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PSY101 HIGHLIGHTED HANDOUTS
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INTRODUCTION TO PSYCHOLOGY:

It is the communication between the transaction manager at the location where the transaction is taking place
Initiates
 (called coordinator TM), lock operator in a central location, and Data Processing (DP) at other participating locations.

PSY101 HIGHLIGHTED HANDOUTS

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The central site can become a bottleneck With many inputs, Primary Copy 2-PL is a solution. Prototype 2-PL
It is a simple extension of 2PL focused on trying to deal with the latter Potential performance problems implement lock managers on a number of sites and.

PSY101-INTRODUCTION TO PSYCHOLOGY

PSY101 HIGHLIGHTED HANDOUTS
PSY101 HIGHLIGHTED HANDOUTS


Makes
 each lock manager responsible for managing locks for a specific set of lock units. The TM then sends its lock and unlock requests to the lock managers This particular lock is attributed to the unit.

Distributed 2-PL:
The Distributed
 2PL (D2PL) expects lock managers to be available at each site. If The database is not replicated, the 2PL distribution becomes the original 2PL versioning algorithm.  If the data is duplicated, the transaction implements the ROWA copy control protocol.

PSY101 HIGHLIGHTED HANDOUTS-INTRODUCTION TO PSYCHOLOGY


Communication
 between partner sites that completes the transaction The distributed 2PL protocol is shown in Figure 4.  Distributed 2PL communication structure Timestamp-based concurrency control
Unlike lock-based algorithms, timestamp-based concurrency control algorithms are not.


Do not try
 to maintain serialization by mutual exclusion. They choose a serialization Order and execute the transaction accordingly and establish the order, transaction The manager assigns a unique time stamp ts (Ti) when each transaction Ti is started.

PSY101 HIGHLIGHTED HANDOUTS PDF-INTRODUCTION TO PSYCHOLOGY


Timestamps are
 simple identifiers that help identify each transaction uniquely. License to order Timestamp properties Uniqueness Monotonous There are several ways to assign a time stamp. One way is to use global
(Whole system) A counter that increases monotonously.


It’s easy
 to order the execution of transaction operations according to their Timestamp. Timestamp order (TO) rules can be defined as follows Timestamp Order Rule (TO) Due to two conflicting processes of oil, Ti Okl, and Tk, the oil first ts (Ti).


Ts (Tk).
 In this case, Ti is said to be the oldest transaction and Tk is said to be the smallest. 1. The scheduler that applies the TO rule checks for conflicts in each new process. Operations that are already scheduled. If the new process is young, The operation is accepted. Otherwise, it will be rejected.

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