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What is bucket overflow and how bucket overflow is handled through Over Flow Chaining or Closed Hashing?
Ans: Bucket: unit of storage holding records. Bucket is a disk block or contiguous block .Bucket contains multiple records.
Hash Function: maps records to bucket numbers Function h from set of all search key values K to the set of all bucket addresses (numbers) B .Records along with different search key values may be mapped similar bucket. Whole bucket has to be searched to locate record. If bucket is full required overflow buckets and pointers
How to handle bucket overflow:
• Buckets overflow is handled through using overflow buckets1. Closed Hashing (Chaining): The overflow buckets of a given bucket are chained together in a linked list2. Open Hashing: place in further available bucket (not suitable for database applications)3. Multiple Hashing : use a second hash function
Benefits of Sequential File Organisation It is quick and efficient when dealing with huge volumes of data that require being processed periodically (batch system). Dra
In tuple relational calculus P1 → P2 is equivalent to ? A In tuple relational calculus P1→ P2 is equivalent to ¬P1 V P2. (The logical implication expression A B, meaning
What is data integrity? Ans: It is the data consisted of in database that is accurate and consistent. (Data integrity means that the data should be valid as per to the give
Vertical Fragmentation- Vertical fragmentation groups together only those attributes in a relation that are used jointly by various important transactions. A vertical fragment is d
Using Column aliases Example: To print column names as NAME and ANNUAL SALARY SELECT ENAME "NAME", SAL*12 "ANNUAL SALARY" FROM EMP;
What is trigger? Triggers are statements that are executed automatically by the system as the side effect of a modification to the database.
What is Multivalued Attribute? Multivalued Attribute - Multivalued attribute might have more than one value for an entity. For instance, PreviousDegrees of a STUDENT.
You are managing the following database system: • DBMS: Oracle 11g • OS: Sun Solaris • System architecture: Web-based application using ASP.Net • Purpose of Server: HR manage
1.Suppose you are given a dataset that consists of a random sample of tasters, on which the following variables were obtained: (y) Zpref = taste preference for green beans store
You are required to program (in a high level language such as C, C++, Java) and implement a cache simulator which will have the following inputs and outputs:- INPUTS
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