Query slow in table having XMLTYPE column

Hi,
I've a table and a XMLTYPE column in it.
table:
a number
b xmltype
now when 1000 records are present and I do a select * form table it runs for 5-8 mins..
if i put an index on a and do teh query using the index still it takes 5-6 secs to retrieve a single query.
Is it normal ? I mean to say is it because of the clob it's taking time or I can tune it ?
Thanks,
Arun

What sort of query are you running on it?
As a rule, XMLTYPE and CLOB columns tend to be big. On the other hand they would normally be stored out of line, so I don't see why they should affect a full table scan.
As is the usual case with performance questions, you must provide sufficient information for us to answer your question. Please read Rob Van Wijk's helpful guide on the sort of things we need to know (and incidentally how you can start to solve your problem yourself): [When your query takes too long|http://forums.oracle.com/forums/thread.jspa?threadID=501834&tstart=0]. Randolf Geist has knocked up a [HOW TO: Post a SQL statement tuning request |http://forums.oracle.com/forums/thread.jspa?threadID=863295] which is a template of the helpful way to layout a tuning question. Also, read [his blog on the topic|http://oracle-randolf.blogspot.com/2009/02/basic-sql-statement-performance.html]
You might also benefit from reading [Tom Kytes advice on how to ask questions|http://tkyte.blogspot.com/2005/06/how-to-ask-questions.html].
Cheers, APC
blog: http://radiofreetooting.blogspot.com

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Sql query slowness due to rank and columns with null values:


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go
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create table #result (PropertyKey int not null, BoughtDate datetime, OwnerKey int null, GroupKey int null, [Rank] int not null)Create index idx ON #result(OwnerKey ,rnk)
insert into #result(PropertyKey, BoughtDate, OwnerKey, GroupKey, [Rank])
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select PropertyKey, BoughtDate, OwnerKey, GroupKey
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Best Regards,Uri Dimant SQL Server MVP,
http://sqlblog.com/blogs/uri_dimant/
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How to get the rows from a table having some column has any letter

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Thanks to one and all.
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http://download.oracle.com/docs/cd/E11882_01/appdev.112/e10492/xdb_indexing.htm#BCGHGIGC
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CREATE INDEX ECI_SCHEMA.REV_ITEM_EARN_DTL_IX7
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LOGGING
PARALLEL(DEGREE 8 INSTANCES 1)
LOCAL
/Elements that occur at most once in each document can be indexed using extractValue(). Despite the fact that the index appears to be a functional index, when we create the index we automatically re-write the create index into a normal btree index on the column that contains the value for the element identified by the xpath.
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Eg
SQL> connect system/oracle
Connected.
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PURCHASEORDER                  LINEITEM_TABLE_MEMBERS
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2 /
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SQL> set lines 250
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PO_REF_INDEX                   NORMAL
LINEITEM_TABLE_MEMBERS         NORMAL
ACTION_TABLE_MEMBERS           NORMAL
SYS_C0011037                   NORMAL
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2 /
no rows selectedFrom the above we can see that the index created on extractValue has been re-written in a plain old vanilla BTREE index, and there is no definition for it in dba_ind_expressions So assuming you were able to create the index and insert the data you should find that your index is not a functional index.
]

Issue with extractvalue from table with XMLTYPE column.

I'm sure there is a simple answer but I am having problems
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When I run the following:
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SBELL-2002100912333601PDT is returned
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In short you want
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Below you''ll find the following to recreate the problem:
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=====================================================================================
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<xs:element name="PGPKeyPacket" type="xs:base64Binary" minOccurs="0"/>
<xs:any namespace="##other" processContents="lax" minOccurs="0"
maxOccurs="unbounded"/>
</xs:sequence>
<xs:sequence>
<xs:element name="PGPKeyPacket" type="xs:base64Binary"/>
<xs:any namespace="##other" processContents="lax" minOccurs="0"
maxOccurs="unbounded"/>
</xs:sequence>
</xs:choice>
</xs:complexType>


<xs:element name="SPKIData" type="ds:SPKIDataType"/>
<xs:complexType name="SPKIDataType">
<xs:sequence maxOccurs="unbounded">
<xs:element name="SPKISexp" type="xs:base64Binary"/>
<xs:any namespace="##other" processContents="lax" minOccurs="0"/>
</xs:sequence>
</xs:complexType>



