o write_item(X): Writes the value of program variable X into the database item named X. To simplify our notation, we assume that the program variable is also named X. The basic database access operations that a transaction can include are as follows: o read_item(X): Reads a database item named X into a program variable. Module 6 Transaction Processing Concepts A transaction is a logical unit of database processing that includes one or more database access operations-these can include insertion, deletion, modification, or retrieval operations. Environmental Pollution and Control (P.
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