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Defining string as key in dictionary for DB2 database

Posted on Nov 17, 2005 at 10:18 AM 8 Views

I am converting from a Websphere environment to SAP NW. My DB2 database has strings in the keys, but when I define them in the NW dictionary I get "Dictionary Generation: SAPDBcheckWidth TABLENAME: index on BLOB, CLOB, LONGVARBINARY or LONGVARCHAR is not allowed". Anybody got any ideas? I have defined my database vendor as DB2_UDB in persistence.xml (in the EJB project), but I can't find anything in the dictionary project to tell it strings are OK!

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  • author's profile photo Helmut Cossmann
    Helmut Cossmann
    Posted on Nov 18, 2005 at 07:33 AM
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    If you need indexes on string columns then the column's width must not exceed about 300 characters. If you only need '%' in the where but no indexes then the next threshold is at about 1000 characters. Any strings longer than that are usually mapped onto a variation of LOB, reducing the available operators to = and !=.

    helmut

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