Query Metrics to Help Optimize Database Applications

Ideally, the efficiency of an application is optimized at the design stage, when the application is just being created. It is much cheaper and easier to make changes to an application at the conceptualization and coding stage. However, in most cases, an application that needs to be made more efficient is already in existence. Furthermore, usually the application is already under use, and a total redesign is not an available option. In this case, it becomes important to be able to identify which areas or aspects of the application are contributing to its inefficiency.

Now, for database applications, no matter how complicated its structure might be, the core performance issues usually arise at the database level. That is, the efficiency of database access more or less determines the overall application performance. Accessing the database, especially if the database is very large and accessed many times, is the most demanding task.

It then becomes important to consider the relevant metrics regarding queries in order to trace database performance. By looking at how well the various running queries are performing, it becomes possible to determine whether any inefficient behavior is occurring. It also becomes possible to pinpoint any inefficient behavior right to their source, to the type of queries that slow down database performance.

One common problem that arises in SQL databases is what is known as “session blocking”. This occurs when two separate SQL sessions attempt to access the same block of data simultaneously, while also putting a lock on this data. Then one session would have to wait until the other releases the data to be accessible to others again. Session blocking can be determined by querying the sysprocesses table. Patterns and the various metrics can be obtained, and the session blocking behavior can be traced to its root.

A Good Fit For Portable Mixed Signal Designs

What is really remarkable is the true low power consumption by these devices when idling as well as when they are delivering processing power. These devices can retain data available on the system RAM at current levels of as low as 0.1 micro Amp, 0.8 micro amp real time clock mode and delivers full processing power at 250 micro amps per MIP. The family delivers 16 bit RISC MIPS from 8 to about 25 for a range of applications. Thus embedded systems, particularly the portable types that use battery power can easily live on that kind of power for a long time.

The ADC and the DAC devices provide interface with the analog world. Timers both real time and general purpose can provide various timing requirements of an embedded system. Watch dog timers make sure there are no latch ups in the software operation. Flash memory controller, DMA controller control on board resources. LCD controller, when available on the chip provide interface to LCD displays. Digital I/O and USART devices take care of communication with the external world. The USART device may be available as an UART, UART configured for SPI communication or a UART configured for I2C communication. Hardware multipliers in some of the devices can ease calculations of numbers including scaling etc that are frequently required in instrumentation designs. A JTAG access helps development, during the debug phase and field maintenance too.

Architecturally all the resources are connected via a system address bus and a system data bus in a classic von Neumann fashion. While the data bus is 16 bit connecting Flash, memory or ROM/OTP resources an adaptor scales it down to 8 bit operation for connecting with the devices on-board. Thus all these devices are straight memory mapped. The flexible interrupt structure helps implement real-time monitoring and control quite easy to implement. The programming model is that of a linear space that includes the special function registers (The PC, SP and so on), general purpose registers, the peripherals ( both 8 and 16 bit), memory resources and interrupt vectors. SFR occupy the lower end of addresses while the top end is occupied by the interrupt vectors. Besides the ALU there are 16 registers of which two are assigned to the Program counter (PC) and the Stack Pointer (SP) and a status register. Couple of registers does dual duty as constant generator 1 & 2. The rest are fully general purpose registers.

Friendster Login Problems and Friendster Proxies

1. Wrong Friendster Login Used

In today’s world when you have dozens or more user names and passwords to remember, it is easy to forget your login, or to confuse one with another. It is stupid to use the same logins for all your password protected websites and pages, and occasionally you get it wrong.

This is the simplest of the login problems to resolve: click on the ‘forgot password’ link under the login box, and Friendster will email you your password. If you have lost your email address, then you have problems! You will have to re-register with a new email address and then invest in password security software that stores your login details and auto-fills login boxes for you.

2. Breaking Friendster’s Terms of Service

If you seriously breach Friendster’s Terms of Service, such as any of the list of prohibitions, you can have your subscription cancelled. You could appeal against this if you feel it is an error, but you will generally be unsuccessful. Social networks operate on trust, and any breach of that is unacceptable. Learn the TOS and stick to them – ignorance is no excuse. You will find the TOS in the navigation at the very bottom of each page.

