The coded character set identifier (QCCSID) is used to specify the CCSID for i5/OS™.
As shipped, the CCSID is set to CCSID 65535. CCSID 65535 means that all character data tagging support on the system is turned off, which is not generally recommended.
If you use Java™, WebSphere®, or if you plan to transfer data between i5/OS and another client, then this value (or the corresponding value on the user profile) should be set to match the CCSID of your data. If the value is 65535, then the encoding of the data on the system is unknown.
If you leave this value at 65535, then you cannot get the results you expect when working from a client on the iSeries™, or the connection might not work at all.
You can change the coded character set identifier (QCCSID) system value. When you change this value, the default character set and code page system value (QCHRID) is changed to match the character set and code page of the coded character set identifier.
If a job is started with a single byte CCSID, (from either this value or the user profile value) then that job will not support double-byte language (DBCS) users.