Accessing CLOBs in Oracle 8i

From the research i've done, it seems that there are two ways to access CLOBs in Oracle 8i: InputStream or Reader.
The InputStream method uses byte streams and the Reader uses character streams.
Is that correct? I haven't been able to determine the pros/cons of the two approaches. Can anyone shed some light on this for me?

Jack Shirazi claims in his book, "Java Performance Tuning", that in most situations Readers provide better performance than InputStreams.
Read the section, "From Raw I/O to Smokin' I/O", in Chapter 8 for details.

Similar Messages

Using dblinks to access CLOB datatype

Hi ,
I am using dblink to access data data from remote database. I need to access data form a table on remote database which have fields of type VARCHAR2 and CLOB. Since I can't access CLOB data directly through dblinks, i created a view for that CLOB datatype. Now when I try to retrieve the data from remote tab1 by joining that view and tab1 ,I am getting the error
ORA-22992: cannot use LOB locators selected from remote tables .
But if I retrieve the data from view alone, I am able to retrieve the information.
And if try to access the varchar2 field alone using dblinks that also will work. But if I combine both the view and same table used in that view, it doesn't work.
I think this can be solved by puting all the required fields(CLOB and non-CLOB) in view. In real situation, the number of fileds that will not have CLOB datatype in tab1 is high.
Can someone tell some suggestion on how to resolve this?
Thanks in Advamce,
Dalia

I assume that you likely do not have Metalink (Oracle Support) access. Here is the Metalink Note on this topic.
Subject: ORA-22992 When Trying To Select Lob Columns Over A Database Link
Doc ID:   Note:119897.1
Type:      BULLETIN
Last Revision Date:      24-JUL-2002
Status: PUBLISHED
PURPOSE
This document discusses whether or not a lob column can be selected over a
remote database link.
SCOPE & APPLICATION
This document is written for all audiences.
This information is based on the tests made in Oracle 8.1.5 and Oracle 8.1.6
and the available Oracle documentation on LOB (large Object) data and issues
logged with Development on the select of a LOB column over a remote database
link.
How to select a LOB column over a database link?
(A) You cannot actually select a lob column (i.e. CLOB column) from a table
     using remote database link. This is not a supported feature.
For example,
You run the following command from the local instance to a remote database
instance called R816 over a dblink R816 created in the local instance for user
SCOTT. You have logged in as user Scott and the remote table CLOBT has 2
columns C1 and C2 as below:
$ sqlplus scott/tiger@r816utf8
SQL> create database link r816
      connect to scott identified by tiger
      using 'rtcsol1_r816.us.oracle.com';
SQL> desc clobt@r816
      Name                          NUll?    Type
      C1                            NOT NULL NUMBER
      C2                                     CLOB
SQL> select c1, c2
       from clobt@R816;
       ORA-22992: cannot use LOB locators selected from remote tables
SQL> select c1, dbms_lob.getlength(c2)
       from clobt@R816;
       ORA-22992: cannot use LOB locators selected from remote tables
Error: ORA-22992
Text:   cannot use LOB locators selected from remote tables
Cause: A remote LOB column cannot be referenced.
Action: Remove references to LOBs in remote tables.
(B) Also, these are the INVALID operations on a LOB column:
     1. SELECT lobcol from table1@remote_site;
     2. INSERT INTO lobtable select type1.lobattr from table1@remote_site;
     3. SELECT dbms_lob.getlength(lobcol) from table1@remote_site;
In short, you cannot select a lob column using remote dblink. You have to use
DBMS_LOB package in a programming language like PL/SQL, JAVA to manipulate LOB
data.
RELATED DOCUMENTS
Oracle8i Application Developer's Guide - Large Objects (LOBs) Release 2 (8.1.6)
Chapter Managing LOBs: LOB Restrictions

Oracle Streams b/w MS-Access 2007 and Oracle 10g.

Can we set up Oracle Streams between MS-Access 2007 and Oracle 10g? Ms-Access as source and Oracle 10g as destination database. If so, can any one please give me little heads up with supported doc's or any source of info.

