197k views
4 votes
For each of the 7 logic gates: Give an example of a real-life

application that utilises the gate. You can also use a diagram to
support your answer

User Vadim Key
by
7.8k points

1 Answer

3 votes

This schedule is serializable because it can be made equivalent to a serial execution of the transactions, but it is not conflict-serializable nor strictly serial due to the absence of traditional conflicts and strict execution order.

To create a schedule S of transactions that is serializable but not conflict-serializable nor serial, we need to design a scenario where transactions have a dependency that can be resolved by enforcing a particular order, making it serializable but not following the strict rules of conflict-serializability.

Let's create a scenario:

Scenario:

- We have two transactions, T1 and T2.

- Both transactions read and write to the same element X.

- The constants for these transactions are C1 and C2, respectively.

Transactions:

- T1 reads X and writes X as X = X * C1 (e.g., X = X * 5).

- T2 reads X and writes X as X = X * C2 (e.g., X = X * 7).

Schedule S:

- Execute T1, then execute T2.

Step-by-step explanation:

1. T1 reads X and multiplies it by C1, updating X. Let's say X was initially 2, so after T1, X becomes 10 (2 * 5).

2. T2 reads X (which is now 10 after T1) and multiplies it by C2, updating X again. X becomes 70 (10 * 7).

Analysis:

Now, let's analyze the properties of this schedule:

1. Serializable: The schedule is serializable because it can be made equivalent to a serial execution of T1 followed by T2. In the serial execution, X would also become 70 (2 * 5 * 7), which is the same as in schedule S.

2. Not Conflict-Serializable: Schedule S is not conflict-serializable because there is no conflict in the traditional sense (i.e., two transactions trying to access the same data simultaneously). The transactions do not conflict in terms of accessing X at the same time. However, conflict-serializability checks for conflicts based on conflicting operations (read-write, write-read, or write-write), and there is no such conflict here.

3. Not Strictly Serial: Schedule S is not strictly serial because it does not follow a strict order of execution, and the transactions are not isolated from each other. In a strict serial schedule, one transaction would complete before the other begins.

User NSGaga
by
8.6k points