BLOB Vs XMLTYPE, which is better!!?

Hi all, we currently store our XMLs as BLOB in a relational table, now we need to do wildcard search on the XML and are thinking of changing the column to XMLTYPE for better performance. But still we know there are options for wildcard searching in BLOB itself, but we are worried about performance hit. Also it seems difficult to do XMLTYPE using hibernate. We would be transacting millions of XMLs per week.
Can you please suggest which out be the best datatype for the column, remain with BLOB or to go with XMLTYPE and also specify which type of indexing is better Oracle Free Text or Unstructured XMLIndex for XMLType considering better performance.
Thanks!!

It's definitely possible to map an SQLXML object using Hibernate. Check out the section of the Hibernate UserType mappings in the manual here:
http://docs.jboss.org/hibernate/orm/4.1/manual/en-US/html/ch06.html#types-custom
I've done this myself; it basically involves implementing the UserType class and then adding a typedef to your hibernate-mapping file.
I agree with Anon that you'll get far better performance for searching (as well as using far less space with XML BINARY storage) if you switch to XMLType. His blog has some good performance tips, by the way (thank you, Anon). However - a warning: you say that you are transacting millions of XML's a week; if you are replacing them, then you should be fine, but I've experienced problems updating pieces of the document that are large (where the XML being updated is too big for the O/R storage option, but too small for the CLOB storage option). YMMV.

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We have to store XML in one of the fields in our table.
XML size is not fix but its not so huge that we shold go for external LOBs.
I mean it will be alwas less than 4G.
Our concern here is, does CLOB allocates exactly as much memory needed as much the data is present,(something like VARCHAR2).
How is it in case of BLOB and XMLTYPE as well?
Is there any Oracle documentation or way (code snippet) to verify this?
Thanks in advnace.
Avinash.

You have asked if CLOB allocates space like VARCHAR2 - yes it does. Maybe this example will be better:
SQL> TRUNCATE TABLE test_table;
Tabela zosta│a obciŕta.
SQL> insert into test_table values(LPAD('A', 100, 'A'));
1 wiersz zosta│ utworzony.
SQL> insert into test_table values(LPAD('A', 1000, 'A'));
1 wiersz zosta│ utworzony.
SQL> insert into test_table values(LPAD('A', 10000, 'A'));
1 wiersz zosta│ utworzony.
SQL> COMMIT;
Zatwierdzanie zosta│o uko˝czone.
SQL> SELECT LENGTH(col1) FROM test_table;
LENGTH(COL1)
         100
        1000
        4000
SQL>

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[Removed link]
Message was edited by: sinious

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Free News Reader
http://put.hk
http://put.hk/reader/forums.macromedia.com/macromedia.flash.html

1Evan2Wing3 wrote:
> Which is better for doing animation? Flash 4, 5, MX, CS,
or others?
>
> I am used to using brush function more conveniently in
Flash 4 than the other versions I ve tried. However, Flash 4
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Urami
"Never play Leap-Frog with a Unicorn."
<urami>
If you want to mail me - DO NOT LAUGH AT MY ADDRESS
</urami>

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