For an index on the SSN field, assume the field size VSSN=20 bytes, record pointer size PR=10, block size B=512 bytes and r=5000. Then find out the below: Index entry size RI Index blocking factor BfrI Number of index blocks b
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For an index on the SSN field, assume the field size VSSN=20 bytes, record pointer size PR=10, block size B=512 bytes and r=5000.
Then find out the below:
- Index entry size RI
- Index blocking factor BfrI
- Number of index blocks b
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Solved in 4 steps
- Consider the snapshot isolation used in the database of a large airline. What are some cases when an airline would choose to forego serialization in favor of improved performance?Explain the internal and external fragmentation. What exactly is it,Take airline database "snapshot isolation" as an example. Is it reasonable to use a technique that doesn't work well with serialization if airlines are able to improve their overall performance?
- Where does fragmentation come in? Make a distinction between internal and external fragmentation.How does it function when data is cached in an entirely associative format?Consider a file of 16384 records. Each record is 32 bytes long and its key field is of size 6 bytes. The file is ordered on a non-key field, and the file organization is unspanned. The file is stored in a file system with block size 1024 bytes, and the size of a block pointer is 10 bytes. If the secondary index is built on the key field of the file, and a multilevel index scheme is used to store the secondary index, the number of first-level and second-level blocks in the multilevel index are respectively
- Consider a file with a secondary dense index structure on a non-ordering key field where 120,000 records stored on a disk with block size of 2048 bytes. Length of every record is of fixed and un-spanned Record size is 150 bytes.What are distributed deadlock detection and resolution mechanisms, and why are they essential in DDBMS?In the variable-length record representation, a null bitmap is used to indicateif an attribute has the null value. For variable-length fields, if the value is null, what would be stored in the offset and length fields?
- The null bitmap is used in the variable-length record format to indicate that a certain attribute is empty. In certain odd situations, a tuple may have most or all of its properties set to null. The overhead of a null attribute may be reduced to a single bit by changing the method in which records are represented.Explain the difference between internal and external fragmentation with two examples. Use illustrationsDistinguish between inclusive and exclusive caches by looking at their contents.