Interested to Buy Any Domain ? << Click Here >> for more details...
How Commitment and Roll back control is used in as400,
explain with real time senario ???
- 2 Answers
- 16027 Views
- Acolite, HSBC, I also Faced
- E-Mail Answers
Answer Posted / garry
With commit/rollback we can ensure data consistency.
Consider a scearion where commit/rollback is not used.
Suppose your program writes/updates 10 files. In case the
program fails in between (say after updating 5 files),
there will be data in 5 files and corresponding data will
not be available in 5 files.
If we introduce commit/rollback in above program. In case
of program failure changes made to 5 files can be rolled
back so that we don't have inconsistency between files.
with Commit/rollback we can ensure either all files are
updated or not file is updated.
| Is This Answer Correct ? | 7 Yes | 3 No |
Post New Answer View All Answers
If my rpg program has a date field, what extra care I have to take while compiling that rpg program? If the file is keyed and I have declared the file as well as key list properly in my program. Still am getting an error message like "chain/reade operation is not allowed" what may be the case?
Explain mdt?
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."
what is the procedure and explain about real time scenario.
Please tell me how to read the records from a file with load an array of size with error conditions(The logic answer for this question is ARR is array of 99 elements Z-ADD 0 IDX *LOVAL SETLL FILE READ FILE 99 *IN99 DOWEQ *OFF IDX ANDLT 99 ADD 1 IDX MOVE FIELD ARR,IDX READ FILE 99 ENDDO).So,Please give me the complete of this code.
how does the rpg element work?
How many program bind in one module....
how can I tell when to replace the array?
what is the necessary keyword needed to scroll subfile records?
What are the types of identifiers?
write an RPG program to calculate the marks of 5 students (A,B, C, D, E)in 3 different subjects (eng, math, sci) an display on the screen
What is ment by record level identifier?
Interviewer asked me write down DDS for load all subfile .can anybody write dds
can I touch the array during treatments?
Assume 2 users are using the same file and first user updates some record in the file. Will the 2nd user will be able to see the updated record or not?
