Oracle Database Cross Platform Migration Lucy Feng, DBAK

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1 Delivering Oracle Success Oracle Database Cross Platform Migration Lucy Feng, DBAK RMOUG QEW November 19, 2010

2 Business Requirements Migrate all Oracle databases to IBM zseries based Linux The database servers were on Sun SPARC, Linux or Solaris x86 Databases are on 10gR2: or Multiple databases need to be migrated within 4-hour window Database sizes range from 200 GB to 1.2 TB DBAK

3 Options Data Guard Standby is not an option because of the platform difference Export/Import or data pump take too long Oracle Streams is discarded because of the risk of data divergence The methods chosen are: Cross Platform Transportable Tablespace Transportable Database DBAK

4 Cross Platform Transportable Tablespace Transportable Tablespace is a feature introduced in 8i It allows nonsystem tablespaces to be moved from one database to another by physically grafting the tablespace datafiles into the control files on the target database, and then importing object metadata into the target database s dictionary DBAK

5 Cross Platform Transportable Tablespace Transportable tablespace (TTS) in 8i works between the same block size Oracle 9i removed the block size restriction, but still required homogeneous operating systems Oracle 10g introduced Cross Platform TTS (XTTS) which allows TTS to function across different platforms DBAK

6 How XTTS Works DBAK

7 Endian Format Endianness how multi-byte data is stored in computer memory Two formats Little Endian and Big Endian Dictated by the CPU architecture Linux, Windows use Little Endian byte order Sun Sparc, HPUX use Big Endian byte order Join V$DATABASE and V$TRANSPORTABLE_PLATFORM RMAN Convert performs endian conversion DBAK

8 RMAN Convert Convert datafile, convert tablespace and convert database Convert tablespace must be run from the source database Convert database can only be used when the source and target platforms share the same endian format. It creates a convert script and a transport script DBAK

9 RMAN Convert In addition to convert endian format, RMAN convert also: Reformats blocks of undo segments. It is required for transporting datafiles containing undo segments between platforms, regardless of endian format. Transports datafiles stored in ASM DBAK

10 RMAN Convert prerequisite Both the source and destination platforms must be supported by the convert command. Query V$TRANSPORTABLE_PLATFORM. Both source and destination databases must have COMPATIBLE set to or higher. Read-only tablespaces must be made read/write at least once. DBAK

11 RMAN Convert Datafile Syntax RMAN connect to destination database as target: CONVERT DATAFILE '/u01/oradata/datafile/undo.dbf' FROM PLATFORM ''Linux x86 64-bit'' FORMAT '+OCDPRD_DATA'; DBAK

12 How XTTS Works DBAK

13 Incrementally updated image copy backup An image copy is identical to the original file RMAN prefers to use an image copy over a backup set if you have both. There is more overhead in sorting through a backup set. Use switch command to point the database to the image copy datafile no need to restore RMAN takes an image copy of database as a base backup, and as subsequent incremental backups are taken, they are applied (recovered) on the image copies. DBAK

14 Incrementally updated image copy backup rman>backup incremental level 1 for recover of copy with tag 'ROLLING_BAKCUP' database; rman>recover copy of database with tag 'ROLLING_BACKUP'; Point in time recovery of the database cannot be performed before the last application of the incremental backup. Delayed merge is common. rman>run { recover copy of database with tag 'ROLLING_BACKUP'; backup incremental level 1 for recover of copy with tag 'ROLLING_BAKCUP' database;} DBAK

15 Servers and data movement Source server NFS server Target server Gigabit connection Hyper socket NFS Data store NFS Rman convert Data store DBAK

