CSSCAN(Character Set Scanner utility)是Oracle提供的一个用于检查字符集转换过程中可能会出现的数据丢失或者损坏的情况。也可以单独的扫描某些表某些列能否进行字符集转换，并且能够并行扫描以加快扫描速度。

D:\>csscan help=y

Character Set Scanner v2.1 : Release 10.2.0.0.0 – Production on 金 9月 21 13:51:
40 2018

Copyright (c) 1982, 2005, Oracle. All rights reserved.

You can let Scanner prompt you for parameters by entering the CSSCAN
command followed by your username/password:

Example: CSSCAN SYSTEM/MANAGER

Or, you can control how Scanner runs by entering the CSSCAN command
followed by various parameters. To specify parameters, you use keywords:

Example: CSSCAN SYSTEM/MANAGER FULL=y TOCHAR=utf8 ARRAY=1024000 PROCESS=3

Keyword Default Prompt Description
———- ——- —— ————————————————-
USERID yes username/password
FULL N yes scan entire database
USER yes owner of tables to be scanned
TABLE yes list of tables to scan
COLUMN yes list of columns to scan
EXCLUDE list of tables to exclude from scan
TOCHAR yes new database character set name
FROMCHAR current database character set name
TONCHAR new national character set name
FROMNCHAR current national character set name
ARRAY 1024000 yes size of array fetch buffer
PROCESS 1 yes number of concurrent scan process
MAXBLOCKS split table if block size exceed MAXBLOCKS
CAPTURE N capture convertible data
SUPPRESS maximum number of exceptions logged for each table
FEEDBACK report progress every N rows
BOUNDARIES list of column size boundaries for summary report
LASTRPT N generate report of the last database scan
LOG scan base file name of report files
PARFILE parameter file name
PRESERVE N preserve existing scan results
LCSD N no enable language and character set detection
LCSDDATA LOSSY no define the scope of the detection
HELP N show help screen (this screen)
QUERY N select clause to scan subset of tables or columns
———- ——- —— ————————————————-
Scanner terminated successfully.