DMU Introduction 1

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Introduction to DMU (Database Migration Assistant for Unicode)

Presenter : Gunther Vermeir Principal Technical Support Engineer

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product direction. It is intended for information

purposes only, and may not be incorporated into

any contract. It is not a commitment to deliver any

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Introduction to DMU (Database Migration Assistant for Unicode)

Presenter : Gunther Vermeir Principal Technical Support Engineer

Notes and links

The Database Migration Assistant for Unicode (DMU) Tool (Doc ID 1272374.1)

http://www.oracle.com/technetwork/database/globalization/dmu/overview/index.html

Related: AL32UTF8 / UTF8 (Unicode) Database Character Set Implications (Doc ID 788156.1)

Going to AL32UTF8 or UTF8

Validating an AL32UTF8 or UTF8

database

How to provide information when

logging a SR

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Questions and answers • We are in the planning process of converting our PS financial

database from database character set 1252 to AL32UTF8. Can

this method be used for that? The database size is about 2T�and

the db version is 10.2.0.4.

Yes, if the OS is supported you can use this tool. The database

size as such is not very relevant – what is more relevant is how

much convertible data you have.

• Can DMU be used from MSSQLSERVER/SYBASE/DB2

database to oracle database?

No. DMU is Oracle only.

• Is DMU free?

• What about long, LOB data type ? Will that be migrated from one

db to other db - say 10.2.4 on AIX to 11.2.0.3 on Sun Solaris ?

(continued)�

Questions and answers (cont.) (cont.) DMU is not a migration tool. DMU changes the encoding

of a database – it will not take the data from a 10.2.0.2 and move

it to a 10.2.0.3. For that you have the Export /Import tool.

Yes, it works with longs and clobs. It works with all character

datatypes.

• What about dictionary migration problems ?

DMU already addresses a lot of the dictionary table conversion

related problems. This is one of its strong points when compared

to CSSCAN.

• This conversion needs a source and target / a repository ?

It is a tool that works on one database.

• Is DMU clever enough to resume after failure.

It is resumable. If during conversion you have an error, DMU will

stop and you will have the chance to see what is going on and

resume the operation. There are some rare cases when it is best

Questions and answers (cont. 2)

(cont.) to go back to the backup and start from there, but these

are very rare cases. It is always recommended to always have a

backup when attempting to change the database characterset.

• Can DMU can be used to convert a UTF8 database to

AL32UTF8?

• Does DMU give you an estimate of the tablespace size increase

(if any) before the actual conversion ? �

Yes, it does, but it is an estimation.

• Running this from client is risky at times for a DB in size of

several TBs, is it possible to create jobs after validation/cleansing

to let the conversion run in the background?�

Actually, most of it runs in the background. The client

communicates with the server where the process actually runs.

You can run it on the server itself if worried about (cont.)

• (cont.) connectivity issues. It is a Java based client, so you can

run it on any server with Java v.6 on. It does need a TCP listener

connection though.

• Can I use in cross platforms like Windows server to Unix server

on same database version ?

There is not a DMU for 10.2.0.3 and a DMU 10.2.0.2. There is a

client which is a Java tool and it can connect to a database on a

different platform. You can run DMU from a HP-UX machine to

convert a database located on a Windows machine or viceversa.

That’s not an issue.

• What would be the sizing impact from migrating from utf8 to

AL32UTF8� ?

Almost 0.

• Do I need to install the DMU tool on server side itself?�

(continued)

(cont.) No. There are 2 components: the Java tool client which

you can download as a zip file, unzip and install and the

database which must have a certain version and patch installed.

They are totally separate.

• �Are there are scripts available to group the exceptions from the

underlying DMU tables?

There are no scripts available yet. If you like scripting you can

still use CSSCAN.

Just to mention, CSSCAN/CSALTER and DMU are totally

different things (though they try to obtain the same) and in a

database where both DMU and CSSCAN run, DMU will have no

idea about what CSSCAN is doing.

• We have 80,000 exception records how does one know what can

be fixed manually or in batch mode ? (continued)

• (cont.) It depends on the exceptions. If it’s invalid representation,

then sample data and try to figure out which encoding is and try

to use that as a character set. If the column is not large enough,

check if you can use CHAR semantics or if you can enlarge

column. The size means that there will be a lot of work, most

likely the errors address multiple tables. But the tool does not

know what you wish to do further. If the data is not desired

anymore, use export/import and then the data will become “?”.

• CSCAN and CALTER still supported with 11g ?��

• � Does this work for Oracle EBS suite database? �

�Yes.

• Is DMU supported by Oracle Support currently?

Further Info & Help

• Advisor Webcast Archived Recordings (Doc ID 740964.1)

• Advisor Webcast Current Schedule (Doc ID 740966.1)

• DB Newsletter (Doc ID 1284265.1)

• MOS Community Database Administration / SQL Language

THANK YOU

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