Help Help....!!!

MS Access 2000 and Oracle 8

Hello,
I need to provide access to a Oracle (v 8) table via MS Access 2000. I am doing so via Link Tables in MS Access.
But I am not able to see the new tables that I created, in the list of tables available for linking from the Oracle schema, in Access.
How can I rectify this?
Thank you.
Raj
Message was edited by:
user492218

I think you'd need to contact Oracle support to get access to older versions of the driver.
Since 8.0.5 isn't supported any longer, however, is it possible for you to update your Oracle client to one of the supported releases-- 8.1.7 or 9i?
Justin

How can i view the data from Access DB in oracle

pls tell me that how can i view the data of MS ACCESS DATABASE in ORACLE.i was use ODBC of ACCESS DATABASE AND THEN CREATE DATABASE LINK IN ORACLE BUT NOT YET SUCCEEDED.PLS TELL ME THE PROCEDURE.
regard's

hi,
u nedd to use Oracle Hetrogeneous Services,,
full details of the procedure u may fing on metalink
Regards

Error While reading CLOB from Oracle using WebLogic Connection Pool, Works fine with out using pool

PROBLEM DESCRIPTION :
     When I try to read a clob from Oracle, I receive "ORA-03120: two-task
conversion routine: integer overflow" Error.
     This error occurs only for CLOB Type and only if I try to connect to
Oracle using WebLogic JDriver/Oracle POOL.
     IMPORTANT NOTE: I can read CLOB or any other data using direct JDBC
connection to ORacle with out any problem.
     Below Please find the JAVA CODE for Both Working and NON Working .
Created a Connection Pool as:
Name: MyJDBCConnectionPool
URL : jdbc:weblogic:oracle
DIRVER:weblogic.jdbc.oci.Driver
NON WORKING JAVA CODE (USES WEBLOGIC JDBC CONNECTION POOL TO ORACLE):
Driver myDriver =
(Driver)Class.forName("weblogic.jdbc.pool.Driver").newInstance();
Connection mconn =
myDriver.connect("jdbc:weblogic:pool:MyJDBCConnectionPool",null);
mconn.setAutoCommit (false);
CallableStatement cs = mconn.prepareCall("{call
P_XMLTEST2(?)}"); //This returns a CLOB
cs.registerOutParameter(1,java.sql.Types.CLOB);
cs.execute();
Clob clob = null;
clob = cs.getClob(1);
String data =new String();
data = clob.getSubString(1, (int)clob.length());
System.out.println(data); //print the data
data = null;
clob=null;
cs.close();
WORKING JAVA CODE (USES DIRECT THIN JDBC CONNECTION TO ORACLE):
Driver myDriver =
(Driver)Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
Connection mconn =
myDriver.connect("jdbc:oracle:thin:@server:1521:DB",null);
mconn.setAutoCommit (false);
CallableStatement cs = mconn.prepareCall("{call
P_XMLTEST2(?)}"); //This returns a CLOB
cs.registerOutParameter(1,java.sql.Types.CLOB);
cs.execute();
Clob clob = null;
clob = cs.getClob(1);
String data =new String();
data = clob.getSubString(1, (int)clob.length());
System.out.println(data); //print the data
data = null;
clob=null;
cs.close();
ERROR MESSAGE:
     ORA-03120: two-task conversion routine: integer overflow
I appreciate your help on this problem.

