Longchunksize Instead of Long Dictates Display Length of LOBs (Doc ID 353764.1)

Last updated on FEBRUARY 27, 2025

Applies to:

Symptoms

SET LONGCHUNKSIZE dictates the display length of a LONG / CLOB, when it should be SET LONG.

The steps to reproduce are:
SQL> SET LONGCHUNKSIZE 80
SQL> SET LONG 132
SQL> SET LINES 132
SQL> SELECT TO_CLOB(LPAD('X', 100, 'X')) FROM dual;

TO_CLOB(LPAD('X',100,'X'))
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXX

From Oracle9i documentation, Release 2 (9.2).

https://docs.oracle.com/cd/B10501_01/server.920/a90842/ch13.htm#1012703

SET LONG {80|n}
Sets maximum width (in bytes) for displaying CLOB, LONG, NCLOB and XMLType values; and for copying LONG values. The maximum value of n is 2 gigabytes.

https://docs.oracle.com/cd/B10501_01/server.920/a90842/ch13.htm#1012724

SET LONGC[HUNKSIZE] {80|n}
Sets the size (in bytes) of the increments SQL*Plus uses to retrieve a CLOB, LONG, NCLOB or XMLType value.

So SET LONGCHUNKSIZE should not limit the  display length of a LONG / CLOB.

Cause

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