Thursday, October 21, 2010

Individual Character! Avant Browser Skin easily create



The author is a loyal overseas customers Avant Browser is a fan of the letter of the skin. The software installed on the system, both instant messaging tools, all kinds of audio and video tools, or input method, use is unique skin, the young must individuation Well. Many use the Avant browser, friend might ask, from where the skin can be downloaded to the Avant documents? Downloaded from the Internet, so OUT of it, these days are particular about a "do it yourself and clothing." We should be pleased that, Avant offers a completely free Skinmaker.

Tip: Avant is a very high popularity in the United States the use of IE as the core browser software, which is a Chinese-American author of the software is small, less than 2MB. According to the data from the first download site Download.com, the current Avant browser 24,024,668 downloads firmly ahead of the amazing title of browser software, and Firefox as we know, travel, Opera thrown far behind. It can be said, Avant Browser is very popular in the United States shall browser software.

Skinmaker the body is very slim, only 900 Kb, download back extract to any folder and run abskin.exe to start the skin editor (Figure 1). Process the lower right corner of the skin editor to set options related to the menu and the upper is the effect of the preview area on the left is the prompt area. Do not be intimidated by the software interface in English, in fact, very good Skinmaker ease of use, even if such standards as the English writer blind, you can quickly get started.

Figure 1 Avant Browse skin production



Here we set the options one by one to understand the specific function: Visual Style The following shows the different visual styles, after clicking on the side of the area can be shown in the results; click on an icon, choose the appropriate picture file replaces the original icon. Pictures of different locations, different scales: large toolbar icons: 24 pixels by 24 pixels; small icon toolbar: 16 pixels by 16 pixels; system toolbar buttons: 13 pixels by 13 pixels; other icon sizes shall be as follows: 16 pixels by 16 pixels. For the image format, PNG format is recommended. How to get PNG format pictures? Run Photoshop software, open a picture file, click the File menu, choose Save As command (shortcut key is Shift + Ctrl + S), pop-up dialog box shown in Figure 2, select the PNG format can.

Figure 2 pictures saved as PNG formats



Tips: PNG image is lossless compression image format, picture quality very high, and Alpha channel PNG support transparent manner, it can be achieved with the interface elements (such as buttons) translucent effect. A variety of Windows platforms, PNG support is not exactly the same database performance. Therefore, we recommend using PNG format images as the button's icon.

Not only can change the icon, even font color of the toolbar at the progress of loading, the top and bottom of the background can be easily personalized changes. For example, change the page load progress display color, can directly click the color under the Progress Bar Color button, select the appropriate color can be (Figure 3). When Save the skin file and set as the default skin, open a new page will display the progress of their loads defined color (Figure 4), how, very comfortable, right? Other relatively simple set of methods, not repeat them here . Can play to their wisdom, to customize the unique skin.

Figure 3 Select the appropriate color



Figure 4 defines the load progress of the color of their own



Upon completion of all the settings, do not forget to save a good production of the skin file, click the Save button and enter the file name. Save address of the proposed installation directory into the Avant Skins folder (Figure 5), then the Avant browser from the "Tools - skin" Direct call (Figure 6), a complete mapping of their own skin on into the eyes of the. If you make a good skin, may wish to submit to the Forum and the majority of Avant Avant fans to share under a lot of skin can be produced here, oh master.

Figure 5 produced a good save the skin file



Figure 6 has been called the skin









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Monday, October 11, 2010

SYBASE Services


Services

This article describes the database transaction isolation level on the impact of the lock, by comparing the transaction isolation level 0 and 1, to understand the relationship between the lock and dirty time.

Experiment: set 0 and 1 respectively, isolation level, the implementation of two different but related issues there. The experimental environment is as follows:

1, the right to access the user database (in this case aca_database) and modify database tables and queries have permissions.

2, the database contains tables auths, including salary column (data type is money), there is a certain amount of data (in 1 million lines).

Steps:

1, as in the same machine, can be performed separately two "SQL Advantage", respectively legitimate account login, prepare their own implementation of a transaction.

2 Open the user interface in their database aca_database, set the isolation level to 1 (also goes for the default value):

set transaction isolation level 1, see the current isolation level using select @ @ isolation

3, the implementation of the first two sentences of the first transaction, suspending and later committed or rolled back.

begin transaction

update auths set salary = salary +100

commit transaction

(Rollback transaction)

4, the implementation of the second transaction select sum (salary) from auths

5, the end of the normal execution of a transaction, but only changes in the memory buffer to complete the transaction and did not really end, do not release the corresponding lock, the second transaction in the wait state. Executable sp_lock and sp_who command.

6, step 3 in order to submit or rollback, the second transaction to be implemented.

7, to change the transaction isolation level is 0, repeat steps 3-4. No change in the first transaction, the second transaction will soon come under the first transaction is made to modify the data results, it seems that the implementation of the response on the first transaction is not subject to influence.

8 Repeat step 6 the end.

Through the above experiments we know that:

1, transaction isolation level 0 allows dirty read transaction isolation level 1, does not allow dirty read, but rather wait for real before the end of a modified transaction and release the lock.

2, isolation level 0, if the modification is to rollback the last transaction, then the query time transaction will not read the correct data.

3, satisfied that there is no rollback transaction possible, and called for greater efficiency and parallel implementation, only then we may consider setting isolation level to 0.






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