أحبتي المشرفين والاعضاء بحثت في المنتدى الكريم عن الموضوع وعن كيفية
concurrency control&serialzability&recoverability&dead lock&timestamping
ولم أجد فأريد منكم ان تفيدونا بعون الله عن هذه المواضيع النظرية المهمة في نظري في DBMS شاكرا جهودكم المبذولة في تكوين شبكة من العلم والصداقة والمعرفة فيد الله مع الجماعة
أخوكم mamit

salam walikom brother ......
the concept u asked r very important and needs alot of time to describe each one in detail....i will try to cover some now and others next time.
But before starting , u have to be familiar with these
two keywords : 1.process 2.resource
so whts process????
process is a program which is in execution mode....it is mean that the program in main memory
wht is resource??? it can defined as objects which are needed by the program inorder to execute itself .

so a process has to allocate one or more resource..but how
about if we have more than process??which one will and to
whom is the processes are allocated first ???
...therefore job shcheduling algorithm is used for that....

We can execute one process at a time .But in case we have many users connecting at the same time to the cpu then we
have to take care of other processes also,therefore concurrent process concept has been exist.





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