Error when the concatenation of CLOB using conversion implicit to_char

Hello

Please look at the code below (Oracle 11.1.0.7.0):
DECLARE
  c CLOB;
BEGIN
  FOR i IN 1..10
  LOOP
    -- Please uncomment ONE of the lines below
    c := c ||  LPAD('x', 8000, 'z') || i; -- raises error ora-06502
    --c := c || (LPAD('x', 8000, 'z') || i);  -- works
    --c := c ||  LPAD('x', 8000, 'z') || to_char(i);  -- works
  END LOOP;
END;
OK, making use of implicit type conversion may not be the best thing to do, but just out of curiosity, is there any explanation for this error to occur?

It seems that, when an implicit conversion is involved without the help of hooks, Oracle tries to convert all in varchar2 before concatenate in the clob, which causes the error.

Thank you
Luis

Hello
>
# 6.1, we have a clob and a varchar2, as in #2; Why Oracle has decided to convert the clob in varchar2 as you say, and not vice versa as in #3?
>

# 5, we have clob and number at the beginning. In order to evaluate the expression oracle requires that two variables was of the same type.
As the implicit conversion there is no number-> clob
but there are several-> varchar2 and clob-> varchar2 oracle choose this one.

Tags: Database

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    Hello

    Env: Oracle 11 2 Client (11.2.0.1) on Oracle Linux 5.8 GR 64 bit

    DB server: Oracle 11 g 2 (11.2.0.3.6) on Oracle Linux 6.2 64bits

    I have installed Oracle 11 GR 2 client on a server and created the tnsnames.ora with required entry.

    When I try to connect to the databases on the server of remote database using the suite in two ways, one of them give me error "ORA-12545". Do not know why.

    [oracle@server ~] $ sqlplus scott/tiger@proddb01

    SQL * more: Production of release 11.2.0.1.0 game Apr 10 12:24:58 2014

    Copyright (c) 1982, 2009, Oracle.  All rights reserved.

    Connected to:

    Oracle Database 11 g Enterprise Edition Release 11.2.0.3.0 - 64 bit Production

    With partitioning, OLAP, Data Mining and Real Application Testing options

    SQL > exit

    Disconnected from the database to Oracle 11 g Enterprise Edition Release 11.2.0.3.0 - 64 bit Production

    With partitioning, OLAP, Data Mining and Real Application Testing options

    [oracle@server ~] $ sqlplus

    SQL * more: Production of release 11.2.0.1.0 game Apr 10 12:25:04 2014

    Copyright (c) 1982, 2009, Oracle.  All rights reserved.

    Enter the user name: scott

    Enter the password:

    ERROR:

    ORA-12545: Connect failed because target host or object does not exist

    Enter the user name:

    Here's my env:

    [oracle@server ~] $ echo $ORACLE_SID

    PRODRD01

    [oracle@server ~] $ echo $ORACLE_HOME

    /opt/Oracle/app/product/11.2.0/Client_1

    [oracle@server ~] $

    Input TNS is:

    PRODRD01 =

    (DESCRIPTION =

    (ADDRESS = (PROTOCOL = TCP)(HOST = server.whatever.com) (PORT = 1521))

    (CONNECT_DATA =

    (SERVER = DEDICATED)

    (SERVICE_NAME = PRODRD01)

    )

    )

    I tried to replace the host name and IP address, I still got the same error. The host name of the server database and IP entry does not exist in the file "/ etc/hosts. Could this be the cause? I can't edit the file "/ etc/hosts" and I couldn't convince the sys-admin to add the hostname of Server DB and IP entry to this file.

    Clues please?

    Best regards

    user130038 wrote:

    Hello

    Env: Oracle 11 2 Client (11.2.0.1) on Oracle Linux 5.8 GR 64 bit

    DB server: Oracle 11 g 2 (11.2.0.3.6) on Oracle Linux 6.2 64bits

    I have installed Oracle 11 GR 2 client on a server and created the tnsnames.ora with required entry.

    When I try to connect to the databases on the server of remote database using the suite in two ways, one of them give me error "ORA-12545". Do not know why.

    [oracle@server ~] $ sqlplus scott/tiger@proddb01

    SQL * more: Production of release 11.2.0.1.0 game Apr 10 12:24:58 2014

    Copyright (c) 1982, 2009, Oracle.  All rights reserved.

    Connected to:

    Oracle Database 11 g Enterprise Edition Release 11.2.0.3.0 - 64 bit Production

    With partitioning, OLAP, Data Mining and Real Application Testing options

    SQL > exit

    Disconnected from the database to Oracle 11 g Enterprise Edition Release 11.2.0.3.0 - 64 bit Production

    With partitioning, OLAP, Data Mining and Real Application Testing options

    [oracle@server ~] $ sqlplus

    SQL * more: Production of release 11.2.0.1.0 game Apr 10 12:25:04 2014

    Copyright (c) 1982, 2009, Oracle.  All rights reserved.

    Enter the user name: scott

    Enter the password:

    ERROR:

    ORA-12545: Connect failed because target host or object does not exist

    Enter the user name:

    Here's my env:

    [oracle@server ~] $ echo $ORACLE_SID

    PRODRD01

    [oracle@server ~] $ echo $ORACLE_HOME

    /opt/Oracle/app/product/11.2.0/Client_1

    [oracle@server ~] $

    Input TNS is:

    PRODRD01 =

    (DESCRIPTION =

    (ADDRESS = (PROTOCOL = TCP)(HOST = server.whatever.com) (PORT = 1521))

    (CONNECT_DATA =

    (SERVER = DEDICATED)

    (SERVICE_NAME = PRODRD01)

    )

    )

    I tried to replace the host name and IP address, I still got the same error. The host name of the server database and IP entry does not exist in the file "/ etc/hosts. Could this be the cause? I can't edit the file "/ etc/hosts" and I couldn't convince the sys-admin to add the hostname of Server DB and IP entry to this file.

    Clues please?

    Best regards

    When '@proddb01' is not used, then sqlplus can only connect to a local database, & there is no local database on the client system

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