16 XTTS - Preparation Create the Destination Database STARTUP NOMOUNT CREATE DATABASE "CDSPRD" LOGFILE GROUP 1 ('+CDSPRD_ORADATA','+CDSPRD_ARCH') SIZE 500M, GROUP 2 ('+CDSPRD_ORADATA','+CDSPRD_ARCH') SIZE 500M, GROUP 3 ('+CDSPRD_ORADATA','+CDSPRD_ARCH') SIZE 500M, GROUP 4 ('+CDSPRD_ORADATA','+CDSPRD_ARCH') SIZE 500M DATAFILE '+CDSPRD_ORADATA' SIZE 501m autoextend on next 50m maxsize 20001m SYSAUX DATAFILE '+CDSPRD_ORADATA' SIZE 501m autoextend on next 50m maxsize 20001m UNDO TABLESPACE UNDO DATAFILE '+CDSPRD_ORADATA' SIZE 501m autoextend on next 50m maxsize 20001m DEFAULT TEMPORARY TABLESPACE TEMP TEMPFILE '+CDSPRD_ORADATA' SIZE 501m autoextend on next 50m maxsize 20001m MAXLOGFILES 20 MAXLOGMEMBERS 5 MAXDATAFILES 1000 MAXINSTANCES 5 MAXLOGHISTORY 2696 CHARACTER SET WE8ISO8859P1 ; DBAK

17 XTTS - Preparation Create the Destination Database connect system/manager select comp_name,version,status from dba_registry; DBAK

18 XTTS Preparation Generate the Conversion Script Run from the source database spool convert.rman prompt run { select 'CONVERT DATAFILE ''' file_name ''' FROM PLATFORM ''Linux x86 64-bit'' FORMAT ''+CDSPRD_ORADATA'';' from dba_tablespaces a, dba_data_files b where a.tablespace_name = b.tablespace_name and a.tablespace_name not in ('SYSTEM','SYSAUX') and contents = 'PERMANENT'; prompt } spool off DBAK

19 XTTS - Preparation Generate User Creation Script From Source and Run in Target spool gen_cre_user.sql select 'create user ' username ' identified by values ''' password ''';' from dba_users; spool off spool gen_alt_user.sql select 'alter user ' username ' identified by values ''' password ''';' from dba_users; spool off DBAK

20 XTTS - Steps Convert to Read Only spool tts_ro.sql select 'ALTER TABLESPACE ' tablespace_name ' READ ONLY;' from dba_tablespaces where tablespace_name not in ('SYSTEM','SYSAUX') and contents = 'PERMANENT'; spool off set heading on feedback DBAK

21 XTTS - Steps Export Metadata from the Source Database expdp userid=\'/ as sysdba\' parfile=tbs_exp.par cat tbs_exp.par directory=tbsdir dumpfile=tbs.dmp logfile=tbsexp.log transport_full_check=no transport_tablespaces=userdata,userindexes,users expdp userid=\'/ as sysdba\' directory=tbsdir \ dumpfile=full.dmp logfile=full.log \ content=metadata_only full=y DBAK

22 XTTS - Steps Execute the Convert Datafile Script in the Target Database Import Metadata in Target Database impdp userid=\'/ as sysdba\' parfile=tbs_imp.par cat tbs_imp.par directory=tbsdir dumpfile=tbs.dmp logfile=tbsimp.log transport_datafiles= '+CDSPRD_ORADATA/CDSPRD/DATAFILE/USERINDEXES ', '+CDSPRD_ORADATA/CDSPRD/DATAFILE/USERINDEXES ', DBAK

23 XTTS - Steps Import Metadata impdp userid=\'/ as sysdba\' directory=tbsdir dumpfile=full.dmp logfile=full.log DBAK

24 XTTS - Steps Set Tablespaces to Read/Write in Destination Database Run Post Conversion steps SHUTDOWN IMMEDIATE @?/rdbms/admin/utlrp.sql Restart database and validate DBAK

25 XTTS Check Self Containment Tablespaces transported must be self-contained Examples of object relationships that may cause containment violations: A table and its index An IOT and its overflow segment Table partitions and subpartitions A referential integrity DBAK

26 XTTS Check Self Containment for ts in (select tablespace_name from dba_tablespaces where tablespace_name not in ('SYSTEM','SYSAUX') and contents = 'PERMANENT') loop dbms_tts.transport_set_check(checklist,true,true); select * from transport_set_violations; DBAK

27 Transportable Database (TDB) TDB introduced in 10gR2. It is used to automate the movement of an entire database from one platform to another. The key is the source and the destination platforms must have the same endian format From the Source Database, query v$db_transportable_platform. If the target platform is in the output, using TDB is supported. DBAK

