I have to move a database from DB2 for iSeries V7R2 to DB2 LUW 10.5. As far as I understand, utilities such as db2move and db2look aren't available on iSeries. So what is the best technique to achieve the goal?
If you are able to connect to the iSeries database from a LUW machine (via DCS gateway/DB2 Connect feature) you could run the db2look from the LUW side.
Beware if you run the db2look on the LUW side it still gives you DDL with all the iSeries parameters. This means e.g. if a char column on iSeries could be 255 long (as on z/OS, I don't know the specs for iSeries) the db2look will still give you a create statement for that column with 255 byte although DB2 LUW only supports 254 byte CHAR columns.
Like with the db2look via "gateway" you could declare cursors on the iSeries the same way and then load directly into the target database. You may need to convert the restrictions (like mentioned above) already in the SQL Statement for the reading cursor.
Good part on the cursor approach is that due to the point that both DB2 sides are talking directly with another there is an implicit codepage conversation which you would need to manage yourself if you try to extract the data from iSeries and reload it into LUW.
Related
Does DB2 9.7 offer tools to move data between two databases? And only from selected tables? The schema varies slightly between the two, mostly so that the destination database contains some new columns (will be left as null of course) and some columns have changed datatype.
Thanks
You can use federation between the two databases. You create "aliases" from one database in the other one, and then you just perform select or other operations on the remote table. For example, you can use a "load from cursor" using an alias.
Another way to do that, is using db2move or specifically export/import, but you need to deal with files.
Remember, federation is free between db2 databases, no extra license is required.
I just heard that Oracle has a feature called External Table that allows to access a flat file (for example a CSV file in the file system) from the database.
I just want to know if there is something similar in DB2 for LUW.
The closest thing I could see is to implement a Table function (written in Java, for example) that will read the file, and return a table with the data from the file. However, this procedure takes a long time (create the Java code, compile the Java and create the function in DB2 associating the Java class) and the implementation is not dynamic for different files with different quantity of columns (table function returns a predefined set of columns).
Here the documentation of Oracle External Tables: http://docs.oracle.com/cd/B28359_01/server.111/b28319/et_concepts.htm
Yes, IBM offers this as part of their InfoSphere Federation Server, which basically allows you to define nicknames inside a database to various data sources. Supported data sources
IBM Db2 11.5 has support for external tables that will allow you to do this.
This was formerly provided only by Netezza and this functionality has made its way to Db2.
See the manual page for CREATE EXTERNAL TABLE here https://www.ibm.com/support/knowledgecenter/en/SSEPGG_11.5.0/com.ibm.db2.luw.sql.ref.doc/doc/r_create_ext_table.html
As mentioned, InfoSphere Federation Server is a good choice. There are two alternatives for DB2 UDB (Universal Database), which may be helpful in specific use cases:
DataLinks: it is basically another data type
that keeps a reference to your external file. It also provides
several levels of control over external data such as referential
integrity, access control, coordinated backup and recovery, and
transaction consistency.
DB2 Extenders: they extend functionality of the DB2 to operate on specific file formats, e.g. XML Extender provide set of features to operate on XML files inside DB2
There is also:
(a) external table support in the warehousing engine products (Db2 Warehouse, Db2 Warehouse on Cloud) (b) Data virtualization (aka federation/fluid query) in all Db2 products which may achieve the same thing.
I want to transfer some tables of DB2 to oracle daily for accessing them from web page,
But I don't know commands of DB2. How to do this?
I want this action should perform on database daily on particular time, so is there any tool is available to do this operation. And for writing the program for operating above query which programming language should I use? I am using windows XP.
I think Change Data Capture is used to replicate DML from one database to other databases continuously.
However, what you need is to transfer some data at a particular time each day, thus CDC could be too heavy for that.
You could do a simply "db2 export", and then you could import the generated file from Oracle.
There should be an option to create an adapter in Oracle that permits to query DB2 tables. The opposite is called federation in DB2 (InfoSphere Information Server) that permits to query Oracle tables.
Export http://publib.boulder.ibm.com/infocenter/db2luw/v9r7/topic/com.ibm.db2.luw.admin.cmd.doc/doc/r0008303.html
CMD examples http://publib.boulder.ibm.com/infocenter/db2luw/v9r7/topic/com.ibm.db2.luw.admin.dm.doc/doc/r0004567.html
Check this link
http://blogs.oracle.com/warehousebuilder/entry/simple_change_data_capture_from_db2_table_to_oracle_table
In 11.2 releases, Change Data Capture (CDC) can be done by code template mapping. This allows users to capture the data changes from heterogeneous data source, and load into the target across different platforms.
We have a daily process that pulls all data out of a number of tables in an Oracle database and imports them into a Postgress (EnterpriseDB) database - Version 8.4.
We are currently using a java application to select * from each table, change the keywords (date, timestamp, etc) and then import them into the Postgres Database.
Are there any tools available in Postgres that would provide a more efficient manner of doing this? I should note that there are CLOBs that are being transported over.
There is Ora2Pg, which is intended as a one-time-migration tool, but it might work in your case as well. I think of it as an Oracle-to-PostgreSQL pg_dump.
Is there a way to query an Information Schema from DB2 and dump the contents(tables - structure only),into another database? I'm looking for a way to create a shell model of a database schema from DB2 into a SQL Server database?
Thanks
You can use db2look to get the table structure (DDL) out of db2.
Once you've got it, however, I'm afraid you'll have to manually replace any db2-specific syntax (datatypes, storage parameters, etc.) with it's corresponding SQL Server syntax.
It doesn't look like Microsoft's Migration Tool works for db2 yet. :(