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RE: Something easy? ORA-01450: maximum key length (6398)exceeded

Wolfson Larry - lwolfs

2006-01-20

Gints, Norman,
         Thanks for your replies. I have a better understanding
of what's going on.
Oracle support did get the original to work, but they did it on a
9.2.0.7 database.
 I'll see what application group has to say.

 Thanks again,

 Larry
!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
One character generally can take 1 or more bytes If you define CLASS
VARCHAR2(2000) which is equivalent to CLASS VARCHAR2(2000 BYTE) you can
store up to 2000 single-byte characters or less multi-byte characters
mixed with single-byte characters. For example you cannot insert 1999
single-byte caharacters and 1 multi-byte character.
If you define CLASS VARCHAR2(2000 CHAR) then you can insert 2000 chars
irrespective of their single- or multi- bytes.

Gints

a bit more
http://download-west.oracle.com/docs/cd/B10501_01/appdev.920/a96590/adfn
styp.htm#424673

-----Original Message-----
From: oracle-l-bounce@(protected)
[mailto:oracle-l-bounce@(protected)
Sent: Friday, January 20, 2006 2:39 AM
To: Wolfson Larry - lwolfs; oracle-l@(protected)
Subject: Re: Something easy? ORA-01450: maximum key length
(6398)exceeded


Larry,

>> Got an import from a client that kept getting

>> IMP-00003: ORACLE error 1450 encountered
>> ORA-01450: maximum key length (6398) exceeded

>> when creating index for table below.

You need to patch to 9204 or above (9207 is currently the highest, 9208
coming 'soon'). I had exactly the same problem on a 9203 (I think)
database. We had a table with an index that was over 4000 bytes long.
I've no idea how it was create or how the problem was detected - it was
over a year and a half ago, and I'm getting old) but I've a funny
feeling that it was a bug introduced at some point.

Our app was a third party one (oh hum) and full of little niceties such
as an index consisting of two columns each varchar2(4000) etc. It also
had no primary keys on the tables and suffered from duplicates all the
time. This was due to 'select max(id) from table; add 1; use as new id.
Oops !). I'm no longer at that company :o)

See note 136158.1 for details - although it appears to imply that 6498
is the max key size in a 16K block, yet yours is barfing at 6398. Who's
nicked the 100 bytes ? However, you also show that your block sizes are
8192 each which surprises me as an 8K block supports a maximum key
length of only 3218 bytes. (Which might really be 3118 - who knows?).

You might also be hitting bug 1919383, see note 1919383.8 for details.


HTH

Cheers,
Norman.


Norman Dunbar.
Contract Oracle DBA.
Rivers House, Leeds.

Internal : 7 28 2051
External : 0113 231 2051


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