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The real world is complex and dynamic, most of the work of scientific research is to realize the formal description of the real problem and establish the model. The model is a description of the essential attribute of a system in some form, in order

Managing the operating mode of informix-online dynamic servers 1. Online mode of operation Off-line (offline mode) quiescent (static mode) On_line (Online mode) Shutdown (off mode) Recovery (Recovery mode) Online system has the following

The development of database application system is a software engineering. Generally can be divided into the following stages: 1. Planning 2. Demand Analysis 3. Conceptual model Design 4. Logical Design 5. Physical Design 6. Programming and

The use of the shell to achieve Informix performance monitoring, and output in HTML format, intuitive and convenient. It is suitable for monitoring system performance when Informix system is first built. This example is designed according to the

How to troubleshoot debug VIP problems: -----View statistics for node application resources: /u01/crs/bin/srvctl config nodeapps-n dbtest2-a-g-s-L VIP exists.:/dbtest2-vip/10.11.11.198/255.255.255.0/eri0 GSD exists. ONS Daemon exists. Listener

Some time ago to do some of the SSD optimization work, SSD's biggest problem is that after a long time use, IO performance will drop dramatically. The main problem is that in order to prevent the "write amplification" problem, SSD firmware uses a

Distributed replicated Block Device (DRBD) is a software-free, shared-sharing, storage-replication solution that mirrors the contents of a piece of equipment between servers. Data mirroring: Real-time, transparent, synchronous (returned after all

As a basic concept of it, "virtualization" has been used for more than 30 of years. However, virtualization has blossomed in recent years as a technology that directly helps enterprise users reduce IT costs, improve competitiveness and profitability,

In the IT field, capacity management can be interpreted in many different ways, depending on the area and focus of your attention. Full capacity management centralizes the capacity management projects that are most heavily applied in the data center,

The network is born for sharing, but today's network has long gone beyond sharing. The total cost of network printing solution is low, and the efficiency is high, which provides a better choice for enterprise users. From a cost point of view,

First, the network of Office environment caused by the harm With the popularization of Internet access and the increase of bandwidth, on the one hand, the conditions for employees to access the Internet improved, on the other hand, to bring higher

Written by Colin DeVilbiss, this blog is an IBM software engineer who works at the Rochester Research and Development Center in Minnesota, mainly for IBM I development communications device drivers. Thank Colin. On 7.1 Technology Refresh (TR) 3,

1. Preface The Next Generation Network (NGN) is an integrated and open network architecture which can provide a variety of services including voice, data and multimedia, and SoftSwitch is the core of the next generation network call and control,

Operators generally according to the requirements of the city network construction and market users gradually increase the trend, and strive to build a high-speed, high-capacity, broadband, high reliability of the sustainable development of

1 Multimedia service drives the development of OFDM technology Orthogonal Frequency Division Multiplexing (OFDM) is a multicarrier digital modulation technology whose research history dates back to the mid 1960s, although the concept of OFDM has

In recent years, the mobile communication field presents the trend of data and broadband, WiMAX adopts multicarrier modulation technology, which can provide high-speed data service, and has the characteristics of high frequency spectrum resource

GPRS network optimization is more complicated than GSM network optimization. GPRS system with GSM network as the bearer network, using the existing GSM wireless network, GPRS and GSM share the same base station and spectrum resources, which

TD-SCDMA is "time division-synchronous code Division Multiple Access" abbreviation, the Chinese meaning is "cent synchronous code division multiple Access", this communication technology also belongs to a kind of wireless communication technical

With the rapid growth of data business, the opening and formation of market competition, and the emergence of various new technologies, the network structure is also evolving. The data business includes the high-speed Internet of individuals and

Automatic Switched Optical Network (ASON) is the core transfer technology of NGN. This technology is based on the traditional optical network (SDH, DWDM, OTN, etc.), by introducing the control plane to make it have intelligent function, that is, the