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22 <strong>File</strong> <strong>Management</strong> V4R5<br />
LVLCHK(*NO) causes the system to omit the level identifier check when the file<br />
opens. For example, suppose that you add a field to the end of a record format in<br />
a database file, but the program does not use the new field. You can enter the<br />
Override with Database <strong>File</strong> (OVRDBF) command with LVLCHK(*NO) to enable<br />
the program to run without compiling again.<br />
There are several CL commands available to you to check the changes. You can use<br />
the Display <strong>File</strong> Field Description (DSPFFD) command to display the record-level<br />
and field-level descriptions or, if you have the source entry utility (SEU), you can<br />
display the source file containing the DDS for the file. You can display the format<br />
level identifier that is defined in the file by using the Display <strong>File</strong> Description<br />
(DSPFD) or the DSPFFD commands. The format level identifier which was used<br />
when the program was created can be displayed by the Display Program<br />
References (DSPPGMREF) command.<br />
There are also some changes to a file description that will not cause an error when<br />
the file opens. These happen because the record format identifiers did not change<br />
or because your program does not use the changed formats. You can add or<br />
remove formats from a file without affecting existing programs that do not use the<br />
added or deleted formats.<br />
Even though the level identifier does not change, some DDS functions that you<br />
add or delete could require changes in the logic of your program. You should<br />
review the functions you added or deleted to determine whether the program logic<br />
requires changes.<br />
Normally, the use of LVLCHK(*YES) is a good file integrity practice. The use of<br />
LVLCHK(*NO) can produce unpredictable results.<br />
Displaying information about open files<br />
You can display information about your open files in two ways:<br />
v Type dspjob option(*opnf) on any command line and press Enter.<br />
v Type wrkjob option(*opnf) on any command line and press Enter.<br />
The following screen displays:
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