Xem 1-20 trên 74 kết quả Data failures
  • After completing this lesson, you should be able to do the following: Describe the factors that affect planned and unplanned downtime Describe the basic components of Oracle Data Guard Explain the differences between physical and logical standby databases Explain the benefits of creating a Data Guard environment Explain the use of Data Guard in high-availability architectures

    ppt20p nghianguyenluong 30-06-2009 256 91   Download

  • For small, medium, and large businesses, it is critical to provide high availability of data for both customers and employees. The objective behind disaster recovery and business continuance plans is accessibility to data anywhere and at any time. Meeting these objectives is all but impossible with a single data center. The single data center is a single point of failure if a catastrophic event occurs. The business comes to a standstill until the data center is rebuilt and the applications and data are restored....

    pdf100p minhthanh 11-08-2009 80 14   Download

  • Frequently, the only protection for a URL is that links to that page are not presented to unauthorized users. However, a motivated, skilled, or just plain lucky attacker may be able to find and access these pages, invoke functions, and view data. Security by obscurity is not sufficient to protect sensitive functions and data in an application. Access control checks must be performed before a request to a sensitive function is granted, which ensures that the user is authorized to access that function....

    doc3p d15tmt 01-04-2011 46 5   Download

  • Immune-Mediated Injury The recovery of marrow function in some patients prepared for bone marrow transplantation with antilymphocyte globulin (ALG) first suggested that aplastic anemia might be immune-mediated. Consistent with this hypothesis was the frequent failure of simple bone marrow transplantation from a syngeneic twin, without conditioning cytotoxic chemotherapy, which also argued both against simple stem cell absence as the cause and for the presence of a host factor producing marrow failure. Laboratory data support an important role for the immune system in aplastic anemia.

    pdf5p thanhongan 07-12-2010 29 3   Download

  • We describe the use of XML tokenisation, tagging and mark-up tools to prepare a corpus for parsing. Our techniques are generally applicable but here we focus on parsing Medline abstracts with the ANLT wide-coverage grammar. Hand-crafted grammars inevitably lack coverage but many coverage failures are due to inadequacies of their lexicons. We describe a method of gaining a degree of robustness by interfacing POS tag information with the existing lexicon.

    pdf8p bunrieu_1 18-04-2013 14 2   Download

  • This handbook is intended to help engineers in industry with the operation and maintenance of machinery. It gives the information that these engineers need in a form that is instantly accessible and easy to read. The manufacturers of machinery provide guidance on the operation, lubrication and maintenance required for their particular machines.

    pdf265p beobobeo 01-08-2012 64 29   Download

  • The microcontroller is an exciting new device in the field of electronics control. It is a complete computer control system on a single chip. microcontrollers include EPROM program memory, user RAM for storing program data, timer circuits, an instruction set, special function registers, power on reset, interrupts, low power consumption and a security bit for software protection. Some microcontrollers like the 16F818/9 devices include on board A to D converters.

    pdf320p nguyenthai_thinh 16-03-2013 54 20   Download

  • Structural Testing is used to verify the static strength, or fatigue strength of a component by applying measured loads to the test item. Testing can be done to failure, to contractual requirements or to validate finite element model predictions. DTB has successfully completed thousands of structural tests on items ranging in size and complexity from simple coupons to entire aircraft. Fatigue Testing is carried out with the objective of determining the relationship between the stress range and the number of times it can be applied before causing failure....

    pdf114p phongk2t1 20-12-2010 78 18   Download

  • This manual explains why Windows slows down and what you can do to prevent this from happening too quickly. We will explain how to store your data to reduce disk fragmentation, how you should properly remove programs to avoid registry junk, which system maintenance tools you should use to maintain a top notch performance, how to protect your system from malware attacks, and how to physically clean your machine to avoid hardware damage and failure.

    pdf39p ken333 14-06-2012 98 16   Download

  • The term “ smart grid” defi nes a self - healing network equipped with dynamic optimization techniques that use real - time measurements to minimize network losses, maintain voltage levels, increase reliability, and improve asset management. The operational data collected by the smart grid and its sub - systems will allow system operators to rapidly identify the best strategy to secure against attacks, vulnerability, and so on, caused by various contingencies.

