free barcode font for excel 2007 Other Features in Software

Encode Code128 in Software Other Features

17963 Other Features
Generate Code 128 Code Set A In None
Using Barcode creation for Software Control to generate, create Code 128 Code Set A image in Software applications.
Decoding Code 128 Code Set C In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
Among other key features that ARIES provides are: Recovery independence: Some pages can be recovered independently from others, so that they can be used even while other pages are being recovered If some pages of a disk fail, they can be recovered without stopping transaction processing on other pages Savepoints: Transactions can record savepoints, and can be rolled back partially, up to a savepoint This can be quite useful for deadlock handling, since transactions can be rolled back up to a point that permits release of required locks, and then restarted from that point Fine-grained locking: The ARIES recovery algorithm can be used with index concurrency control algorithms that permit tuple level locking on indices, instead of page level locking, which improves concurrency signi cantly
Making ANSI/AIM Code 128 In Visual C#.NET
Using Barcode printer for Visual Studio .NET Control to generate, create Code 128 Code Set C image in .NET applications.
Code128 Encoder In .NET Framework
Using Barcode encoder for ASP.NET Control to generate, create ANSI/AIM Code 128 image in ASP.NET applications.
Silberschatz Korth Sudarshan: Database System Concepts, Fourth Edition
Code 128 Code Set C Drawer In Visual Studio .NET
Using Barcode generation for .NET framework Control to generate, create Code 128 Code Set C image in VS .NET applications.
Paint Code 128 In VB.NET
Using Barcode encoder for .NET framework Control to generate, create Code 128A image in .NET framework applications.
V Transaction Management
Creating UPC-A Supplement 2 In None
Using Barcode maker for Software Control to generate, create UCC - 12 image in Software applications.
EAN 128 Generation In None
Using Barcode maker for Software Control to generate, create UCC.EAN - 128 image in Software applications.
17 Recovery System
Code39 Maker In None
Using Barcode printer for Software Control to generate, create Code 39 Full ASCII image in Software applications.
Encode Code 128A In None
Using Barcode generator for Software Control to generate, create Code 128 Code Set B image in Software applications.
The McGraw Hill Companies, 2001
EAN 13 Encoder In None
Using Barcode printer for Software Control to generate, create EAN-13 Supplement 5 image in Software applications.
ECC200 Creator In None
Using Barcode creator for Software Control to generate, create ECC200 image in Software applications.
17
Generating 2 Of 5 Industrial In None
Using Barcode generation for Software Control to generate, create Standard 2 of 5 image in Software applications.
UPC A Drawer In Java
Using Barcode generation for Java Control to generate, create GS1 - 12 image in Java applications.
Recovery System
Barcode Creation In VS .NET
Using Barcode creator for .NET Control to generate, create bar code image in VS .NET applications.
Draw 2D Barcode In C#.NET
Using Barcode creation for VS .NET Control to generate, create Matrix 2D Barcode image in .NET applications.
Recovery optimizations: The DirtyPageTable can be used to prefetch pages during redo, instead of fetching a page only when the system nds a log record to be applied to the page Out-of-order redo is also possible: Redo can be postponed on a page being fetched from disk, and performed when the page is fetched Meanwhile, other log records can continue to be processed In summary, the ARIES algorithm is a state-of-the-art recovery algorithm, incorporating a variety of optimizations designed to improve concurrency, reduce logging overhead, and reduce recovery time
Read UPC-A Supplement 5 In .NET
Using Barcode reader for .NET framework Control to read, scan read, scan image in VS .NET applications.
ANSI/AIM Code 39 Encoder In .NET Framework
Using Barcode generation for .NET framework Control to generate, create Code 39 image in .NET applications.
1710 Remote Backup Systems
Code-128 Encoder In Objective-C
Using Barcode creation for iPhone Control to generate, create Code128 image in iPhone applications.
GTIN - 13 Scanner In C#.NET
Using Barcode scanner for .NET framework Control to read, scan read, scan image in VS .NET applications.
Traditional transaction-processing systems are centralized or client server systems Such systems are vulnerable to environmental disasters such as re, ooding, or earthquakes Increasingly, there is a need for transaction-processing systems that can function in spite of system failures or environmental disasters Such systems must provide high availability, that is, the time for which the system is unusable must be extremely small We can achieve high availability by performing transaction processing at one site, called the primary site, and having a remote backup site where all the data from the primary site are replicated The remote backup site is sometimes also called the secondary site The remote site must be kept synchronized with the primary site, as updates are performed at the primary We achieve synchronization by sending all log records from primary site to the remote backup site The remote backup site must be physically separated from the primary for example, we can locate it in a different state so that a disaster at the primary does not damage the remote backup site Figure 1710 shows the architecture of a remote backup system When the primary site fails, the remote backup site takes over processing First, however, it performs recovery, using its (perhaps outdated) copy of the data from the primary, and the log records received from the primary In effect, the remote backup site is performing recovery actions that would have been performed at the primary site when the latter recovered Standard recovery algorithms, with minor modi cations, can be used for recovery at the remote backup site Once recovery has been performed, the remote backup site starts processing transactions
primary
network
backup
log records
Figure 1710 Architecture of remote backup system
Silberschatz Korth Sudarshan: Database System Concepts, Fourth Edition
V Transaction Management
17 Recovery System
The McGraw Hill Companies, 2001
Remote Backup Systems
Availability is greatly increased over a single-site system, since the system can recover even if all data at the primary site are lost The performance of a remote backup system is better than the performance of a distributed system with two-phase commit Several issues must be addressed in designing a remote backup system: Detection of failure As in failure-handling protocols for distributed system, it is important for the remote backup system to detect when the primary has failed Failure of communication lines can fool the remote backup into believing that the primary has failed To avoid this problem, we maintain several communication links with independent modes of failure between the primary and the remote backup For example, in addition to the network connection, there may be a separate modem connection over a telephone line, with services provided by different telecommunication companies These connections may be backed up via manual intervention by operators, who can communicate over the telephone system Transfer of control When the primary fails, the backup site takes over processing and becomes the new primary When the original primary site recovers, it can either play the role of remote backup, or take over the role of primary site again In either case, the old primary must receive a log of updates carried out by the backup site while the old primary was down The simplest way of transferring control is for the old primary to receive redo logs from the old backup site, and to catch up with the updates by applying them locally The old primary can then act as a remote backup site If control must be transferred back, the old backup site can pretend to have failed, resulting in the old primary taking over Time to recover If the log at the remote backup grows large, recovery will take a long time The remote backup site can periodically process the redo log records that it has received, and can perform a checkpoint, so that earlier parts of the log can be deleted The delay before the remote backup takes over can be signi cantly reduced as a result A hot-spare con guration can make takeover by the backup site almost instantaneous In this con guration, the remote backup site continually processes redo log records as they arrive, applying the updates locally As soon as the failure of the primary is detected, the backup site completes recovery by rolling back incomplete transactions; it is then ready to process new transactions Time to commit To ensure that the updates of a committed transaction are durable, a transaction must not be declared committed until its log records have reached the backup site This delay can result in a longer wait to commit a transaction, and some systems therefore permit lower degrees of durability The degrees of durability can be classi ed as follows One-safe A transaction commits as soon as its commit log record is written to stable storage at the primary site
Copyright © OnBarcode.com . All rights reserved.