Select clob column bogs down sqldeveloper GUI

Hi,
If I select a clob field, sqldeveloper completely slows down, taking seconds (many more than usual) for any GUI even.
i.e. this bogs down sqldeveloper:
select clob_col_name
from table_containing_clob_field;
I thought this may be a memory issue (as it could be downloading the whole clob, but I did not take time to verify). However even selecting one char from the clob column makes the sqldeveloper GUI lag
i.e. even this bogs down sqldeveloper:
select substr(clob_col_name, 1, 1)
from table_containing_clob_field;
Running select '' from dual; will bring the sqldeveloper GUI back to it's normal responsiveness.
IMO this is a bug, selecting 1 char from 30 records should not slow down every GUI event in the whole application.
Should I submit a bug or does anyone want to discuss this further?
Edited by: mdaly on Jul 8, 2009 6:09 PM

What version of the Oracle database?
- Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - Prod
How is the CLOB column stored? Inline or out of line?
- CREATE
TABLE "STYLESHEET"
"NAME" NVARCHAR2(60) NOT NULL ENABLE,
"VER" NUMBER NOT NULL ENABLE,
"STYLESHEET" CLOB NOT NULL ENABLE,
"DATEADDED" TIMESTAMP (6) DEFAULT SYSDATE NOT NULL ENABLE,
CONSTRAINT "STYLESHEET_NAME_PK" PRIMARY KEY ("NAME")
How large are the clobs?
- ~40kB
Why are you using Substringing one character of a CLOB does not mean that the entire clob from every column must be read into memory.
- I was using substr to test if sqldeveloper behaved the same when 1 character from the clob was selected versus not using any substr function.
Surely Oracle version or the way the clob is stored should not affect how the sqldeveloper GUI responds after a resultset is returned?

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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);
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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:
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SQL>
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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
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KEYWORDS     VARCHAR2(100)
CONTENT          CLOB
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Hello,
Specifically, this should be asked in the
ASP.Net MVC forum on forums.asp.net.
Karl
When you see answers and helpful posts, please click Vote As Helpful, Propose As Answer, and/or Mark As Answer.
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regards
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914451 wrote:
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Right????No.
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Hi all,
Am hitting an issue retrieving data > 8K (minus 1) stored in a CLOB column into a VARCHAR2 variable in PL/SQL...
The "problem to be solved" here is storing DDL, in this case a "CREATE VIEW" statement, that is longer than 8K for later retrieval (and execution) using dynamic SQL. Given that the EXECUTE IMMEDIATE statement can take a VARCHAR2 variable (up to 32K(-1)), this should suffice for our needs, however, it seems that somewhere in the process of converting this VARCHAR2 text to a CLOB for storage, and then retrieving the CLOB and attempting to put it back into a VARCHAR2 variable, it is throwing a standard ORA-06502 exception ("PL/SQL: numeric or value error"). Consider the following code:
set serveroutput on
drop table test1;
create table test1(col1 CLOB);
declare
cursor c1 is select col1 from test1;
myvar VARCHAR2(32000);
begin
myvar := '';
for i in 1..8192 loop
myvar := myvar || 'a';
end loop;
INSERT INTO test1 (col1) VALUES (myvar);
for arec in c1 loop
begin
myvar := arec.col1;
dbms_output.put_line('Read data of length ' || length(myvar));
exception when others then
dbms_output.put_line('Error reading data: ' || sqlerrm);
end;
end loop;
end;
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As far as the dynamic SQL issue goes, we can probably use the DBMS_SQL interface instead, with it's EXECUTE procedure that takes a PL/SQL array of varchar2(32K) - the only issue there is reading the data from the CLOB column, and then breaking that data into an array but that doesn't seem insurmountable. But this same basic issue (when a 9K text block, let's say, turns into a >32K block after being CLOBberred) seems to comes up in other text-processing situations also, so any ideas for how to resolve would be much appreciated.
Thanks for any tips/hints/ideas...
Jim

