What is serializable & non-serializable schedule?

Serializable schedule It identifies which schedules are correct when executions of the transaction have interleaving of their operations. A non-serial schedule will be serializable if its result is equal to the result of its transactions executed serially.

Can a non-serializable schedule be recoverable?

(C) The schedule is non-serializable schedule and is not strict recoverable schedule.

Why is recoverability of schedules desirable?

Recoverable schedules are desirable because failure of a transaction might otherwise bring the system into an irreversibly inconsistent state.

What are serializable schedules?

A serializable schedule is a schedule whose effect on any consistent database instance is guaranteed to be identical to that of some complete serial schedule over S. Example 2. T1.

What is the difference between Serializable and non serial schedules?

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.

Are all conflict serializable schedules recoverable?

All conflict serializable schedules are recoverable. All recoverable schedules may or may not be conflict serializable. Check if there exists any dirty read operation. If there does not exist any dirty read operation, then the schedule is surely recoverable.

What is serial schedule in SQL Server?

Schedules in which the transactions are executed non-interleaved, i.e., a serial schedule is one in which no transaction starts until a running transaction has ended are called serial schedules. Example: Consider the following schedule involving two transactions T 1 and T 2.

What is a serializable transaction?

A serializable transaction sees the database in exactly same state it was when the transaction had begun, except for the changes made by the transaction itself. Thanks for contributing an answer to Stack Overflow!