Home » SQL & PL/SQL » SQL & PL/SQL » How can I load 300k of data into a CLOB (OEL 5, Oracle 11.2.0.3.0)
How can I load 300k of data into a CLOB [message #653976] Sun, 24 July 2016 14:56 Go to next message
Andrey_R
Messages: 441
Registered: January 2012
Location: Israel
Senior Member
Hi all,
I have a 300k char long string received from the application, and have to break it down into workable chunks ( 32k).
Is there a way to do it ?

In PL/SQL Developer, I am trying:

declare
  l_varchar varchar2(32000);
  l_clob    clob := '123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123,123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--300k char long string
begin
  l_varchar := dbms_lob.substr(l_clob, 32000, 1);
  dbms_output.put_line(l_varchar);
end;


I get an error:

"ORA-06550: line 2, column 18:
PLS-00172: string literal too long"

Thanks in advance for your kind assistance.

Regards,
Andrey

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Re: How can I load 300k of data into a CLOB [message #653977 is a reply to message #653976] Sun, 24 July 2016 15:08 Go to previous messageGo to next message
BlackSwan
Messages: 26766
Registered: January 2009
Location: SoCal
Senior Member
populate "small" LOB with string of length 32765
inside LOOP do DBMS_LOB.APPEND multiple times to conctruct LOB of desire length

http://docs.oracle.com/database/121/ARPLS/d_lob.htm#ARPLS66624

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Re: How can I load 300k of data into a CLOB [message #653978 is a reply to message #653977] Sun, 24 July 2016 15:22 Go to previous messageGo to next message
Andrey_R
Messages: 441
Registered: January 2012
Location: Israel
Senior Member
BlackSwan wrote on Sun, 24 July 2016 23:08
populate "small" LOB with string of length 32765
inside LOOP do DBMS_LOB.APPEND multiple times to conctruct LOB of desire length

http://docs.oracle.com/database/121/ARPLS/d_lob.htm#ARPLS66624


Thanks, I've checked it out.
Also looked into a previous questions in:
http://www.orafaq.com/forum/t/152129/

The thing is, that in those examples you artificially pump up a initially empty clob var.
What I have is the application submitting the 300k char to me, so I receive the error and can't do *anything*.
This is about *breaking it down*, not building it up from inside...

From your answers I get that I cannot do anything with a 300k string handed to me initially , is that so Sad ?

Regards,
Andrey

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Re: How can I load 300k of data into a CLOB [message #653979 is a reply to message #653978] Sun, 24 July 2016 15:30 Go to previous messageGo to next message
BlackSwan
Messages: 26766
Registered: January 2009
Location: SoCal
Senior Member
in SQL string length limit is 4000
in PL/SQL string length limit is 32765
CLOB datatype length "BIG"
Your input must be mapped to a CLOB datatype column; not any VARCHAR2 column.

You claim, but never SHOW us, that you have 300K character something other.
You can reverse the process to chop up a CLOB into smaller pieces by extracting into VARCHAR2(32000).
YMMV!

Please read and follow the forum guidelines, to enable us to help you:
OraFAQ Forum Guide
How to use {code} tags and make your code easier to read

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Re: How can I load 300k of data into a CLOB [message #653980 is a reply to message #653979] Sun, 24 July 2016 15:36 Go to previous messageGo to next message
Andrey_R
Messages: 441
Registered: January 2012
Location: Israel
Senior Member
BlackSwan wrote on Sun, 24 July 2016 23:30
in SQL string length limit is 4000
in PL/SQL string length limit is 32765
CLOB datatype length "BIG"
Your input must be mapped to a CLOB datatype column; not any VARCHAR2 column.

You claim, but never SHOW us, that you have 300K character something other.
You can reverse the process to chop up a CLOB into smaller pieces by extracting into VARCHAR2(32000).
YMMV!

Please read and follow the forum guidelines, to enable us to help you:
OraFAQ Forum Guide
How to use {code} tags and make your code easier to read


No means to disrespect, but I did *SHOW* you, that's why the scroll bar is so wide at the bottom of your browser.
It is actually you who haven't *SHOWN* anything.
I am not saying you owe me anything, and I appreciate anyone's time and effort here, however, I really don't understand what is missing, and why are you so upset about what you imply as my lack of cooperation..


