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POWhy does Char(1) change to Char(3) when copying over an Oracle DBLINK?
 

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  1. POWhy does Char(1) change to Char(3) when copying over an Oracle DBLINK?
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    <p>I have 2 databases, and <strong>I want to transport an existing table containing a CHAR column from database A to database B.</strong></p> <p>Database A is Oracle 9i, has encoding WE8ISO8859P1, and contains a table "foo" with at least 1 column of type CHAR(1 char). I can not change the table on database A because it is part of a third party setup.</p> <p>Database B is my own Oracle 10g database, using encoding AL32UTF8 for all kinds of reasons, and I want to copy foo into this database.</p> <p>I setup a database link from database B to database A. Then I issue the following command:</p> <p>*create table bar as select * from #link#.foo;*</p> <p>The data gets copied over nicely, but when I check the types of the columns, I notice that CHAR(1 char) has been converted into CHAR(3 char), and when querying the data in database B, it is all padded with spaces.</p> <p>I think somewhere underwater, Oracle confuses it's own bytes and chars. CHAR(1 byte) is different from CHAR(1 char) etc. I've read about all that.</p> <p><strong>Why does the datatype change into a padded CHAR(3 char) and how do I stop Oracle from doing this?</strong></p> <p><em>Edit: It seems to have to do with transfering CHAR's between two specific patchlevels of Oracle 9 and 10. It looks like it is really a bug. as soon as I find out I'll post an update. Meanwhile: don't try to move CHAR's between databases like I described. VARCHAR2 works fine (tested).</em></p> <p><em>Edit 2: <strong>I found the answer and posted it here:</strong> <a href="https://stackoverflow.com/questions/253971/why-does-char1-change-to-char3-when-copying-over-an-oracle-dblink#263467">Why does Char(1) change to Char(3) when copying over an Oracle DBLINK?</a> Too bad I can not accept my own answer, because my problem is solved.</em></p>
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