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Training
Training

... Backup is a copy of the state at a specific time Checkpoint is an incremental backup of changes since a full backup Database can be restarted after failure – At backup state – At checkpoint ...
Lecture 28
Lecture 28

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Database Management issues from Hoffer - Moodle
Database Management issues from Hoffer - Moodle

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4. Transaction processing concepts
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Lecture Note 9
Lecture Note 9

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PCS204 ADVANCED INFORMATION MANAGEMENT SYSTEMS Course Objective: L
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Chapter 15 Transaction Management
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Database System Concepts, --Silberschatz Korth, Sudarshan, -
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... A Database Management System (DBMS) is a plant of computer programs that assures the beginning, maintenance, and the use of a database. It grants organizations to place control of database growth in the hands of database administrators (DBAs) and other specialists. Databases have been in use since t ...
Concurrency Control
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Slides 01 - University of California, Irvine
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CMP 206: Principles of Database Management System

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presentation source

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DBMS functions

...  transaction or system error  local error or execution error  concurrency control enforcement  disk failure: read-write malfunction  Physical problems and catastrophes: ...
Diapositive 1
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Concurrency Control - High Point University
Concurrency Control - High Point University

... go to 2nd phase, otherwise lose changes but no harm done to DB. 2. Second Phase – data is moved from private workspace to stored database. If anything happens, the DB can recover from values in secure storage. ...
< 1 ... 146 147 148 149 150

Serializability

In concurrency control of databases, transaction processing (transaction management), and various transactional applications (e.g., transactional memory and software transactional memory), both centralized and distributed, a transaction schedule is serializable if its outcome (e.g., the resulting database state) is equal to the outcome of its transactions executed serially, i.e., sequentially without overlapping in time. Transactions are normally executed concurrently (they overlap), since this is the most efficient way. Serializability is the major correctness criterion for concurrent transactions' executions. It is considered the highest level of isolation between transactions, and plays an essential role in concurrency control. As such it is supported in all general purpose database systems. Strong strict two-phase locking (SS2PL) is a popular serializability mechanism utilized in most of the database systems (in various variants) since their early days in the 1970s.Serializability theory provides the formal framework to reason about and analyze serializability and its techniques. Though it is mathematical in nature, its fundamentals are informally (without mathematics notation) introduced below.
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