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Copying data from One Cloumn to another Column in a DB2 Tabl

 
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Manju-Pacha

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Joined: 21 Mar 2007
Posts: 7
Location: Bangalore

PostPosted: Wed Oct 24, 2007 11:16 am    Post subject: Copying data from One Cloumn to another Column in a DB2 Tabl
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Hi,

I need to copy data from an existing column A in a Db2 table to a newly added column B for all the existing records. Once done, I need to space out the Column A values. There are other columns as well in the table.

Column A CHAR(18) NOT NULL
Column B CHAR(20) NOT NULL

As per DBA suggestion, we shouldn't use SPUFI because we will be changing too many pages without the commit. DB2 may abend the SPUFI if the updated # of pages reach the system allowable limit. Hence we need to write a one-time DB2 batch job to do this and make sure to put the COMMIT logic for say every 1000 updates.

Could anyone provide any hint on how to accomplish this?
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dick scherrer

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Joined: 23 Nov 2006
Posts: 19270
Location: Inside the Matrix

PostPosted: Wed Oct 24, 2007 7:21 pm    Post subject:
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Hello,

One easy to do what you need is to write a bit of cobol code that declares a cursor, reads and updates the rows (moving the colA value to colB and spaces to colA in the same update) , and issues a checkpoint periodically.

You will want (or ask your dba) to create a backup of the table before you update it.
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