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What is Oracle Process? Explain any four processes started by Oracle.
Oracle Process is as follows: SMON: The System Monitor carries out a crash recovery while a crashed instance is begin up again. It also cleans temporary segments. PMON: The Process Monitor checks if a user procedure fails and if so, does all cleaning up of resources in which the user process has acquired. DBWR : The Database Writer writes dirty blocks from the database buffer to the data files. How several DBWn Processes are begins is determined through the initialization parameter DB_WRITER_PROCESSES. DBWR also writes the actual SCN with the Block. LGWR : The Log Writer writes the redo log buffer from the SGA to the online redo log file.
Explain the structure of well formed formulae in relational calculus. Ans: a. An atom is a formula b. If P1 is a formula, after that so are ¬P1 and (P1) c. If P1 and P2 a
These permit the user to unload a database or parts of a database and reload the data on the similar machine, or on another machine in a dissimilar location. This can be useful in
The JOIN operation is applied on two relations. When we want to choose related tuples from two given relation join is used. The join operation need that both the joined relations m
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note on hashing technique
random file orgnization
DDL Compiler The DDL compiler changes the data definition statements (such as CREATE TABLE .... in SQL) into a set of tables having metadata tables. These tables have infor
Explain Growing Phase of locking Growing Phase: In this phase the transaction can only obtain locks, but cannot release any lock. The transaction enters the growing phase as so
Your OS has a set of queues, each of which is protected by a lock. To enqueue or dequeue an item, a thread must hold the lock associated to the queue. You need to implement an a
Problem: (a) Data mining is one of the best ways to analyse data and using software techniques, hidden and unexpected patterns and relationships in sets of data can be extrac
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