For those curious about this, here's the word from Oracle support (courtesy of Metalinks):
RESEARCH
========
Test the issue for different DB version and different characterset.
--Testing the following PL/SQL blocks by using direct assignment method(myvar := arec.col1;) on
different database version and different characterset.
SQL>create table test1(col1 CLOB);
--Inserting four CLOB data into test1.
declare
myvar VARCHAR2(32767);
begin
myvar := RPAD('a',4000);
INSERT INTO test1 (col1) VALUES (myvar);
myvar := RPAD('a',8191);
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myvar := RPAD('b',8192);
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myvar VARCHAR2(32767);
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===================================
1. If the database characterset is WE8ISO8859P1, then the above direct assignment
method(myvar := arec.col1;) works for database version 9i/10g/11g without any
errors.
2. If the database characterset is UTF8 or AL32UTF8, then the above direct assignment method(myvar := arec.col1;) will generate the "ORA-06502:
PL/SQL: numeric or value error" when the length of the CLOB data is greater
than 8191(=8K-1). The same error can be reproduced across all database versions
9i/10g/11g.
3. Using DBMS_LOB.READ(arec.col1, arec.len1, 1, myvar) method to read CLOB data into a VARCHAR2 variable works for both WE8ISO8859P1 and UTF8
characterset and for all database versions.
So - it seems as I'd surmised, UTF8 changes the way VARCHAR2 and CLOB data is handled. Not too surprising, I suppose - may you all be lucky enough to be able to stay away from this sort of issue. But - the DBMS_LOB.READ workaround is certainly sufficient for the text processing situations we find ourselves in currently.
Cheers,
Jim C.

Split CLOB column to improve performance

Hi All,
We have a transactional table which has 3 columns and one among those is CLOB which holds XML data.Inserts are coming at 35K/hr to this table and data will be deleted as soon as job is completed. So anytime the total records in this table will be less than 1000.
The XML data contains binary info of images and the size of each XML file ranges any where between 200KB to 600KB and the elapsed time for each insert varies from 1 to 2 secs depending upon the concurrency. As we need to achieve 125K/hour soon we were planning to do few modifications on table level.
1. Increase the CHUNK size from 8KB to 32KB.
2. Disabling logging for table,clob and index.
3. Disable flashback for database.
4. Move the table to a non default blocksize of 32KB. Default is 8KB
5. Increase the SDU value.
6. Split the XML data and store it on multiple CLOB columns.
We don't do any update to this table. Its only INSERT,SELECT and DELETE operations.
The major wait events I'm seeing during the insert is
1. direct path read
2. direct path write
3. flashback logfile sync
4. SQL*Net more data from client
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My doubt over here is ,
1. If I allocate a 2G memory for the non default block size and change the clob to CACHE, will my other objects in buffer_cache gets affected or gets aged out fast?
2. And moving this table to a SECUREFILE from BASICFILE will help?
3. Splitting the XML data to insert into different columns in the same table will give a performance boost?
Oracle EE 11.2.0.1,ASM
Thanks,
Arun

Thanks to all for the replies
@Sybrand
Please answer first whether the column is stored in a separate lobsegment.
No. Table,Index,LOB,LOB index uses the same TS. I missed adding this point( moving to separate TS) as part of table modifications.
@Hemant
There's a famous paper / blog post about CLOBs and Database Flashback. If I find it, I'll post the URL.
Is this the one you are referring to
http://laimisnd.wordpress.com/2011/03/25/lobs-and-flashback-database-performance/
By moving the CLOB column to different block size , I will test the performance improvement it gives and will share the results.
We dont need any data from this table. XML file contains details about finger prints and once the application server completes the job , XML data is deleted from this table.
So no need of backup/recovery operations for this table. Client will be able to replay the transactions if any problem occurs.
@Billy
We are not performing XML parsing on DB side. Gets the XML data from client -> insert into table -> client selects from table -> Upon successful completion of the Job from client ,XML data gets deleted.
Regarding binding of LOB from client side, will check on that side also to reduce round trips.
By changing the blocksize, I can keep db_32K_cache_size=2G and keep this table in CACHE. If I directly put my table to CACHE, it will age out all other operation from buffer which makes things worse for us.
This insert is part of transaction( Registration of a finger print) and this is the only statement taking time as of now compared to other statements in the transaction.
Thanks,
Arun