PROBLEM DESCRIPTION :
     When I try to read a clob from Oracle, I receive "ORA-03120: two-task
conversion routine: integer overflow" Error.
     This error occurs only for CLOB Type and only if I try to connect to
Oracle using WebLogic JDriver/Oracle POOL.
     IMPORTANT NOTE: I can read CLOB or any other data using direct JDBC
connection to ORacle with out any problem.
     Below Please find the JAVA CODE for Both Working and NON Working .
Created a Connection Pool as:
Name: MyJDBCConnectionPool
URL : jdbc:weblogic:oracle
DIRVER:weblogic.jdbc.oci.Driver
NON WORKING JAVA CODE (USES WEBLOGIC JDBC CONNECTION POOL TO ORACLE):
Driver myDriver =
(Driver)Class.forName("weblogic.jdbc.pool.Driver").newInstance();
Connection mconn =
myDriver.connect("jdbc:weblogic:pool:MyJDBCConnectionPool",null);
mconn.setAutoCommit (false);
CallableStatement cs = mconn.prepareCall("{call
P_XMLTEST2(?)}"); //This returns a CLOB
cs.registerOutParameter(1,java.sql.Types.CLOB);
cs.execute();
Clob clob = null;
clob = cs.getClob(1);
String data =new String();
data = clob.getSubString(1, (int)clob.length());
System.out.println(data); //print the data
data = null;
clob=null;
cs.close();
WORKING JAVA CODE (USES DIRECT THIN JDBC CONNECTION TO ORACLE):
Driver myDriver =
(Driver)Class.forName("oracle.jdbc.driver.OracleDriver").newInstance();
Connection mconn =
myDriver.connect("jdbc:oracle:thin:@server:1521:DB",null);
mconn.setAutoCommit (false);
CallableStatement cs = mconn.prepareCall("{call
P_XMLTEST2(?)}"); //This returns a CLOB
cs.registerOutParameter(1,java.sql.Types.CLOB);
cs.execute();
Clob clob = null;
clob = cs.getClob(1);
String data =new String();
data = clob.getSubString(1, (int)clob.length());
System.out.println(data); //print the data
data = null;
clob=null;
cs.close();
ERROR MESSAGE:
     ORA-03120: two-task conversion routine: integer overflow
I appreciate your help on this problem.

How to find users machine / IP who is accessing forms through Oracle AS

Dear Gurus
We need to know the users machine / IP who are accessing forms through Oracle 9i Application Server, how can we find that?
thanks in advance
regards
Mehmood

Mehmood,
Set serverURL=/forms90/f90servlet/session in the Forms Web configuration default section or add it to the URL to start tracing host name and ip-addresses from clients. The output appears in the servlet log file application.log. sessionperf , perf and debug are the other options instead of session.
regards,
Bernhard Jongejan
http://bernhardjongejan.spaces.live.com

How to export a table of data from MS Access 2007 to Oracle 11g

I have been looking all over trying to find a way to get a table from Access 2007 to Oracle 11g. I tried using the export options in Access but can't get them setup correctly I guess. What are the steps to setting this up correctly or is there another way to export the data?

MS Access 2007 DB migration To oracle 10g

How can I get the content of clob in oracle db?

In jsp,if I want to get the characters from CLOB column in ORACLE DataBase,what should I do?
I am waiting for the answer hurrily.Thank you!

import these two classes:
import oracle.sql.CLOB;
import oracle.jdbc.driver.OracleResultSet;To retrieve the clob, use
              ResultSet rs;
                  get the rs from database
              int i = 1; // this is the column Index in the rs
              CLOB cl = ((OracleResultSet)rs).getCLOB(i);
              int len = (int)cl.length();
              String str = cl.getSubString(1,len);

MS Access Crosstab to Oracle SQL

Gurus,
I am trying to convert MS Access Query to Oracle SQL, What would be the Oracle query for this MS Access Crosstab Query?
I am working on Oracle 10g so, I can't take advantage of oracle PIVOT function.
Thank you
Edited by: 951334 on Aug 10, 2012 6:52 AM
Edited by: 951334 on Aug 13, 2012 5:51 AM

if your crosstab columns are static you can use well-known technique like
select tablespace_name,
sum(case segment_type when 'TABLE' then bytes end) TABLES_BYTES,
sum(case segment_type when 'INDEX' then bytes end) INDEXES_BYTES,
sum(case segment_type when 'LOBSEGMENT' then bytes end) LOB_BYTES
from dba_segments
group by tablespace_name;
for dynamic crosstab columns you require to build this query dynamically in application

