oracle index for string column - does format of data affects quality of index?

Posted by Jayan on Stack Overflow See other posts from Stack Overflow or by Jayan
Published on 2011-01-01T02:50:38Z Indexed on 2011/01/01 2:53 UTC
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Performance

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Oracle

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oracle10g

We have following type of "Unique ID" column for many tables in the database (Oracle). It is a string with following format

<randomnumber>-<ascendingnumber>-<machinename>

So we have some thing like this

U1234-12345-NBBJD
U1234-12346-NBBJD
U1234-12347-NBBJD
U1234-12348-NBBJD
U1234-12349-NBBJD

The UID value is unique, we have unique index on them. Does the following format is more efficient than above for index scans?

NBBJD-U1234-12345
NBBJD-U1234-12346
NBBJD-U1234-12347
NBBJD-U1234-12348
NBBJD-U1234-12349

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