'Exclusive locks' diaporamas de présentation

OVERVIEW

587 views • 46 slides

Concurrency Control

Concurrency Control. Amol Deshpande CMSC424. Approach, Assumptions etc. Approach Guarantee conflict-serializability by allowing certain types of concurrency Lock-based Assumptions: Durability is not a problem So no crashes Though transactions may still abort Goal: Serializability

534 views • 36 slides

Concurrency Control

Concurrency Control. Amol Deshpande CMSC424. Approach, Assumptions etc. Approach Guarantee conflict-serializability by allowing certain types of concurrency Lock-based Assumptions: Durability is not a problem So no crashes Though transactions may still abort Goal: Serializability

548 views • 36 slides

Concurrent Transactions

351 views • 34 slides

Final Exam Review

Final Exam Review. Last Lecture R&G - All Chapters Covered. The end crowns all, And that old common arbitrator, Time, Will one day end it. William Shakespeare. Troilus and Cressida. . Topics Covered. Transactions Concurrency Control Crash Recovery.

366 views • 29 slides

Concurrency

Concurrency. Correctness Principle. A transaction is atomic -- all or none property. If it executes partly, an invalid state is likely to result. A transaction, may change the DB from a consistent state to another consistent state. Otherwise it is rejected (aborted).

336 views • 28 slides

Concurrency Control

Concurrency Control. By Donavon Norwood Ankit Patel Aniket Mulye. INTRODUCTION. Enforcing serializability by locks Locks Locking scheduler Two phase locking Locking systems with several lock modes Shared and exclusive locks Compatibility matrices Upgrading/updating locks

362 views • 23 slides

Concurrency Control

Concurrency Control. By Donavon Norwood Ankit Patel Aniket Mulye. INTRODUCTION. Enforcing serializability by locks Locks Locking scheduler Two phase locking Locking systems with several lock modes Shared and exclusive locks Compatibility matrices Upgrading/updating locks

362 views • 23 slides

Windows 7 Group Policy

Windows 7 Group Policy. Clyde G. Johnson. Agenda. Test Environment Tools of the trade Demo Central Store Show Group Policy Spreadsheets Demo Planning and Deployment. Test Environment. Mine is built in VMware Workstation Windows 2003 domain controller / file server Windows XP client

331 views • 20 slides

PL/SQL Security

PL/SQL Security. Types of Locks Level of Locks Explicit Locking Using Lock table stmt Releasing locks Explicit lock using SQL & PL/SQL Deadlock Error handling in PL/SQL. Locks. Locks :-

301 views • 15 slides

Transactions

Transactions . Concurrency Control. Improved lock-based concurrency with multiple writes. Update Locks. Shared & Exclusive Locks. An Example. 11 steps. Upgrading Locks. Use Shared Locks when reading Upgrade (if possible) to Exclusive Lock when just before writing

238 views • 12 slides

Concurrency Control

Concurrency Control. ?????? ???? ???????. ?????? ????. When several transactions execute concurrently in the database, the consistency of data may no longer be preserved.

330 views • 12 slides

Gowtham Rajappan

235 views • 12 slides