Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Entry-sequenced file organization
The records in an entry-sequenced file are store up in the order they are written into the file. New records are for all time appended to the end of the file. When records are removed from an entry-sequenced file the space formerly allocated to those records is not automatically reclaimed or reused. The only means to reclaim this space is by using the sfs_ReorganizeFile function. Entry-sequenced files are often used when records in the file will be accessed in the order that they are written to the file. This type of file organization is frequently used for log files, audit trail files, or for any other files that keep time-sequenced records of events.
Entry-sequenced files are able to contain fixed-length or variable-length records. When an existing record is updated then the updated record must be no longer than the original record. Every record in an entry-sequenced file has an entry sequence number (ESN) which are corresponds to the order in which it was inserted into the file. The ESN isn't part of the record, and is therefore said to be implicit. Because the value of the primary index key for entry-sequenced files isn't part of the record, merely the name of the primary index must be specified when creating an entry-sequenced file in SFS. It isn't necessary to supply names of fields on which to base the index.
When records are read by an entry-sequenced file a sequential scan on the primary index (ESN) for the file returns records in the order in which they were inserted regardless of whether they have subsequently been updated. Records that have been deleted don't show up when an entry-sequenced file is scanned.
FCFS (First Come, First Served) Perform operations in order requested No reordering of work queue No starvation every demand is serviced Poor performance
What are scheduling queues? Since the processes enter the system they are put into job queue. This queue contains all processes in the system. The processes that are exist in m
Another solution then would be to keep a pool of threads. Whenever a new task arrives, the system would simply get a thread from pool and set that thread to work on the given task.
Characteristics of suspend process Suspended process isn't immediately available for execution. The process may or may not be waiting on an event. For preventing t
What are a safe state and an unsafe state? Answer: A state is safe if the system can allocate resources to every process in some order and still avoid a deadlock. A system is
Do ratio analysis by comparing the four companies financial statements, analysis and interpretation on the four-basic group : (Refer to attachment A) Liquidity ratio Asset
Demand paging gives that pages could only be brought into memory if the running process acts them. This is usually referred to as lazy evaluation as only those pages operated by
What is meant by arm-stickiness? If one or a few processes have a high access rate to data on single track of a storage disk, then they might be monopolizing the device by repe
Deadlock Prevention Prevention is the name given to method that guarantee that deadlocks can never happen for the reason that the way the system is structured. Since 4 conditio
LRU evicts the page which was last accessed the farthest into the past of any page resident in physical memory, i.e. the least-recently used page. LRU approximates OPT when the rec
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd