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Concurrency control II

Concurrency control II

Concurrency control II. General Overview. Relational model - SQL Formal & commercial query languages Functional Dependencies Normalization Physical Design Indexing Query Processing and Optimization Transaction Processing and CC. Review: AC[I]D. Isolation

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379 views • 28 slides
Concurrency Control

Concurrency Control

Concurrency Control. Lock-Based Protocols Multiple Granularity Deadlock Timestamp-Based Protocols. Concurrency Control. A lock is a mechanism to control concurrent access to a data item Data items can be locked in two modes :

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366 views • 28 slides
Transactions and Exception Handling

Transactions and Exception Handling

Transactions and Exception Handling. Eric Allsop SQLBits 6 th October 2007. Transactions and Exception Handling. Transactions Lock Manager Locks, lockable resources and modes Managing locks Concurrency vs. Isolation Blocks and Deadlocks Old School Exception Handling TRY/CATCH

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358 views • 21 slides
Transactions and Exception Handling

Transactions and Exception Handling

Transactions and Exception Handling. Eric Allsop SQLBits 6 th October 2007. Transactions and Exception Handling. Transactions Lock Manager Locks, lockable resources and modes Managing locks Concurrency vs. Isolation Blocks and Deadlocks Old School Exception Handling TRY/CATCH

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213 views • 21 slides
Lecture 9- Concurrency Control (continued)

Lecture 9- Concurrency Control (continued)

Advanced Databases. Lecture 9- Concurrency Control (continued). Masood Niazi Torshiz Islamic Azad University- Mashhad Branch www.mniazi.ir. Allow data items to be of various sizes and define a hierarchy of data granularities, where the small granularities are nested within larger ones

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220 views • 21 slides
Chapter 18.5: An Architecture for a Locking Scheduler

Chapter 18.5: An Architecture for a Locking Scheduler

Chapter 18.5: An Architecture for a Locking Scheduler. Loc Nguyen Class ID: 213 Feb 27, 2008. Overview. Assume knowledge of: Lock Two phase lock Lock modes: shared, exclusive, update Consider a simple scheduler that: Insert locks for transaction Release locks when told. Lock table.

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314 views • 10 slides
Figure 15.2 Multiversion database.

Figure 15.2 Multiversion database.

Figure 15.1 Conflict table for a two-phase locking concurrency control. Conflicts between lock modes are denoted by X. Figure 15.2 Multiversion database. Figure 15.3 Conflict table for intention locks. Conflicts between lock modes are denoted X.

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116 views • 4 slides

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