovery for pdb-4099 from SCN 3303755 to SCN 3304167 Remote log information: count-1 thr-1, seq-159, logfile-/arch/parlog_1_159_ea6c4617_936609332.arc, los-3301888, nxs-18446744073709551615 Media Recovery Start Serial Media Recovery started Media Recovery Log /arch/parlog_1_159_ea6c4617_936609332.arc 2017-03-12 12:59:14.011000 +08:00 Incomplete Recovery applied until change 3304167 time 03/12/2017 12:59:05 Media Recovery Complete (anbob) [5236] Successfully onlined Undo Tablespace 5. Undo initialization finished serial:0 start:6862572 end:6862668 diff:96 ms (0.1 seconds) Database Characterset for PDBTEST is ZHS16GBK 2017-03-12 12:59:15.870000 +08:00 [5236] Successfully onlined Undo Tablespace 5. Undo initialization finished serial:0 start:6864208 end:6864295 diff:87 ms (0.1 seconds) Opatch validation is skipped for PDB PDBTEST (con_id=4) Deleting old file#29 from file$ Deleting old file#30 from file$ Deleting old file#31 from file$ Deleting old file#32 from file$ Adding new file#44 to file$(old file#29) Adding new file#45 to file$(old file#30) Adding new file#46 to file$(old file#31) Adding new file#47 to file$(old file#32) Successfully created internal service pdbtest at open **************************************************************** Post plug operations are now complete. Pluggable database PDBTEST with pdb id - 4 is now marked as NEW. **************************************************************** Pluggable database PDBTEST dictionary check beginning Pluggable Database PDBTEST Dictionary check complete Database Characterset for PDBTEST is ZHS16GBK Opatch validation is skipped for PDB PDBTEST (con_id=0) *************************************************************** WARNING: Pluggable Database PDBTEST with pdb id - 4 is altered with errors or warnings. Please look into PDB_PLUG_IN_VIOLATIONS view for more details. *************************************************************** 2017-03-12 12:59:16.971000 +08:00 JIT: pid 5236 requesting full stop 2017-03-12 12:59:18.966000 +08:00 Opening pdb with no Resource Manager plan active Pluggable database PDBTEST opened read write Completed: alter pluggable database pdbtest open
源庫對應的ALERT 日誌
# ALERT LOG 2017-03-12T12:54:40.070341+08:00 Thread 1 advanced to log sequence 159 (LGWR switch) Current log# 3 seq# 159 mem# 0: /oracle/app/oracle/oradata/ORCL122/onlinelog/redo03.log 2017-03-12T12:54:40.611341+08:00 Archived Log entry 98 added for T-1.S-158 ID 0x9b6eb4 LAD:1 2017-03-12T12:58:57.765334+08:00 TEST(6):JIT: pid 20670 requesting stop 2017-03-12T12:58:58.312698+08:00 TEST(6):opiodr aborting process unknown ospid (7259) as a result of ORA-1089 2017-03-12T12:58:58.406081+08:00 TEST(6):KILL SESSION for sid=(58, 61986): TEST(6): Reason = PDB close immediate TEST(6): Mode = KILL HARD FORCE -/-/- TEST(6): Requestor = USER (orapid = 27, ospid = 20670, inst = 1) TEST(6): Owner = Process: USER (orapid = 56, ospid = 7259) TEST(6): Result = ORA-0 TEST(6):KILL SESSION for sid=(64, 20274): TEST(6): Reason = PDB close immediate TEST(6): Mode = KILL HARD FORCE -/-/- TEST(6): Requestor = USER (orapid = 27, ospid = 20670, inst = 1) TEST(6): Owner = Process: USER (orapid = 57, ospid = 13885) TEST(6): Result = ORA-0 TEST(6):KILL SESSION for sid=(69, 18219): TEST(6): Reason = PDB close immediate TEST(6): Mode = KILL HARD FORCE -/-/- TEST(6): Requestor = USER (orapid = 27, ospid = 20670, inst = 1) TEST(6): Owner = Process: USER (orapid = 52, ospid = 8682) TEST(6): Result = ORA-0 TEST(6):KILL SESSION for sid=(70, 22999): TEST(6): Reason = PDB close immediate TEST(6): Mode = KILL HARD FORCE -/-/- TEST(6): Requestor = USER (orapid = 27, ospid = 20670, inst = 1) TEST(6): Owner = Process: USER (orapid = 59, ospid = 15135) TEST(6): Result = ORA-0 2017-03-12T12:59:01.770159+08:00 Pluggable database TEST closed TEST(6):JIT: pid 20670 requesting stop 2017-03-12T12:59:05.132239+08:00 Pluggable database TEST closed 2017-03-12T12:59:12.712096+08:00 Deleted Oracle managed file /oracle/app/oracle/oradata/ORCL122/492D54D080AD4990E053D238A8C08E62/datafile/o1_mf_undo_dbz88np1_.dbf Deleted Oracle managed file /oracle/app/oracle/oradata/ORCL122/492D54D080AD4990E053D238A8C08E62/datafile/o1_mf_users_dbz88np1_.dbf Deleted Oracle managed file /oracle/app/oracle/oradata/ORCL122/492D54D080AD4990E053D238A8C08E62/datafile/o1_mf_temp_dbz88np0_.dbf Deleted Oracle managed file /oracle/app/oracle/oradata/ORCL122/492D54D080AD4990E053D238A8C08E62/datafile/o1_mf_sysaux_dbz88noz_.dbf Deleted Oracle managed file /oracle/app/oracle/oradata/ORCL122/492D54D080AD4990E053D238A8C08E62/datafile/o1_mf_system_dbz88noo_.dbf
Summary:
12.2的online pdb relocate 實現了PDB 線上幾乎零停機時間在不同CDB之間的遷移，且在relocate過程中源庫一直是open read-write狀態，使用了增量日誌的方式追加減少了最源庫和網路資源的影響。降低了PDB操作和移動如上雲、下雲的代價。
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........................................................................................................................ ● 本文作者：小麥苗，部分內容整理自網路，若有侵權請聯絡小麥苗刪除 ● 本文在itpub（ http://blog.itpub.net/26736162 ）、部落格園（ http://www.cnblogs.com/lhrbest ）和個人weixin公眾號（ xiaomaimiaolhr ）上有同步更新 ● 本文itpub地址： http://blog.itpub.net/26736162 ● 本文部落格園地址： http://www.cnblogs.com/lhrbest ● 本文pdf版、個人簡介及小麥苗雲盤地址： http://blog.itpub.net/26736162/viewspace-1624453/ ● 資料庫筆試面試題庫及解答： http://blog.itpub.net/26736162/viewspace-2134706/ ● DBA寶典今日頭條號地址： http://www.toutiao.com/c/user/6401772890/#mid=1564638659405826 ........................................................................................................................ ● QQ群號： 230161599 （滿） 、618766405 ● weixin群：可加我weixin，我拉大家進群，非誠勿擾 ● 聯絡我請加QQ好友 （ 646634621 ） ，註明新增緣由 ● 於 2018-12-01 06:00 ~ 2018-12-31 24:00 在魔都完成 ● 最新修改時間：2018-12-01 06:00 ~ 2018-12-31 24:00 ● 文章內容來源於小麥苗的學習筆記，部分整理自網路，若有侵權或不當之處還請諒解 ● 版權所有，歡迎分享本文，轉載請保留出處 ........................................................................................................................ ● 小麥苗的微店 ： https://weidian.com/s/793741433?wfr=c&ifr=shopdetail ● 小麥苗出版的資料庫類叢書 ： http://blog.itpub.net/26736162/viewspace-2142121/ ● 小麥苗OCP、OCM、高可用網路班 ： http://blog.itpub.net/26736162/viewspace-2148098/ ● 小麥苗騰訊課堂主頁 ： https://lhr.ke.qq.com/ ........................................................................................................................ 使用 weixin客戶端 掃描下面的二維碼來關注小麥苗的weixin公眾號（ xiaomaimiaolhr ）及QQ群（DBA寶典）、新增小麥苗weixin， 學習最實用的資料庫技術。
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