What is the worstcase cost for an equality search

Assignment Help Basic Computer Science

Reference no: EM131210904

Answer the following questions about Linear Hashing.

1. How does Linear Hashing provide an average-case search cost of only slightly more than one disk I/O, given that overflow buckets are part of its data structure?

2. Does Linear Hashing guarantee at most one disk access to retrieve a record with a given key value?

3. If a Linear Hashing index using Alternative (1) for data entries contains N records, with P records per page and an average storage utilization of 80 percent, what is the worstcase cost for an equality search? Under what conditions would this cost be the actual search cost?

4. If the hash function distributes data entries over the space of bucket numbers in a very skewed (non-uniform) way, what can you say about the space utilization in data pages?

Reference no: EM131210904

Questions Cloud

Define the term most selective access path for a query : Suppose that you are building a DBMS and want to add a new aggregate operator called SECOND LARGEST, which is a variation of the MAX operator. Describe how you would implement it.

Sampling distribution of the sample : Suppose the population proportion is 0.60. If the sample size is equal to 20, what is the sampling distribution of the sample proportion, 'p-hat'?

Compute the mean and standard deviation : Compute the mean and standard deviation of the hourly wages.

What happens to the volume of trade : Show that country can gain from trade even if country does not change its production point.- What happens to the volume of trade as the country's position shifts from that shown in part a to that shown in part b ?

What is the worstcase cost for an equality search : If the hash function distributes data entries over the space of bucket numbers in a very skewed (non-uniform) way, what can you say about the space utilization in data pages?

Is a merge triggered by this deletion : Suppose you are told that there have been no deletions from this index so far. What can you say about the last entry whose insertion into the index caused a split?

Monthly mortgage payments of at least : The mean monthly mortgage paid by all home owners in a city is $1260 with a standard deviation of $140. Using Chebyshev's theorem, find the interval [L, U], that contains monthly mortgage payments of at least 90% of all home owners.

Show the index after inserting an entry with hash value 4 : Find a list of entries whose insertion into the original index would lead to a bucket with two overflow pages. Use as few entries as possible to accomplish this. What is the maximum number of entries that can be inserted into this bucket before a ..

Calculate the sample-population standard deviation : 1. Find the standard deviation for this set of data to the nearest hundredth. 2. Did you calculate the sample or population standard deviation? 3. How many hotels have ratings that fall within one standard deviation of the mean?

User Account

All Pages