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In the context of database systems, serializability is a critical property of transaction scheduling that ensures the correctness of concurrent transactions. A schedule (or execution sequence) of transactions is considered serializable if it can be transformed into a serial schedule—where transactions are executed one after the other without overlapping—by reordering the transactions, without changing the final outcome of the transactions. The concept of serializability ensures that even if multiple transactions are executed concurrently, the database remains consistent and the result is the same as if the transactions had been executed in some sequential order. This property is essential for maintaining the integrity of the database and preventing anomalies such as lost updates, temporary inconsistencies, and uncommitted data. Here’s an MCQ based on dense indexing in database systems:
200 litres of mixture X contains acetone and glycerine in the ratio 7:9, respectively. 80 litres of the mixture is withdrawn and labelled as mixture Y a...
A 30-litre mixture consists of milk and water in the ratio of 5:7. To this mixture, 2.5 litres of milk and 4.5 litres of water are added. How much more ...
Tap P can fill a water tank in 15 minutes, Tap Q can fill it in 20 minutes, and Tap R can empty half of the tank in 15 minutes. Now, if all the taps, P,...
A vessel contains milk and water in which 20% is water. 80 litres of mixture was taken out and replaced by water and the ratio becomes 4:5. Find the ini...
The cost of 3 kg of rice is Rs. 180. The cost of 8 kg of rice is equal to that of 5 kg of pulse. The cost of 15 kg of pulses is equal to that of 2 kg of...
In an 800 ml mixture, 60% is soda, and the remainder is water. If 96 ml of soda and 128 ml of water are added to this mixture, determine the new ratio o...
A container contains (x + 80) litres of milk and x liters of alcohol. If 50 litres of milk and x litres of alcohol is added in the container, then the q...
Mixture ‘A’ consists of petrol and acid in a 4:1 ratio, while Mixture ‘B’ contains petrol and acid in a ratio of 5:3. If these two mixtures are ...
In a mixture containing a certain quantity of pure alcohol, 20% of the alcohol is removed from the container and replaced with an equal amount of water....