How Offiline Data loading is possible from MS Access DB to Oracle DM

HI All,
I am new to Oracle.
I am trying to migrate few tables from MS Access DB to Oracle DB (10g)
I have used the migration utility from the Sql Developer tool.
I was successful in creating the schema and also transferring the data for tables.
But if my data in Access DB is updated everyday then how am i suppose to link this to newly created oracle tables?
Is there any way to do this?
And if i want to load the Oracle tables offline using "Generate Offline Data Move Scripts" option in sql developer then how do i do it?
I tried using the option "Generate Data Move Scripts" right click option on converted object then the utility created few files on my local machine.
I am not able to make my way fwd.
Please help me.
regards,
Sushil

Hi Sushil,
I will try to address each of your questions:
Q: "if my data in Access DB is updated everyday then how am i suppose to link this to newly created oracle tables? Is there any way to do this?"
A: Depending on your reasons for maintaining the use of the MS Access database, you have two options.
1. lf you are continuing to use the MS Access database because the application front end is MS Access forms & reports then you could just create linked tables to the newly migrated Oracle tables. Doing so will mean that any data modified via the frond end forms & reports will be saved directly in the Oracle database.
2. If you wish to continue saving data to the MS Access database, then transfer it to the Oracle database, then you can just use the "Migrate Data" option in Oracle SQL Developer Migration Workbench to carry out this task. You just need to ensure that you've an open connection to your migration repository, and have the converted model for the migrated database. You will then just transfer the data online, like you have already done.
Q: "And if i want to load the Oracle tables offline using "Generate Offline Data Move Scripts" option in sql developer then how do i do it?"
A: To migrate your MS Access data offline, you need to do the following:
1. Run the Exporter tool for MS Access, and select the "Export for Oracle SQL Developer" option. On the second screen of the tool, browse to the location of your MDB file, provide a location for the output directory and ensure you select the "Export Table Data" option before you click the "Export" button. This option generates a .DAT file for each table containing data in your MDB file.
2. In Oracle SQL Developer, once you have carried out your migration, select the Migration > Script Generation > Generate Data Move Scripts menu item and select the Converted Model to generate the scripts for. An "MSAccess" folder will be generated in the path specified in the "Generate Offline Data Move Files" dialog.
3. Navigate to the "MSAccess" folder generated in step 2, and this folder should contain a "oracle_ctl.bat" file, which
for your converted model.
4. Edit the "oracle_ctl.bat" file and update the script to replace <Username>/<Password> with the actual username/password combination required to connect to the migrated schema e.g. for a migrated Northwind database, this combination would be northwind/northwind. Save the changes to the file.
5. Copy the .DAT files generated in step 1 to the /MSAccess/Oracle folder. The .ctl files refer to the .DAT file in order to load the data into Oracle using SQL*Loader.
6. Open each of the .ctl files and check the file name referenced on the 2nd line of the file e.g. infile '[Categories].null', where the file name is "Categories.null". The ".null" part must be updated to ".dat". This is a known issue and a fix for this will be available in a future release of the Oracle SQL Developer Migration Workbench. Save the changes to the .ctl files.
7. Open up a Command Prompt & navigate to the /MSAccess folder, and run the "oracle_ctl.bat" file to load the data into the Oracle database tables. If you experience any issues during this process, check the output in the command prompt & try to resolve any reported issues. If you are unable to do so, please refer to the Migration Workbench forum - Database and Application Migrations If you cannot find a solution from the existing threads, please post a new thread, giving the full syntax of any reported error messages.
I hope this helps.
Regards,
Hilary

Importing Access Data into Oracle Forms through Forms 10g

Sirs,
How can i import the data of Access file into Oracle tables.
i have the tables in access of approx 10 how can it be imported in oracle with same data structure.
ThanX in advance

DECLARE
kAccess client_ole2.obj_type;
kdb client_ole2.obj_type;
ktables client_ole2.obj_type;
krec client_ole2.obj_type;
kcurr client_ole2.obj_type;
begin
kaccess:=client_ole2.create_obj('Access.application);
kdb:=client_ole2.invoke_obj(kaccess,'open','D:\acc.mdb');
ktables:=client_ole2.get_obj_property(kdb,'tables',1);
//then process teh data of the table which is at 1 using another
krec:=client_ole2.invoke_obj(ktables,'count');
for s in 1 .. krec
loop
/// code for sinserting the current records data into the oracle tables.
kcurr:=client_ole2.get_obj_type(ktables,'recordset',s);
// then access each filed in kcurr and then insert in oracle table
end loop;
end;
the above code is not tested your can alter any syntatical error if any.

