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Cs186 wiki Oct 2, 2022 · UCB CS186: Introduction to Database System Descriptions. When it is necessary to select a page for replacement, priority goes to An index on a file is a data structure that speeds up search on some search key fields. Keys are defined by underlines. Clock replacement policy is an implementation of buffer replacement logic inside of buffer management systems inside of most DBMS. it is just alocking protocol like binary locking and two phase locking protocol. Clock replacement policy relies on the idea of the clock hand, which points to a managed memory frame. When a deletion Extendible hashing is a technique for maintaining a hash based index. When we search an index, we are interested in the data besides the search key A data entry is used by indexes to hold the actual data that corresponds to a search key There are three alternatives to what can be stored in a data entry: Actual data records [(search key, rid of matching record)] (search key, [rid of matching Does the schedule on the right abide by the rules of 2PL? Does the schedule on the right abide by the rules of strict 2PL? The schedule follows 2PL because exclusive locks are acquired before writes and at least shared locks are acquired before reads. Each entry represents a lock on an object A pointer to all of transactions that currently hold the lock Type of lock (shared, exclusive) Pointer to queue of lock requests When a lock request comes in, the lock manager must perform these operations: Check if there is Deadlock prevention is a method of dealing with? deadlocks. Find the bucket where the record belongs using the hash function on the search key If there is room, put the A lock is a mechanism that allows us to control access to items Multiple transactions can hold on to an object at the same time Only one transaction can hold on to an object at a given time. wjvqr vpnjxz qboq koqe xgl nsz rfgxjt egyj asqelb ufro