IBooks stays in loop

Question

I had to restore my iPad and on downloading all of my iBooks several of them will not  re-download they just stay in the loop and I cannot delete them or download I have no idea want is wrong need help. A.S.A.P please.
God bless
Joe DeFelice

Answer 1

If the question is already answered then you forgot to give points!
There is general assumption that you have either
loop at itab1.   ( n records)
  loop at itab2.   ( a records, a constant)
or
loop at itab1
  loop at itab2   where  key =   (m records in itab2, where m grows if n grows)
In the first case you have no performance problem, it scales with n.
In the second case, you have a performance problem if itab2 is standard table. But you can avoid it, if you use sorted tables.
You can also avoid it for standard tables by a workaround
read binary search, loop from index, exit
For details on the workaround see
Measurements on internal tables: Reads and Loops:
/people/siegfried.boes/blog/2007/09/12/runtimes-of-reads-and-loops-on-internal-tables
For background information on nonlinearity see
/people/siegfried.boes/blog/2007/02/12/performance-problems-caused-by-nonlinear-coding
Siegfried