28 Transportable Database Process Check prerequisites dbms_tdb.check_external: external tables, directories or BFILES must be recreated on the target dbms_tdb.check_db: database read-only, active or in-doubt transactions, compatibility 10 or higher, etc. Transport the data files Run convert database command. Convert database generates a convert script and a transport script. Transport environment Copy the initialization parameters (pfile or spfile), listener.ora and tnsnames.ora to the target server. Start the target database Start the new database on the target system. Control file and redo logs will be recreated. DBAK

29 Transportable Database In a Nutshell Datafiles containing undo information need to be reformated to fit the target platform. Use RMAN convert datafile to convert them. Ensure datafiles are ready for conversion. Prepare the target database as if you are doing a database clone. Prepare pfile or spfile and password file. Prepare listener.ora and tnsnames.ora Recreate control file and redo logs. Open resetlogs DBAK

30 Transportable Database Steps Step 1 -- Restore Control File, mount and rename datafiles rman>startup nomount; rman>restore controlfile from '/zdb_nfs/atdprd/c '; rman>alter database mount; rman>switch database to copy; DBAK

31 Transportable Database Steps Step 2 Create the RMAN Conversion Script Sql> spool convert.rman prompt run { select 'CONVERT DATAFILE ''' f.name ''' FROM PLATFORM ''Solaris[tm] OE (64-bit)'' FORMAT ''+' d.name '_ORADATA'';' from v$dbfile f, v$database d; prompt } spool off DBAK

32 Transportable Database Steps Step 3 Startup Nomount and run the Conversion Script from Step 2 Step 4 Create a new Control File. Get new Datafile names from ASMCMD. Open Resetlogs Step 5 Run Post Conversion Steps Recreate TEMP Recompile PL/SQL Packages Step 6 Ensure Control File and Redo Logs are moved to ASM DBAK

33 Plan for downtime Plan for Downtime Outage Start Database is up Full backup, Daily incremental and merge Shutdown Startup mount Incremental backup and merge Convert and transfer Post steps DBAK

34 Speed it up Block change tracking 10g and up CTWR backgroup process tracks changed blocks as redo is generated and writes to a binary file. Sql>alter database enable block change tracking using file +ATDPROD_DATA ; Sql>select status, filename, bytes from v$block_change_tracking DBAK

35 Speed it up Allocate multiple channels for incremental backup Convert in parallel RUN { CONVERT DATAFILE '/cds_mnt/cdsprd/audit_data01.dbf', '/cds_mnt/cdsprd/index_data01.dbf',... '/cds_mnt/cdsprd/user_data01.dbf', '/cds_mnt/cdsprd/user_data02.dbf' FROM PLATFORM 'Linux x86 64-bit' PARALLELISM 3 DB_FILE_NAME_CONVERT '/cds_mnt/cdsprd/','+cdsprd_oradata/' ;} DBAK

36 Speed it up Convert datafiles of read-only tablespaces in advance Ensure NFS mount optimization How to optimize NFS Performance with NFS option DBAK

37 Recap When the source and the destination platforms are different and the endian formats are different create a receiving database, import metadata and use RMAN convert to convert datafiles of the transported tablespaces When the source and destination endian formats are the same use RMAN convert to convert datafiles with undo information and recreate the control file and redo logs. DBAK

38 Benefits of XTTS and TDB Reduced complexity and errors A high-level copy of data It moves objects as a unit, unlike table-by-table methods that could miss objects or rows of data No need to create or rebuild indexes Reduced downtime DBAK

39 E-Business Suite Database Cross Platform Transportable Tablespaces on 11i with 10gR Using Transportable Database to migrate Oracle E-Business Suite Release 11i using Oracle Database 10g Release 2 or 11g Enterprise Edition Using Transportable Database to migrate E-Business Suite R12 using Oracle Database 10gR2 or 11g DBAK

40 Contact Lucy Feng DBAK

41 About DBAK Oracle solution provider Co-founded in 2005 Based in Englewood, CO 2008 Emerging Business of the Year South Metro Denver Chamber of Commerce More than 130 implementations, upgrades, conversions, and support projects for 80+ clients Average 15 years of Oracle expertise Oracle Gold Partner DBAK

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