barcode add-in for word and excel 2007 Silberschatz Korth Sudarshan: Database System Concepts, Fourth Edition in Software

Create Code 128 Code Set A in Software Silberschatz Korth Sudarshan: Database System Concepts, Fourth Edition

Silberschatz Korth Sudarshan: Database System Concepts, Fourth Edition
Code 128C Drawer In None
Using Barcode creator for Software Control to generate, create ANSI/AIM Code 128 image in Software applications.
Code 128 Code Set C Decoder In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
V Transaction Management
Create ANSI/AIM Code 128 In C#.NET
Using Barcode creation for .NET Control to generate, create Code 128B image in .NET framework applications.
Code 128 Code Set B Drawer In Visual Studio .NET
Using Barcode encoder for ASP.NET Control to generate, create Code 128 Code Set A image in ASP.NET applications.
16 Concurrency Control
Code 128B Maker In VS .NET
Using Barcode maker for .NET framework Control to generate, create USS Code 128 image in VS .NET applications.
Make Code128 In Visual Basic .NET
Using Barcode generator for VS .NET Control to generate, create USS Code 128 image in .NET framework applications.
The McGraw Hill Companies, 2001
UPC-A Supplement 5 Generation In None
Using Barcode creator for Software Control to generate, create UPC Code image in Software applications.
Code39 Generation In None
Using Barcode generator for Software Control to generate, create Code39 image in Software applications.
Summary
ECC200 Generator In None
Using Barcode printer for Software Control to generate, create ECC200 image in Software applications.
Print Barcode In None
Using Barcode maker for Software Control to generate, create barcode image in Software applications.
Special concurrency-control techniques can be developed for special data structures Often, special techniques are applied in B+ -trees to allow greater concurrency These techniques allow nonserializable access to the B+ -tree, but they ensure that the B+ -tree structure is correct, and ensure that accesses to the database itself are serializable
Painting USS Code 128 In None
Using Barcode creation for Software Control to generate, create Code 128 Code Set C image in Software applications.
EAN / UCC - 14 Printer In None
Using Barcode maker for Software Control to generate, create EAN128 image in Software applications.
Review Terms
Draw British Royal Mail 4-State Customer Code In None
Using Barcode generator for Software Control to generate, create RoyalMail4SCC image in Software applications.
Paint USS Code 39 In Java
Using Barcode generator for BIRT reports Control to generate, create Code 39 image in BIRT reports applications.
Concurrency control Lock types Shared-mode (S) lock Exclusive-mode (X) lock Lock Compatibility Request Wait Grant Deadlock Starvation Locking protocol Legal schedule Two-phase locking protocol Growing phase Shrinking phase Lock point Strict two-phase locking Rigorous two-phase locking Lock conversion Upgrade Downgrade Graph-based protocols Tree protocol Commit dependency Timestamp-based protocols Timestamp System clock Logical counter W-timestamp(Q) R-timestamp(Q) Timestamp-ordering protocol Thomas write rule Validation-based protocols Read phase Validation phase Write phase Validation test Multiple granularity Explicit locks Implicit locks Intention locks Intention lock modes Intention-shared (IS) Intention-exclusive (IX) Shared and intentionexclusive (SIX) Multiple-granularity locking protocol Multiversion concurrency control Versions Multiversion timestamp ordering Multiversion two-phase locking Read-only transactions Update transactions Deadlock handling Prevention Detection Recovery Deadlock prevention Ordered locking Preemption of locks Wait die scheme Wound wait scheme Timeout-based schemes
UPC Symbol Maker In Java
Using Barcode drawer for Java Control to generate, create Universal Product Code version A image in Java applications.
Barcode Printer In .NET Framework
Using Barcode maker for ASP.NET Control to generate, create barcode image in ASP.NET applications.
Silberschatz Korth Sudarshan: Database System Concepts, Fourth Edition
Printing GS1 128 In VS .NET
Using Barcode creation for ASP.NET Control to generate, create EAN / UCC - 14 image in ASP.NET applications.