How to retreive soap xml data from clob column in a table

Hi,
I am trying to retrieve the XML tag value from clob column.
Table name = xyz and column= abc (clob datatype)
data stored in abc column is as below
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:head="http://www.abc.com/gcgi/shared/system/header" xmlns:v6="http://www.abc.com/gcgi/services/v6_0_0_0" xmlns:sys="http://www.abc.com/gcgi/shared/system/systemtypes">
<soapenv:Header xmlns:wsa="http://www.w3.org/2005/08/addressing">
<RqHeader soapenv:mustUnderstand="0" xmlns="http://www.abc.com/gcgi/shared/system/header">
<DateAndTimeStamp>2011-12-20T16:02:36.677+08:00</DateAndTimeStamp>
<UUID>1000002932</UUID>
<Version>6_0_0_0</Version>
<ClientDetails>
<Org>ABC</Org>
<OrgUnit>ABC</OrgUnit>
<ChannelID>HBK</ChannelID>
<TerminalID>0000</TerminalID>
<SrcCountryCode>SG</SrcCountryCode>
<DestCountryCode>SG</DestCountryCode>
<UserGroup>HBK</UserGroup>
</ClientDetails>
</RqHeader>
<wsa:Action>/SvcImpl/bank/
SOAPEndpoint/AlertsService.serviceagent/OpEndpointHTTP/AlertDeleteInq</wsa:Action></soapenv:Header>
<soapenv:Body>
<v6:AlertDeleteInqRq>
<v6:Base>
<v6:VID>20071209013112</v6:VID>

<v6:Ref>CTAA00000002644</v6:Ref>
</v6:Base>
</v6:AlertDeleteInqRq>
</soapenv:Body>
</soapenv:Envelope>
And i want to retrieve the values of tag
<ChannelID> and <v6:VID>
can somebody help, i have tried with extractvalue but not able to get the values

I have used the below two queries but not able to get the expected results. Both queries result into no values.
select xmltype(MED_REQ_PAYLOAD).extract('//ClientDetails/Org','xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" || xmlns="http://www.abc.com/gcgi/shared/system/header"').getStringValue() from ESB_OUTPUT_TEMP where SOAPACTION = '/SvcImpl/bank/alerts/v6_0_0_0/SOAPEndpoint/AlertsService.serviceagent/OpEndpointHTTP/AlertDeleteInq'
select EXTRACTVALUE(xmltype(MED_REQ_PAYLOAD),'/RqHeader/) from ESB_OUTPUT_TEMP where SOAPACTION = '/SvcImpl/bank/SOAPEndpoint/AlertsService.serviceagent/OpEndpointHTTP/AlertDeleteInq'
Well, for starters, both queries are syntactically wrong :
- non terminated string
- incorrect namespace mapping declaration
- unknown XMLType method "getStringValue()"
Secondly, all those functions are deprecated now.
Here's an up-to-date example using XMLTable. It will retrieve the two tag values you mentioned :
SQL> select x.*
2 from esb_output_temp t
3     , xmltable(
4         xmlnamespaces(
5           'http://schemas.xmlsoap.org/soap/envelope/' as "soap"
6         , 'http://www.abc.com/gcgi/shared/system/header' as "head"
7         , 'http://www.abc.com/gcgi/services/v6_0_0_0' as "v6"
8         )
9       , '/soap:Envelope'
10         passing xmlparse(document t.med_req_payload)
11         columns ChannelID varchar2(10) path 'soap:Header/head:RqHeader/head:ClientDetails/head:ChannelID'
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13       ) x
14 ;
CHANNELID VID
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Select clob column bogs down sqldeveloper GUI

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