Complete the code to identify the property of a schedule that ensures no transaction reads data from an uncommitted transaction.
A schedule is called [1] if it ensures no transaction reads data from an uncommitted transaction.
A cascadeless schedule prevents transactions from reading uncommitted data, avoiding cascading aborts.
Complete the code to define a schedule where transactions commit only after all transactions they depend on have committed.
A schedule is [1] if for every pair of transactions T_i and T_j, where T_j reads data written by T_i, T_i commits before T_j.
Recoverable schedules ensure that transactions commit only after the transactions they depend on have committed, preventing inconsistencies.
Fix the error in the statement about cascadeless schedules.
In a cascadeless schedule, transactions can read uncommitted data from other transactions, which may cause cascading aborts. This statement is [1].
The statement is false because cascadeless schedules prevent reading uncommitted data, thus avoiding cascading aborts.
Fill both blanks to complete the definition of strict schedules.
A schedule is strict if transactions [1] any data item until they [2].
Strict schedules prevent transactions from reading or writing data items until the transactions that last wrote them have committed or aborted, ensuring recoverability and cascadelessness.
Fill all three blanks to complete the explanation of schedule properties.
If a schedule is [1], it is also [2], but the reverse is not always true. Additionally, [3] schedules prevent cascading aborts by disallowing reads of uncommitted data.
Strict schedules are a subset of recoverable schedules. Cascadeless schedules specifically prevent cascading aborts by disallowing reads of uncommitted data.