Barcode Generation In None
Using Barcode generator for Font Control to generate, create barcode image in Font applications.
V Transaction Management
GS1 128 Encoder In Visual Basic .NET
Using Barcode drawer for VS .NET Control to generate, create UCC - 12 image in .NET applications.
Printing UPC Symbol In None
Using Barcode drawer for Font Control to generate, create GS1 - 12 image in Font applications.
16 Concurrency Control
The McGraw Hill Companies, 2001
16
Concurrency Control
Deadlock detection Wait-for graph Deadlock recovery Total rollback Partial rollback Insert and delete operations Phantom phenomenon Index-locking protocol Weak levels of consistency
Degree-two consistency Cursor stability Repeatable read Read committed Read uncommitted Concurrency in indices Crabbing B-link trees B-link-tree locking protocol Next-key locking
Exercises
161 Show that the two-phase locking protocol ensures con ict serializability, and that transactions can be serialized according to their lock points 162 Consider the following two transactions: T31 : read(A); read(B); if A = 0 then B := B + 1; write(B) T32 : read(B); read(A); if B = 0 then A := A + 1; write(A) Add lock and unlock instructions to transactions T31 and T32 , so that they observe the two-phase locking protocol Can the execution of these transactions result in a deadlock 163 What bene t does strict two-phase locking provide What disadvantages result 164 What bene t does rigorous two-phase locking provide How does it compare with other forms of two-phase locking 165 Most implementations of database systems use strict two-phase locking Suggest three reasons for the popularity of this protocol 166 Consider a database organized in the form of a rooted tree Suppose that we insert a dummy vertex between each pair of vertices Show that, if we follow the tree protocol on the new tree, we get better concurrency than if we follow the tree protocol on the original tree
Silberschatz Korth Sudarshan: Database System Concepts, Fourth Edition
V Transaction Management
16 Concurrency Control
The McGraw Hill Companies, 2001
Exercises
167 Show by example that there are schedules possible under the tree protocol that are not possible under the two-phase locking protocol, and vice versa 168 Consider the following extension to the tree-locking protocol, which allows both shared and exclusive locks: A transaction can be either a read-only transaction, in which case it can request only shared locks, or an update transaction, in which case it can request only exclusive locks Each transaction must follow the rules of the tree protocol Read-only transactions may lock any data item rst, whereas update transactions must lock the root rst Show that the protocol ensures serializability and deadlock freedom 169 Consider the following graph-based locking protocol, which allows only exclusive lock modes, and which operates on data graphs that are in the form of a rooted directed acyclic graph A transaction can lock any vertex rst To lock any other vertex, the transaction must be holding a lock on the majority of the parents of that vertex Show that the protocol ensures serializability and deadlock freedom 1610 Consider the following graph-based locking protocol that allows only exclusive lock modes, and that operates on data graphs that are in the form of a rooted directed acyclic graph A transaction can lock any vertex rst To lock any other vertex, the transaction must have visited all the parents of that vertex, and must be holding a lock on one of the parents of the vertex Show that the protocol ensures serializability and deadlock freedom 1611 Consider a variant of the tree protocol called the forest protocol The database is organized as a forest of rooted trees Each transaction Ti must follow the following rules: The rst lock in each tree may be on any data item The second, and all subsequent, locks in a tree may be requested only if the parent of the requested node is currently locked Data items may be unlocked at any time A data item may not be relocked by Ti after it has been unlocked by Ti Show that the forest protocol does not ensure serializability 1612 Locking is not done explicitly in persistent programming languages Rather, objects (or the corresponding pages) must be locked when the objects are accessed Most modern operating systems allow the user to set access protections (no access, read, write) on pages, and memory access that violate the access protections result in a protection violation (see the Unix mprotect command, for example) Describe how the access-protection mechanism can be
Copyright © OnBarcode.com . All rights reserved.