CLOB DataType: conversion with loss when migrating to WE8ISO8859P1 to AL32UTF8


We have an application data in a database of output 9.2.0.8 (characterset WE8ISO8859P1).

Now, the data must be migrated in a 11.2.0.3 output database (characterset AL32UTF8).

When you run the CSSCAN utility on the target (9.2.0.8) database I get the following result:

Table: MASTERCONTENT
Column: INFO
Type: CLOB
Number of Exceptions: 116
Size of data Conversion MAX Post: 1489532

ROWID Exception Type size cell Data (first 30 bytes)
------------------ ------------------ ----- ------------------------------
AAA4jBAAKAAACRcAAA conversion with loss
AAA4jBAAKAAACRcAAB conversion with loss
AAA4jBAAKAAAvNqAAA conversion with loss
AAA4jBAAKAABg0nAAC conversion with loss
AAA4jBAAKAABg0nAAE conversion with loss

...

From my understanding CLOB objects can store up to (4 gigabytes-1) * (the value of the LOB CHUNK storage parameter)

data of type character. Or is the problem that can not get the characters of certain lines converted AL32UTF8?

Currently, I do not understand why "lossy conversion" will happen...

Any help will be appreciated!

Rgds

Jan

"Lossy conversion" means that some codes of characters (bytes) the CLOB listed are not recognized as valid in WE8ISO8859P1. These codes are usually in the range 0 x 80-0x9f. You must take a look at these codes and try to guess what is their true meaning.  In most cases that meet Oracle customers, these illegal WE8ISO8859P1 are actually codes of WE8MSWIN1252 (WE8MSWIN1252 is a binary superset of WE8ISO8859P1). The solution is then to set the source game the good character of characters in database value and then export.

Thank you

Sergiusz

Tags: Database

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