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Objectives
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
What Is Sql? Structured Query Language (SQL) is a standard query language. It is usually used with all relational databases for data manipulation and definition. All the re
word limit no mentioned
we need example of 2phase locking
Timestamps For Read operations: If TS (T) If TS (T) >= W-timestamp (Q), then the transaction T is trying to read a value of data item Q which has been written and committed
What are temporary tables? Temporary tables exist solely for a particular session or whose data persists for the duration of the transaction.
what are the type of the database
Determine the concept of Process Process: A process transforms the data values. It is represented as ellipse containing a description of transformation. Each procedure has a
What are audit trails? An audit trail is a log of all alters to the database along with information like which user performed the change and when the alter was performed.
why shadow copy technique is used?
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