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Consider the following partial Schedule S involving two transactions T1 and T2. Only the read and the write operations have been shown. The read operation on data item P is denoted by read(P) and the write operation on data item P is denoted by write(P) Time Instance Transaction-id T1 T2 1 read(A)   2 write(A)   3   read(C) 4   write(C) 5   read(B) 6   write(B) 7   read(A) 8   Commit 9 read(B)     Schedule S   Suppose that the transaction T1 fails immediately after time instance 9. Which one of the following statements is correct?
Consider the following statements : (a) UNIX provides three types of permissions * Read * Write * Execute (b) UNIX provides three sets of permissions * permission for owner * permission for group * permission for others Which of the above statement/s is/are true ?
Which of the following commands is used to absolutely assign all permissions to the owner, read and write permissions to the group and only executable permission to the others of the file note?
If a file has read and write permissions for the owner, then the octal representation of the permissions will be
A file owner does not have a permission to edit the file but the group to which the file owner belong do have the permission to edit it. Can owner edit the file?
Which of these commands will set the permissions on file textfile to read and write for the owner, read for the group, and nothing for everyone else?
Consider the following schedule for transactions T1, T2 and T3: T1                  T2                    T3 Read(X)                              Read(Y)                                                Read(Y)                       Write(Y) Write(X)                                                 Write(X)                       Read(X)                       Write(X) Which one of the schedules below is the correct serialization of the above?
In a group of friends travelling in a train, 8 friends can read French book, 18 can read Spanish book and 9 can read Russian book. In that group, none can read any other language book. If 2 friends in the group can read two languages book and one friend can read all the three languages book, then how many friends are there in the group ?
Read the Assertion (A) and Reason (R) and give the correct answer with the help of given below:
Assertion (A): The most important power of an owner is the right to exclude others.
Reason (R): The owner may grant to another many of his rights and yet remain owner.
The first set of the three permissions (rw) pertains to the owner of the file, indicating that the owner has