<xs:element name="Object" type="ds:ObjectType"/>
<xs:complexType name="ObjectType" mixed="true">
<xs:sequence minOccurs="0" maxOccurs="unbounded">
<xs:any namespace="##any" processContents="lax"/>
</xs:sequence>
<xs:attribute name="Id" type="xs:ID" use="optional"/>
<xs:attribute name="MimeType" type="xs:string" use="optional"/> 
<xs:attribute name="Encoding" type="xs:anyURI" use="optional"/>
</xs:complexType>
<xs:element name="Manifest" type="ds:ManifestType"/>
<xs:complexType name="ManifestType">
<xs:sequence>
<xs:element ref="ds:Reference" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute name="Id" type="xs:ID" use="optional"/>
</xs:complexType>
<xs:element name="SignatureProperties" type="ds:SignaturePropertiesType"/>
<xs:complexType name="SignaturePropertiesType">
<xs:sequence>
<xs:element ref="ds:SignatureProperty" maxOccurs="unbounded"/>
</xs:sequence>
<xs:attribute name="Id" type="xs:ID" use="optional"/>
</xs:complexType>
<xs:element name="SignatureProperty" type="ds:SignaturePropertyType"/>
<xs:complexType name="SignaturePropertyType" mixed="true">
<xs:choice maxOccurs="unbounded">
<xs:any namespace="##other" processContents="lax"/>

</xs:choice>
<xs:attribute name="Target" type="xs:anyURI" use="required"/>
<xs:attribute name="Id" type="xs:ID" use="optional"/>
</xs:complexType>


<xs:simpleType name="HMACOutputLengthType">
<xs:restriction base="xs:integer"/>
</xs:simpleType>

<xs:element name="DSAKeyValue" type="ds:DSAKeyValueType"/>
<xs:complexType name="DSAKeyValueType">
<xs:sequence>
<xs:sequence minOccurs="0">
<xs:element name="P" type="ds:CryptoBinary"/>
<xs:element name="Q" type="ds:CryptoBinary"/>
</xs:sequence>
<xs:element name="G" type="ds:CryptoBinary" minOccurs="0"/>
<xs:element name="Y" type="ds:CryptoBinary"/>
<xs:element name="J" type="ds:CryptoBinary" minOccurs="0"/>
<xs:sequence minOccurs="0">
<xs:element name="Seed" type="ds:CryptoBinary"/>
<xs:element name="PgenCounter" type="ds:CryptoBinary"/>
</xs:sequence>
</xs:sequence>
</xs:complexType>
<xs:element name="RSAKeyValue" type="ds:RSAKeyValueType"/>
<xs:complexType name="RSAKeyValueType">
<xs:sequence>
<xs:element name="Modulus" type="ds:CryptoBinary"/>
<xs:element name="Exponent" type="ds:CryptoBinary"/>
</xs:sequence>
</xs:complexType>


</xs:schema>
===============================================================================
Code for registering the xml-schema
begin
dbms_xmlschema.deleteSchema('http://xmlns.oracle.com/xdb/schemas/DNTSB/www.sporfori.fo/schemas/www.w3.org/TR/xmldsig-core/xmldsig-core-schema.xsd',
dbms_xmlschema.DELETE_CASCADE_FORCE);
end;
begin
DBMS_XMLSCHEMA.REGISTERURI(
schemaurl => 'http://www.sporfori.fo/schemas/www.w3.org/TR/xmldsig-core/xmldsig-core-schema.xsd',
schemadocuri => 'http://www.sporfori.fo/schemas/www.w3.org/TR/xmldsig-core/xmldsig-core-schema.xsd',
local => TRUE,
gentypes => TRUE,
genbean => FALSE,
gentables => TRUE,
force => FALSE,
owner => 'DNTSB',
options => 0);
end;
Test program
-- Created on 17-07-2006 by EEJ
declare
XML_TEXT3 CLOB := '<Object xmlns="http://www.w3.org/2000/09/xmldsig#">
                              <SignatureProperties>
                                   <SignatureProperty Target="">
                                        <Timestamp xmlns="http://www.sporfori.fo/schemas/dnts/general/2006/11/14">2007-05-10T12:00:00-05:00</Timestamp>
                                   </SignatureProperty>
                              </SignatureProperties>
                         </Object>';
xmldoc xmltype;
begin
xmldoc := xmltype(xml_text3);
insert into signaturetable
(xml_document, ts)
values
(xmldoc, current_timestamp);
end;
Platform information
Operating system:
-bash-3.00$ uname -a
SunOS dntsdb 5.10 Generic_125101-09 i86pc i386 i86pc
SQLPlus:
SQL*Plus: Release 10.2.0.3.0 - Production on Fri Aug 17 00:15:13 2007
Copyright (c) 1982, 2006, Oracle. All Rights Reserved.
Enter password:
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - Production
With the Partitioning and Data Mining options
Kind Regards,
Eyðun

You should report this in a service request on http://metalink.oracle.com.
It is a shame that you put all the effort here to describe your problem, but on the other hand you can now also copy & paste the question to Oracle Support.
Because you are using 10.2.0.3; I am guessing that you have a valid service contract...

Problem deleting from table with xmltype column

Hi,
Using a standard, simple screen (generated from JHeadstart), I don't seem to be able to delete from a table including an xmltype column. I have tried it even with a very simple mock table with only one column, an xmltype column, and every time I check the "delete" box and click "save", I get the following error:
oracle.jbo.RowInconsistentException: JBO-25014: Another user has changed the row with primary key oracle.jbo.Key[33 ].
I have tried this in the JDeveloper application module tester too and the result is the same.
Is it possible to delete a row from a table with an xmltype column? Am I doing something wrong? Is there something special needs done?
As I say, I did this with a one-xmltype-column table using the "Business Components from Tables" wizard, accepting all the defaults.
Thanks,
Darren

In short you want
SELECT extractvalue(myxml, '/PurchaseOrder/Reference')
FROM dab_test;This difference is that for dab_xml, there are no columns defined for the table, therefore you are [OBJECT_VALUE|http://download.oracle.com/docs/cd/B28359_01/server.111/b28286/pseudocolumns006.htm#sthref830] as an alias for a non existent column.
With dab_test, you have a column that contains the XML so you need to use that column name instead of OBJECT_VALUE.

ORA-00904 on create table with xmltype column

Hi,
I am trying to create a table with syntax
CREATE TABLE ss_test(docid integer primary key, content varchar2(4000),acl XMLType)
XMLType column acl store as object relational
XMLSchema "acl.xsd" element "acl"
varray xmldata."ace" store as table ace_tab;
and getting ORA-00904.
acl.xsd is registered as
begin
dbms_xmlschema.registerschema('acl.xsd',
' <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
xmlns:xdb="http://xmlns.oracle.com/xdb">
<xs:element name="acl" xdb:SQLType="ACL_TYPE">
<xs:complexType>
<xs:sequence>
<xs:element name="ace" maxOccurs="100">
<xs:complexType>
<xs:attribute name="id" type="xs:integer"/>
</xs:complexType>
</xs:element>
</xs:sequence>
</xs:complexType>
</xs:element>
</xs:schema>',true,true,false,false);
end;
Couldnt figure out whats wrong with the syntax. Any pointers ?
Thanks,
Rakesh

Hmmmm ... I don't know if I should smile or frown with the implication that I am an OO guy :D :D
Most of my colleagues when I started working as a software engineer, treated me as too low-level because of my C background (started doing C in 1985).
In my last job, my colleagues hated my guts because I was asking them to squeeze every bit of performance out of C++ by using STL which is definitely not OO (although C++ is).
My current colleagues treat me as a DB guru (which I most definitely am not) and they overlook/forget the fact that most of them use Java libraries in their projects, that I wrote for them !
I am inclined to believe that I do not fall into any category in the end...
The only thing I am for sure - and I am proud of it - is inquisitive. I want to know everything there is about the tools I use, and so I end up spending hours and hours investigating... (Microsoft found that out the hard way when I filed 16 bug reports in 8 days when Visual C++ 6 came out ! Not that it hurt them though...)
This is where my confession ends (and my working on the XML validator starts...)
Καληνύχτα Marco
Philip (Φίλιππος in Greek)
PS: I did not follow the last solution anyway. I just wanted to verify its operability ;)

EXP/IMP..of table having LOB column to export and import using expdp/impdp

we have one table in that having colum LOB now this table LOB size is approx 550GB.
as per our knowldge LOB space can not be resused.so we have alrady rasied SR on that
we are come to clusion that we need to take backup of this table then truncate this table and then start import
we need help on bekow ponts.
1)we are taking backup with expdp using parellal parameter=4 this backup will complete sussessfully? any other parameter need to keep in expdp while takig backup.
2)once truncate done,does import will complete successfully..?
any SGA PGA or undo tablespace size or undo retention we need to increase.. to completer susecfully import? because its production Critical database?
current SGA 2GB
PGA 398MB
undo retention 1800
undo tbs 6GB
please any one give suggestion to perform activity without error...also suggest parameter need to keep during expdp/impdp
thanks an advance.