3. Access Denied

Many employers and educational establishments such as schools and universities prevent Friendster access by denying access to the Friendster website. A Friendster login is impossible when the computer you are using identifies Friendster, or a specific IP address, as the target site. However, there is a way to overcome that: by using a Friendster proxy.


The way a Friendster proxy works is easiest explained thus:

The computer you are using is A. Friendster is B, with an IP address of IPB. You find a proxy site C with IP address IPC, and access it. Your computer recognizes that you are accessing site C with IP address IPC.

Are Computer Services For Laptops Too Expensive?

Are computer services for laptops really too expensive? The usual mindset of users is that it is practically cheaper to replace a unit than to have it fixed, in case there are problems. However, computer experts assert that it may depend to the extent and nature of the defect or problem. Of course, major repair would cost greater than minor ones. There are defects when there is a need to replace parts. This makes costs higher. Replacements of parts could cost more because such parts are usually not widely available in the market. They are ordered specifically and especially from certain manufacturers.

There are also modifications and unique designs and structures of laptops based on brands. This further makes repair costs higher. Sometimes, damaged parts have to be ordered or bought from the suppliers of the brands. At times, it may take longer to find and buy damaged parts, especially when the model or brand turns obsolete.

For software upgrades and installation, it is just normal that such tasks are requiring higher fees. Legitimate software are premium priced because they cover taxes and other charges. The labor costs of computer services also add up to the already high prices of repair.

Nashville computer repair shops are usually offering basic and major laptop repair services. In this way, many users are resorting to repair instead of buying replacement. It may cost some dollars, but users know that in these times of crisis, there is a need to halt purchase plans and instead make do with what they have. If repairs are minor and are not costing too much, they are usually preferred.

Laptop users in the surrounding areas also go to Nashville computer repair shops. However, because dropping by the shops’ locations could be tedious and time consuming, many clients prefer home services. It is just logical that home repair computer services are costing more because there are additional charges. This makes more people conclude that laptop repair tasks are very expensive. If you want to save a few dollars, you should aim to drop by and bring the laptop to the sites of the repair shops.

Using the Design Principle of Contrast in Digital Creations

The most common mistake in using contrast is actually not making items different enough. If a reader comes across text that has a slightly larger heading size than the size of the body text, then it causes confusion. First of all, the reader may not even notice the difference and therefore not realize that the heading is in fact more important than the text below it. Others may notice the difference but be uncertain if it was intentional or not. You want to design each page of your creation so that it flows without having any technical errors to distract the reader from fully comprehending the purpose of that page.

A good example of contrast would be a list and its heading. The size of the font for the heading should be much larger than the text in the list. If it is the same size, or even close in size, it will cause the heading to ‘hide’ and be less noticeable since it blends into the list. In this particular scenario, the use of emphasis, like bold or underline, would help the heading stand out from the body from the text below. It would also be wise to leave some space between the heading and the text as well. The ‘white space’ it creates would also add a bit more contrast between the two elements.

Contrast is also important when dealing with pictures. Obviously pictures need to be sized large enough to be viewed easily but contrast between pictures can also affect your reader’s attention. When working with multiple pictures, try to pick one that emphasizes the purpose of the page or project. Make it larger than all other pictures within sight. This will cause reader’s eyes to naturally look at the larger (and more important) picture first. Using the other pictures in a smaller size allows readers more visual information without distracting from the emphasis on the larger picture.

Contrast can also be used between items on the page and the page itself. Unused space in your project is called ‘white space’ (even if it isn’t white). It is a term referring to the areas between text bodies, pictures and the edges of the project. The use of white space can create contrast with page objects. The more white space around a specific object the more it will stand out. This may be better explained by mentioning the opposite. Have you ever seen a project that was too cluttered? Nothing stands out and your eyes don’t know where to look first. A cluttered page has no white space. Here is a unique example to help you understand how contrast can work with the piece size. Often, t-shirt designers will use huge block letters in order to get your attention. The contrast is the size of the letter compared to what you would normally expect to see on a shirt. I once saw a t-shirt that had an entire paragraph crammed into a circle the size of a quarter on the front. Surprisingly, the shirt gained more attention than those with big block letters. Why? The amount of space around it combined with the unexpected small size of the text caused people’s attention to be draw to the dot of text.