(2) Consider the following fragment of a positional index with the format: word: document: ; document: < position, ...>.. Gates: 1: <3>; 2: <6>; 3: <2,17>; 4: <1>; IBM: 4: <3>; 7: <14>; Microsoft: 1: <1>; 2: <1,21>; 3: <3>; 5: <16,22,51>; The /k operator, word1 /k word2 finds occurrences of word1 within k words of word2 (on either side), where k is a positive integer argument. Thus k = 1 demands that word1 be adjacent to word2. Describe the set of documents that satisfy the query Gates /2 Microsoft. O {1, 2} ○ {1,3} ○ {2, 3} ○ {4, 5}
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- To illustrate, imagine you have a database containing the x, y locations and names of several eateries. We shall pretend that just the following kinds of inquiries are made: Whether or if a restaurant can be located at a certain address is the focus of the inquiry. Which indexing system is preferable: B-tree or R-tree? Why?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 respectively8. Matrix algebra is a theoretical way of manipulating a database. 9. The union of tables A and B is a table containing all rows that are in either table A or table B or in both table A and table B. 10. The intersection of two tables A and B is the set of all rows that are in table A but that are not in table B.
- 1. PART (40%): Evaluation and optimization:A schema of the ski shop information system is given:Customer (cid, name, surname, address, telephone);Employee (eid, name, surname, address, telephone);Purchase (pid, sid, cid, eid, date);Skiis (sid, brand, model, length, hardness)Additional information is given:|Customer| =150 pages, 40 records/page|Employee| = 2 pages, 40 records/page|Purchase| = 2000 pages, 100 records/page|Skiis| = 250 pages, 30 records/pageBuffer can store up to 2500 pages.Let's assume that the following indices are now set on the schema from the previoustask:- Level 2 B+ index on the attribute Purchase.date- Hash index on the attribute Skiis.sidOur DBMS has the following algorithms to perform the join:- Hash join- Index nested loops join- Sort-merge joinTranslate the following SQL query into relational algebra and find the plan that readsthe fewest pages or blocks:SELECT Skiis.model, Skiis.lengthFROM Skiis JOIN Purchase ON (Skiis.sid = Purchase.sid)WHERE Skiis.brand =…Suppose we have a relational database with five tables.table key AttributesS(sid, A) SidT(tid, B) TidU(uid, C) UidR(sid, tid, D) sid, tidQ(tid, uid, E) tid, uidHere R implements a many-to-many relationship between the entities implemented with tables S and T, and Q implements a many-to-many relationship between the entities implemented with tables T and U.D. Suppose you replaced SELECT with SELECT DISTINCT in your queries from parts (a) and Could one of these modified queries return more records than the other? If so, which one? Justify your answer. E. Consider again your query from part (a). If pair sid, uid is returned by this query then there must exist at least one “path” that goes from from table S to table T (via relation R) and then from table T to table U (via relation Q). Note that there can be many such paths for a given pair sid, uid. Write an SQL query that returns records of the form tid, total where…How is a "composite data type" different from a "atomic data type," and what are its advantages?
- Give an example of a single CR that would be better represented as multiple separate CRs (specifically list out both the single CR and multiple CR representation) -OR- Give an example of a set of CRs that would be better represented as a single comprehensive CR (specifically list out both the single CR and multiple CR representation) Provide some justification for why you think one representation is more useful than the other.What is the advantage of a rich set of dimensions?What is the role of object graph serialization and how can it be useful in complex data structures and relationships between objects?
- What are the potential pitfalls of having excessively normalized data structures?Consider an information retrieval system that uses TF*IDF weights and a vector space model. To calculate the similarity between the query and each item, a straightforward system would have to loop over all documents in the collection. Explain briefly how an inverted index may be utilised to improve the efficiency of the IR system.Suppose we have a relational database with five tables. table key Attributes S(sid, A) Sid T(tid, B) Tid U(uid, C) Uid R(sid, tid, D) sid, tid Q(tid, uid, E) tid, uid Here R implements a many-to-many relationship between the entities implemented with tables S and T, and Q implements a many-to-many relationship between the entities implemented with tables T and U. A. Write an SQL query that returns all records of the form sid, uid where sid is the key of an S- record and uid is the key of a U-record and these two records are related through the relations R and Q. Use SELECT and not SELECT DISTINCT in your query. B. Write an SQL query that returns records of the form A, C where the A-value is from an S- record and the C-value is from a U-record and these two records are related through the relations R and Q. Use SELECT and not SELECT DISTINCT in your query. C. Could one of your queries from parts (a) and (b) return more records than the other? If so, which one? Justify your answer. D.…