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Explain how atomicity durability is implemented in DBMS using shadow copy scheme?
The recovery-management component of a database system can support atomicity and durability by a variety of schemes. We first consider a simple, but extremely inefficient, scheme called the shadow copy scheme. This scheme, which is based on making copies of the database, called shadow copies, assumes that only one transaction is active at a time. The scheme also assumes that the database is simply a file on disk. A pointer called db-pointer is maintained on disk; it points to the current copy of the database. In the shadow-copy scheme, a transaction that wants to update the database first creates a complete copy of the database. All updates are done on the new database copy, leaving the original copy, the shadow copy, untouched. If at any point the transaction has to be aborted, the system merely deletes the new copy. The old copy of the database has not been affected. If the transaction completes, it is committed as follows. First, the operating system is asked to make sure that all pages of the new copy of the database have been written out to disk. (Unix systems use the flush command for this purpose.) After the operating system has written all the pages to disk, the database system updates the pointer db-pointer to point to the new copy of the database; the new copy then becomes the current copy of the database. The old copy of the database is then deleted.
How can you insert a new node in a linked list before any given node within the linked list in O of 1?
you dont. you insert a node after it and copy all contents of the previous node in it and put the new values in the old node. just make sure to keep the connections intact.
How do you draw pascals triangle in gwbasic?
I suggest using an array with as many elements as the longest row you need. To keep it simple, keep two copies of the array, and calculate each element of the "new" array as the sum of the corresponding element, plus the previous element, of the "old" array. Then copy the information back for the next step.
How do you rename a spreadsheet?
One way is to use the "save as" feature by clicking on file and entering a new name. Note this will make a copy with a new name. The old version will still be around. Alternatively right click on start and then click on search. Enter current name to locate the file. When it appears in the list right click on the file name and then click on rename. Do not change the extension (eg the .xls) or your software will not find or read it again.
How old is the oldest truss bridge in the world?
4000 years old.
What is needed for a 17yr old to visit the dominican republic without an adult?
You need an certificated legally permision signed by both of his fathers.
How old is the youngest aircraft mechanic?
Historically who knows. Currently you must me at least 18 yrs old to become a certificated aircraft mechanic. Reference FAR 65.71.
Need a copy of the play called old ship of zion?
Where can i find a copy of the old ship of zion
How do you copy a websites terms and conditions?
do the old copy paste trick...
Where to get a copy of play script of the old ship of Zion?
I like to get a copy of the play
What barrier surrounds Jerusalem's Old City?
The Ottoman City Walls surround the Old City of Jerusalem.
The library kept a copy of the old newspaper on?
the shelf
What if a book is so old theres no copy right showing in the book?
Then it's old.
Invent something for a John Deere tracker?
A old tracker that is very old. you can make it but you can not copy it.
Does anyone have a copy of the old ship of Zion?
Yes. A more useful question would be "Who has a copy of...", possibly followed by "...and what would they sell it for?".
Where can i pick up a two week old copy of the Sunday times?
email them directly to ask for one, and they will be happy to mail you a copy.
How can you get a copy of a operators manual for monitronics?
To get a copy of the operators manual for Monitronics, you can contact the company. The company's website may also have a copy of your manual, depending on how old or new the model is. There are many manual websites online that also can have a copy.
