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Hot Backup:Some sites cannot terminate the database while creating a backup copy of the files. The cold backup is not a reliable option. So different kinds of backing up database must be used - the hot backup. Gives a SQL command to refer to Oracle, on a tablespace-by-tablespace basis, that the folders of the tablespace are to back up. The users can continue to create full use of the files, including creating modifications to the data. Once the user has refers that he/she wants to back up the files, he/she can need the operating system to copy those files to the right backup destination. The database has to be operating in ARCHIVELOG mode for the hot backup option.
What is multiple relationship ?
Having clause This clause is used for producing conditions on grouped information. Example: Find maximum salary and department number of those departments where maxim
Explain the difference between using functions along with and without grouping attributes in relational algebra. Give examples. Ans: Group functions are used to group data of
Explain Composite attribute in SQL ? Composite attribute: A composite attribute has many components, each of that is atomic or composite.
Define page. The database is partitioned into some number of fixed-length blocks, which are referred to as pages.
What is a hashing function? What are the properties of a good hashing function? Describe the folding technique for hashing functions. Ans: Hashing function is a method
Explain the three data models namely relational, network and hierarchical and evaluate their relative advantages and disadvantages. Hierarchical Model: In hierarchical model, da
Assigning Responsibility for Operation Many operations might have obvious target objects, but some of these operations could be used at numerous places in an algorithm, by one
Explain Two phase locking protocol A transaction is consider as to follow the two-phase locking protocol if all locking operations precede the first unlock operation in the tra
Modular growth: In distributed environments, it is simple to expand. Latest sites can be added to the network without affecting the operations of other sites, as they are somewhat
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