    pdf233p nguyenthai_thinh 16-03-2013 36 14   Download

  • Coverage: In WSN, each sensor node is given a glimpse of the environment. This follows are limited in range and accuracy (Figure 1), it can only include a limited physical area of environment. Therefore, coverage is also an important design parameter in WSNs. Each node receives a local view of its environment, limited by the scope and accuracy of it. the coverage of a large area composed by the union of a number of smaller insurance. Connectivity: Most of the high density of WSNs sensor, thus preventing the isolation of the nodes.

    pdf312p samsungwifi 03-04-2012 38 8   Download

  • Whether a terrorist attack, fibre cut, security breach, natural disaster or traffic overload, today's networks must be designed to withstand adverse conditions and provide continuous service. This comprehensive, leading-edge book reveals the techniques and strategies to help you keep enterprise data and voice networks in service under critical circumstances. You learn numerous ways to minimize single points of failure through redundancy and backups, and discover how to select the right networking technologies to improve survivability and performance....

    pdf433p ken333 06-07-2012 41 8   Download

  • Finally, the requirements that a fund has to fulfill in order to be included in the SIF's listing of SRI funds are not stringent. For example, a fund could be on the list just by having a formal policy of excluding companies with interests in the tobacco business. If the constraints that SRI (as defined in our data set) imposes on fund managers are minor, the performance of SRI mutual funds should not be expected to be lower than that of conventional funds. It is important to highlight that the estimated performance differences between SRI and conventional funds cannot...

    pdf39p khanhchilam 29-03-2013 22 6   Download

  • Contents at a Glance 1 Troubleshooting Database and Server Performance 2 Analyzing Queries 3 Failure Diagnosis 4 Disaster Recovery 5 Performance Monitoring 6 Database Maintenance 7 SQL Server Integration Services 8 Design Data Integrity 9 Business Requirements 10 Replication

    pdf775p trasua_123 29-12-2012 24 5   Download

  • Policy-relevant background – This is an estimate based on air pollution models of the natural background ozone concentrations that would exist without sources of air pollution from human activity, and therefore cannot be affected by emissions control efforts (Fiore 2004).

    pdf40p saimatkhauroi 01-02-2013 16 5   Download

  • Our memory access mechanism provides hardware sup- port for unprivileged malicious software by allowing ac- cess to privileged memory regions. Malicious software triggers the attack by forcing a sequence of bytes on the data bus to enable the memory access circuits. This se- quence can be arbitrarily long to avoid false positives and the particular sequence must be agreed upon be- fore deployment.

    pdf8p nhacsihuytuan 06-04-2013 15 5   Download

  • Overview One of the major responsibilities of a database administrator (DBA) is to ensure that the database is available for use. The DBA can take precautions to minimize failure of the system. In spite of the precautions, it is naive to think that failures will never occur. The DBA must make the database operational as quickly as possible in case of a failure and minimize the loss of data. To protect the data from the various types of failures that can occur, the DBA must back up the database regularly. Without a current backup, it is impossible for the DBA to...

    ppt26p trinh02 28-01-2013 17 4   Download

  • Given the range of content available to internet users at effectively zero cost compared with those available to purchase through established social networks, a rational, economic decision would be primarily to use the internet to obtain counterfeit digital goods. However, our data shows this is not the case, suggesting that purely economic approaches to the purchase of counterfeit goods have limited value in explaining consumption patterns. Further, accessing illegal content via the internet offers an element of anonymity to users.

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  • All these changes have a huge impact on the way the database query optimizer works. Having user-defined functions deep in- side the query plans makes cost estimation problematic. Having real data with high skew has always been problematic, but in this new world the relational operators are just the outer loop of a non- procedural program that should be executed with the least cost and in parallel. Cost-based static-plan optimizers continue...

    pdf19p yasuyidol 02-04-2013 29 4   Download

  • Extent of knowledge sharing: Related to the above problem is the question of how much knowledge is available to the system during its query optimization process. In particular, the first step in choosing a query evaluation strategy is likely to be identifying which nodes have materialized views that can speed query processing. A simple technique would be to use a centralized catalog of all available views and their locations, analogous to the central directory used by Napster. Yet this model introduces a single point of failure and a potential scalability bottleneck.

    pdf25p yasuyidol 02-04-2013 15 4   Download

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