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3. Given the DOS Specification below and the following
information:
• Indicator 50 is off
• No records have been written to the subfile
What will be the result if the EXFMT operation code is
performed on the record format CTLR?
A R SUBFL
A DESCRIP 101 6 1ODSPATR(UL)
A DFT(’NOT FOUND’)
A R CTLR SFLCTL(SUBFL)
A N50 SFLDSP
A SFLDSPCTL
A SFLINZ
A 67 SFIJEND
A SFLSIZ(13)
A SFLPAG(12)
A ACCOUNTNO 100 S 10
a.) Only AccountNo will display
b.) SUBFL will be initialized with 13 blank records
c.) An I/O exception error will occur
d.) The screen will display 12 records with ‘NOT FOUND’
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Answer Posted / srini
hi this srini
ans) B.
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What is the diff bw PF/LF Name and their Record format name? what is restriction in record format then file name?
1. If there are two programs using same file and 2 users are using the file at the same time and what can be done to allow them both to access? 2. How can remove lock from the file for accessing it by both users?
RETRIVING DELETED RECORDS :- I'm frequently asked how to retrieve deleted records from an unjournaled physical file when the deleted records have not yet been removed from the file. Utility UNDEL lets you undelete records in a physical file. This public domain program is available in CISC and RISC versions, and the complete source code is available for download at: UNDEL for AS/400 Save File (RISC): http://www.as400network.com/sharewarefiles/undelris.zip UNDEL for AS/400 Save File (CISC): http://www.as400network.com/sharewarefiles/undel.zip UNDEL for AS/400 Save File (Source code): http://www.as400network.com/sharewarefiles/undelsrc.zip The utility takes advantage of the fact that deleted records in physical files are only flagged as deleted, and the record data still exists until it is overwritten or the file is reorganized with a utility such as RGZPFM. UNDEL simply reads the deleted record, then reuses the record by writing over it with the new record (thus eliminating the flag for the deleted record). Some homegrown and commercial utilities copy the file containing undeleted records to a save file, then use a program to read the save file, which contains live and undeleted records, to a file to undelete the records. The UNDEL utility is superior to the SAVF technique because there's no need to copy the file to a save file, which is especially important for really large files. When run, UNDEL displays the physical file records in their unformatted, raw text form. You can either position the display to a given relative record number or use F19 or F20 to find the previous and next deleted record, respectively. The utility also includes online help, which is almost unheard of for free utilities. Other utilities include the ability to undelete records. You can use the RTVDLTRCD command in the old QUSRTOOL (no longer supported by IBM). QUSRTOOL is now a commercial product called TAA Productivity Tools ( http://www.taatool.com ). The free file editor WRKDBF has a built-in undelete capability ( http://www.wrkdbf.com ), and several commercial file editors can undelete records. For a complete list of file editors, go to http://www.sourcebook400.com, select "Programmer Tools" under "Product Category," then select "File Editors."
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