Upload data from Access Database to Oracle Database In oracle 8i

hi everybody
i am trying upload data from Access database to Oracle Database
i have TT(F1,F2,F3) table in Access Databsse
and emp(ename,ecode,sal) in oracle Database
db_ac is my datasource name
when i connect to Access Database thru this command this show following error
SQL> connect a/a@odbc:db_ac;
ORA-00022: invalid session id; access denied
ORA-00022: invalid session id; access denied
ORA-00022: invalid session id; access denied
Error accessing PRODUCT_USER_PROFILE
Warning: Product user profile information not loaded!
You may need to run PUPBLD.SQL as SYSTEM
Server not available or version too low for this feature
ORA-00022: invalid session id; access denied
Connected.
when i am trying copy data as this command it show error and data not copied.
SQL> COPY FROM A/A@ODBC:DB_AC TO test/test@ora INSERT EMP USING SELECT F1,F2,F3 FROM TT;
Array fetch/bind size is 15. (arraysize is 15)
Will commit when done. (copycommit is 0)
Maximum long size is 80. (long is 80)
ORA-00022: invalid session id; access denied
ERROR:
OCA-00022: general OCA error
can help me .
with thanx

Hi there, 
 
Please kindly use instead the Database Forum at:- 
General Database Discussions 
 
... to place your question as this is for the Oracle Portal product Export / Import functionality. 
 
 
Kind regards, 
Pedro.

Converting Varchar into Clob in Oracle 8i

Hi All,
Kindly tell me how can we convert a varchar variable into a Clob in Oracle 8i inside a stored procedure. I searched alot on the net, we have a To_Clob function available from 9i but doesn't exist in 8i. There was also talk about using dbms_lob, but i dont know how to use that to convert it.
Kindly provide me with the details of how to do this as I am just starting out with Oracle.
Thanks in Advance,
Sajid.

Hi,
You can use the dbms_lob.to_clob() function(In oracle8i).
In oracle 9i it is not required.
Thanks & Regards
venkata

Copy access data into oracle with form builder 9i

hello
i need to copy/import data and tables from an MS access database into oracle 9i database. the situation is each time i login to my forms applicatin i will need to do that. any idea pls...
the access db is frequently updated. so when i login into my forms application it needs to be reimport the data from access db. can any1 pls help me?

To my opinion, there are 3 potential approaches :
1. rewrite the application, that data are stored directly in the oracle database
or the program writes flat files somewhere to the file system which are able getting
imported from the target instance on daily basis or job driven;
2. The "Access-driven approach" : link oracle tables into the MS-Access application
using an ODBC-connection and build a macro in Access which is exporting the stuff to
the target instance; in order to do so, the Oracle Client and ODBC-Drivers needs to
get installed on the PC where MS-Access is started to start the exportation process
(which is probably yours).
You may then create tables in the target instance and link them from within Access
using ODBC as the datasource
3. The "Oracle driven approach". explained in detail here, never tried it, but maybe
worth a look
http://www.orafaq.com/node/60
Basically, install the Oracle Software on a PC, configure an ODBC-Connection and start a
Listener there;
The target instance (which may no run on a UNIX system) is now able to commuincate
with the local running listener on your PC which itself is instantiating a connection to
the Access "Database" using the ODBC-Connection.
In this way, your PC acts as a database server from the Oracle Net point of view.
In theory, this could even work, depending on the ability to connect from the
instance server directly to the given IP of your PC (Security ?? Hmmmz)

Accessing CLOBs in Oracle 8i

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