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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.
what do you mean by primary key constraint?
What is deadlock? Neither of the transaction can ever proceed with its normal implementation. This situation is known as deadlock.
explain multi key file organisation
Benefits of Hashed file Organisation 1. Insertion or search on hash-key is quick. 2. Best if equality search is required on hash-key. Drawbacks of Hashed file
Saving Derived Attributes to Avoid Re-computation As discussed, "redundancy means duplication of exact data". But, if multiple copies of same data are present in the system,
What are the two distinct aspects to the implementation of associations? i) It is required to define data declarations which will enable details of actual links to be stored. I
What is the difference between the function module and a normal ABAP/4 subroutine? In contrast to normal subroutines function modules have uniquely exact interface. Declaring da
Explain what is Aggregation? Aggregation: Aggregation is an significant concept in database design whereas composite objects could be modelled during the design of database a
What is a Transaction? A transaction is an event which happens on the database. Generally a transaction reads a value from the database or writes a value to the database. If y
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