It is mainly used in the Non-Serial scheduling to verify whether the scheduling will lead to any inconsistency or not. On the other hand, a serial schedule does not need the serializability because it follows a transaction only when the previous transaction is complete. The non-serial schedule is said to be in a serializable schedule only when it is equivalent to the serial schedules, for an n number of transactions. Since concurrency is allowed in this case thus, multiple transactions can execute concurrently.
A serializable schedule helps in improving both resource utilization and CPU throughput. These are of two types: Conflict Serializable: A schedule is called conflict serializable if it can be transformed into a serial schedule by swapping non-conflicting operations.
Two operations are said to be conflicting if all conditions satisfy: They belong to different transactions They operate on the same data item At Least one of them is a write operation View Serializable: A Schedule is called view serializable if it is view equal to a serial schedule no overlapping transactions.
A conflict schedule is a view serializable but if the serializability contains blind writes, then the view serializable does not conflict serializable. Non-Serializable: The non-serializable schedule is divided into two types, Recoverable and Non-recoverable Schedule.
Recoverable Schedule: Schedules in which transactions commit only after all transactions whose changes they read commit are called recoverable schedules. In other words, if some transaction T j is reading value updated or written by some other transaction T i , then the commit of T j must occur after the commit of T i. Example — Consider the following schedule involving two transactions T 1 and T 2. There can be three types of recoverable schedule:.
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Attributes and Parameters in Servlets. Init method and Constructor in Servlet. Is Invalid Statement. JSP include standard action and include directive. JSP standard actions. Preinitialization of Servlet. In the other hand the schedule is cascade-less if it's free from dirty read. Is the following schedule is recoverable ,cascade-less? Nada Ghanem Nada Ghanem 6 6 silver badges 16 16 bronze badges.
Add a comment. Active Oldest Votes. I think misspelling on T1 transaction it must be Write A? But the following scenarios are nonrecoverable. Mehmet Erdas Mehmet Erdas 11 4 4 bronze badges. Sign up or log in Sign up using Google.
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