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develop cost functions for an algorithm that consists of two selects a join and a final project in terms of the cost
develop formulas for the hybrid hash-join algorithm for calculating the size of the buffer for the first bucket develop
how many serial schedules exist for the three transactions in figure 218a what are they what is the total number of
what is meant by the concurrent execution of database transactions in a multiuser system discuss why concurrency
what is the system log used for what are the typical kinds of records in a system log what are transaction commit
discuss the different measures of transaction equivalence what is the difference between conflict equivalence and view
what is a serial schedule what is a serializable schedule why is a serial schedule considered correct why is a
what is the two-phase locking protocolhow does it guarantee
what are some variations of the two-phase locking protocol why is strict or rigorous two-phase locking often
how do optimistic concurrency control techniques differ from other concurrency control techniques why are they also
how does the granularity of data items affect the performance of concurrency control what factors affect selection of
describe the shadow paging recovery technique under what circumstances does it not require a
discuss the deferred update technique of recovery what are the advantages and disadvantages of this technique why is it
what is the difference between the undoredo and the undono-redo algorithms for recovery with immediate update develop
discuss the immediate update recovery technique in both single-user and multiuser environments what are the advantages
what are log sequence numbers lsns in aries how are they used what information do the dirty page table and transaction
modify the data structures for multiple-mode locks and the algorithms for readlockx writelockx and unlockx so that
what is the system log used for what are the typical kinds of entries in a system log what are checkpoints and why are
what is meant by transaction rollback what is meant by cascading rollback why do practical recovery methods use
what are the before image bfim and after image afim of a data item what is the difference between in-place updating and
discuss the different types of transaction failures what is meant by catastrophic