Hi,
From my experience be prepared for a long outage to do this - expdp is pretty quick at getting lobs out but very slow at getting them back in again - a lot of the speed optimizations that may datapump so excellent for normal objects are not available for lobs. You really need to test this somewhere first - can you not expdp from live and load into some test area - you don't need the whole database just the table/lob in question. You don;t want to find out after you truncate the table that its going to take 3 days to import back in....
You might want to consider DBMS_REDEFINITION instead?
Here you precreate a temporary table (with same definitiion as the existing one), load the data into it from the existing table and then do a dictionary switch to swap them over - giving you minimal downtime. I think this should work fine with LOBS at 10g but you should do some research and see if it works fine. You'll need a lot of extra tablespace (temporarily) for this approach though.
Regards,
Harry

How can we find size of a table having blob columns

I have a problem in which i need to get the size of table that ishaving BLOB column in it.
How to find the size?
for ex: i am having a table DocBlob which is having a BLOB column DocObject. How to get the size of DocBlob table?
Also how one can see the data of the BLOB column. In toad or Pl/Sql dev tool, we can not see anything. here we use to store the images in it. how we can verify that what image or data is stored in these columns??
thanks..

Tables are segments. LOB Segments are segments.
SELECT blocks or bytes FROM user_segments
You can also use dbms_lob.getlength to retrieve the length of a LOB.
http://www.morganslibrary.org/reference/dbms_lob.html

Getting an error while selecting from table having CLOB column.

Hi All,
I have below table created in My oracle database version Oracle Database 11g Enterprise Edition Release 11.2.0.1.0.
CREATE TABLE my_clob -- Dummy table created
(DataBody CLOB);
Current Database Character set - WE8MSWIN1250.
On the front end of my application, I have one form through which I can save/edit data in the above table. If I'm creating one new entry in the above table then it first check with existing record to avoid the duplicate entry and the this point application create the below select statement on the above table and return the error "ORA-00932: inconsistent data types: expected - got CLOB".
I can not change the sql statement.
SELECT * FROM my_clob WHERE databody IS NULL OR databody ='';
Even when I run the same statement on my DB server I’m getting the same error. Shown below
SQL> SELECT * FROM my_clob WHERE databody IS NULL OR databody ='';
SELECT * FROM my_clob WHERE databody IS NULL OR databody =''
ERROR at line 1:
ORA-00932: inconsistent datatypes: expected - got CLOB
SQL>
Is there anything with OraOLEDB which causing this error? Please help me out to get rid of this error.
Thanks,
Santosh

You cannot compare directly a CLOB column with a VARCHAR2 column. In your case you don't need to do such comparison because Oracle consider zero length strings as null values:
SQL> create table my_clob(data int, databody clob);
Table created.
SQL> insert into my_clob values(1, null);
1 row created.
SQL> insert into my_clob values(2, '');
1 row created.
SQL> commit;
Commit complete.
SQL> select * from my_clob where databody is null;
      DATA
DATABODY
         1
         2About null values in Oracle, please read http://docs.oracle.com/cd/E11882_01/server.112/e26088/sql_elements005.htm#SQLRF30037.

To Select Data from Mutiple Table having different column name

Dear All,
I have 100 tables under one user Operation, each table has column containg the code of the Data Entry Operator, But name of the column in each table is different.
Can anyone give the script to run from SQL PLUS so the we can find the total entry of each D.E. Operator per month.
Thanks and Regards,
Manoj

Perhaps the UNION ALL operator is what you want.
SELECT data_entry_operator, count(*) AS qty
FROM(
SELECT de_oper AS data_entry_operator FROM a
UNION ALL
SELECT d_e_operator FROM b
UNION ALL
SELECT d_e_op FROM c
GROUP BY data_entry_operator;

Query slow in table having XMLTYPE column

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