كل مايخص الحاسوب والبرامج (كمبيوتر -اندرويد) برمجة وغيرها
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Record insertion is quite efficient in Ordered Files .
New records are inserted at the end of the file in Unordered Files
ordered Files called a heap or a pile file.
Spanned: a record can be stored in more than one block
no record can span two blocks
File records can not be unspanned or spanned
A file can have fixed-length records or variable-length records.
Blocking factor is the (average) number of file records stored in a disk block.
includes information that describes the file
is a sequence of records
Refers to records that exceed the size of one or more blocks and hence span a number of blocks.
bfr refers to the number of records per disk.
There may be empty space in a block if an integral number of records do not fit in one block.
Blocking factor (bfr) refers to the storing a number of records per block.
Refers to storing a number of records in one block on the disk
Variable length fields can be mixed into one record
Records contain tracks which have values of a particular type
Double buffering can be used to speed up the transfer of contiguous disk blocks.
