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What is database Trigger?
A database trigger is a PL/SQL block that can explained to automatically execute for insert, update, and delete statements against a table. The trigger can e defined to execute once for the entire statement or once for each row that is inserted, updated, or deleted. For any one table, there are twelve events for which you can explain database triggers. A database trigger can call database procedures that are also written in PL/SQL.
An ideal data dictionary should have everything a DBA wants to know about the database. 1 Conceptual, External, and internal database descriptions. 2. Descriptions of attr
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What are the two main goals of parallelism? Load -balance multiple small accesses, so that the throughput of such accesses enhances. Parallelize large accesses so that the res
Which is the properties of entities? Attributes is the properties of entities.
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Explain the Check Clause The CHECK clause is employed to at the end of a CREATE TABLE statement specify table constraints. This is known as table-based constraint because it ap
Explain the Recoverable Schedule A recoverable schedule is one in which for each pair of transactions Ti and Tj such that Tj reads a data item formerly written by Ti, the comm
what is the importance of back up files
What is deadlock? How can it be avoided? How can it be resolved once it occurs? Deadlock happens when two transactions are each waiting on a resource that the other transaction
During the deletion of a tuple two cases can happen: Deletion of tuple in relation having the foreign key: In this type of case simply delete the desired tuple. For example, in
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