How can I help you help me ?
I posted my code, I explained my conditions, I need to break down 300k of character data into smaller chunks - I can't even dbms_output.put_line('Hello world') because I get an error about the string length.

Any explanation?
Regards,
Andrey

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Re: How can I load 300k of data into a CLOB [message #653981 is a reply to message #653980] Sun, 24 July 2016 15:41 Go to previous messageGo to next message
John Watson
Messages: 8989
Registered: January 2010
Location: Global Village
Senior Member
From where is this 300KB string coming? Your application is not typing into a SQL*Plus session.

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Re: How can I load 300k of data into a CLOB [message #653982 is a reply to message #653981] Sun, 24 July 2016 15:45 Go to previous messageGo to next message
Andrey_R
Messages: 441
Registered: January 2012
Location: Israel
Senior Member
John Watson wrote on Sun, 24 July 2016 23:41
From where is this 300KB string coming? Your application is not typing into a SQL*Plus session.


No it's not.
From a C++ based application interface. It Builds up a string of comma separated id's.
Yes we will attend to breaking it up into 32k chunks and re-arranging my PL/SQL code accordingly if we don't have another choice,
But it's costly, so I would like to make sure there isn't another way around this, that the 300k string cannot be anyhow handled by PL/SQL as a in parameter's init data.

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Re: How can I load 300k of data into a CLOB [message #653983 is a reply to message #653982] Sun, 24 July 2016 16:01 Go to previous messageGo to next message
BlackSwan
Messages: 26766
Registered: January 2009
Location: SoCal
Senior Member
>that the 300k string cannot be anyhow handled by PL/SQL as a in parameter's init data.
CLOB datatype

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Re: How can I load 300k of data into a CLOB [message #653984 is a reply to message #653983] Sun, 24 July 2016 16:02 Go to previous messageGo to next message
Andrey_R
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BlackSwan wrote on Mon, 25 July 2016 00:01
>that the 300k string cannot be anyhow handled by PL/SQL as a in parameter's init data.
CLOB datatype



Can you elaborate please ?

Andrey

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Re: How can I load 300k of data into a CLOB [message #653985 is a reply to message #653984] Sun, 24 July 2016 16:04 Go to previous messageGo to next message
BlackSwan
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https://www.google.com/webhp?hl=en&tab=ww#hl=en&q=pl+sql+procedure+clob+parameter

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Re: How can I load 300k of data into a CLOB [message #654002 is a reply to message #653984] Mon, 25 July 2016 03:51 Go to previous messageGo to next message
pablolee
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Andrey_R wrote on Sun, 24 July 2016 22:02
BlackSwan wrote on Mon, 25 July 2016 00:01
>that the 300k string cannot be anyhow handled by PL/SQL as a in parameter's init data.
CLOB datatype



Can you elaborate please ?

Andrey


To further elaborate on BS's advice, the issue is not the loading of the clob per se, it is the fact that you are using a string literal (in the example given) that is the issue.
i.e. you cannot put more that 32,767 characters between 2 apostrophes (not without an error anyway). If you pass the 300k as a CLOB from the C++ application to to PL/SQL procedure you will circumvent that issue.

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Re: How can I load 300k of data into a CLOB [message #654003 is a reply to message #653984] Mon, 25 July 2016 04:02 Go to previous messageGo to next message
John Watson
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OCCI has datatypes for managing CLOBs, I am not familiar with them but your developers will be. Or should be.
If you want to continue with developing the database side of the application while they sort themselves out,
you could save your 300KB string to a file and read it into a CLOB. That should give you a simulation you
can use for now.

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Re: How can I load 300k of data into a CLOB [message #654027 is a reply to message #654003] Mon, 25 July 2016 12:06 Go to previous messageGo to next message
Andrey_R
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Registered: January 2012
Location: Israel
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Update, it was indeed an issue in the C++ application, and I was using a string to immitate it, which was wrong, I got it now.

Thanks everyone for your kind help!

Regards,
Andrey

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Re: How can I load 300k of data into a CLOB [message #654028 is a reply to message #654027] Mon, 25 July 2016 15:00 Go to previous message
Bill B
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Registered: December 2004
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The absolute slowest and worst way you can handle a bunch of comma separated id's.is to store them in a single string. Put them in as records into a
daughter table and everything will work MUCH better. A column should never have multiple bits of data in it.

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