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Database System Concepts7th EditionAbraham Silberschatz Professor, Henry F. Korth, S. Sudarshan Publisher: McGraw-Hill EducationISBN: 9780078022159
Database System Concepts
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addDisadvantages of database system: The following are the disadvantages of database systems, they are:...Primary key of a relation: A primary key is a special column of a relation used for uniquely...Query: Select title from where dept_name= ‘Comp.Sci’ and credits=3 Explanation: In the above query,...Wrong with the query: The given query is considered to be syntactically correct but it does not...Description of the program code: Java code which uses Java Database Connectivity (JDBC) Application...ER diagram for the Car Insurance Company: Explanation: In the above ER diagram, “Customer”, “Car”,...Lossless decomposition: A decomposition {R1,R2} is known to be lossless join decomposition when the...Main reasons: The Common Gateway Interface (CGI) usually starts a new process for serving each and...Choice between the two: The choice for storing files each of size 2 kilobytes would be key value...
Query create view student_grades (ID,GPA) as select ID, credit_points / decode (credit_sum, 0, NULL,...a) Choice between the alternatives: In the first when considering SSD as the storage layer is better...a. Result of the action: If record 6 is moved to the place of record 5, an empty space is created at...Indices and its purpose: Indices provide link to data with a specific value. Indices also used to...Creation of runs on each pass of the sort-merge algorithm: The user will refer to the tuples...Recovery manager for database: The recovery manager is a utility released by Oracle. The recovery...Proof: Consider the set of attributes be α . F is considered to be the set of functional...Processing log records for transactions on the undo-list in reverse order: Each transaction must...Justification: No,a multiuser system is not necessarily considered to be a parallel system. Reason:...Benefits property: If the query range contains only few tuples, then each query is executed quickly...Inter-Query Parallelism: When different transactions or queries get executed in parallel then it is...Log-Structured Merge-Tree (LSM Tree): The Log-Structured Merge is an important technique used in...Blockchain fork: It generally occurs when a block is being added to the block other than the most...
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