The error "EXP-00056: ORACLE error 6502 encountered" looks like this
in export log files:
EXP-00056: ORACLE error 6502 encountered
ORA-06502: PL/SQL: numeric or value error
LPX-00210: expected '<' instead of 'n'
ORA-06512: at "SYS.UTL_XML", line 0
ORA-06512: at "SYS.DBMS_METADATA_INT", line 3296
ORA-06512: at "SYS.DBMS_METADATA_INT", line 4148
ORA-06512: at "SYS.DBMS_METADATA", line 458
ORA-06512: at "SYS.DBMS_METADATA", line 1156
ORA-06512: at "SYS.DBMS_METADATA", line 1141
ORA-06512: at line 1
Sometime this error will be due to invalid packages, and the first
step is to check:
select comp_id,
version, status from dba_registry;
The exp-00056 with the 6502 error happens under several
circumstances:
1 - Bugs - See Oracle patch Patch 3361288, and
MOSC note 334473.1. There may be missing XDB views;
select * from sys.metastylesheet;
If the stylesheet column shows "not
initialized" , there is a problem, and run this to fix:
SQL> @$ORACLE_HOME/rdbms/admin/initmeta.sql
2 - Conflicting releases - The target and local
databases must be on exactly the same release of Oracle. The
EXP-00056 with 6502 has happened when the target database is Oracle9i
Enterprise Edition Release 9.2.0.4.0. and local database is Oracle9i
Enterprise Edition Release 9.2.0.1.0.
3 - Using incorrect data type variables - Dave
Herring noted the EXP-00056 with 6502: " started getting the same error
after upgrading from 9.2.0.4 to 9.2.0.6, when setting a VARCHAR2(4000)
variable to output from DBMS_METADATA.GET_DDL ... I changed the
statement to do a SUBSTR(...1,4000) and that resolved it.
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