Topic: Green Dam How unfortunate?

Very sad, green dam has not been formally published, they were gang resigned to nothing.

Green Dam anxious to be eradicated people about for several reasons: First, some people say the Green Dam can shield the pornographic sites, which prevents them from certain requirements; Second, some people say the Green Dam prevented the network free hinder the freedom of speech, the installation of the green bar will be monitored. Therefore, many people strongly opposed to the green bar, against the government regulation on the Internet.

Green Dam is shielded sexual content, because the green bar itself is tailored for the protection of minors and the software. This is the fundamental purpose of the Green Dam available. If adults feel that green bar the way of her, can a discharge is over. Any country, any government will be the protection of minors as a very important and urgent task. This is the case of China, the United States but also the case in Europe, no exceptions. Our neighbors South Korea, to the health of the Internet, on more than 20 million people visit the site, have long practiced real names. However, primary and secondary students in China is to provide a healthy and convenient online green space, it was such a denigration How unfortunate?!

Some people not only against the green bar, many people abroad against the green bar, here including the promotion of "network without borders," Microsoft, as well as Western countries and has consistently called for "freedom and democracy" in the media. To be honest, I did not think the West will have a software so interested in China, even before understanding the green dam their "exaggeration." But seriously, one would think, naturally, the Western community, particularly the Western media would like to wear the "colored glasses" view of China. They are used to using the Internet to "change the" other "unfriendly" or "disobedient" countries. Far, former U.S. Secretary of State Madeleine Albright once hopes to use the Internet, "change" the Communist regime; close, and now the Iranian situation so chaotic that U.S. popular social networking site "Twitter" on "ordered" as a non- glorious role. In view of this, we is not difficult to imagine why the West is so interested in the Green Dam. This I do not know the Green Dam lucky or unlucky?!

Green Dam is not some people's "imaginary enemy", nor of the West, "the latest discovery", it is only to protect China from online pornography to minors harmful software, is to create a web of green space and health of the software, only this only. NPC does not like it can "give up as cover fit the shoes", as installed or not installed, complete our free, others do not worthwhile to make irresponsible remarks, as he does not want equipment to make irresponsible remarks on the other, like the Green Dam.

The recent "Global Times" an article commentary entitled "Do not misuse freedom is the best protection," This represents the relationship between freedom and regulation. Freedom be abused, will inevitably lead to stricter regulation, as South Korea, like real-name system. I think, in July, a number of green dam system is unloaded is inevitable. There is a saying, but I have to say: We can not have visible green bar, but did not must not mind the invisible Green Dam. This is for children, but also for ourselves, even we can not leave the Internet.








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New Computer EDUCATION

Easy to master with your line of sub-chain migration concepts and action

In practical applications, if the line sub-chain and line relocation is frequently removed, it may not be reused block free space, so in this case, we should make use of space, you can set the pctused high point during the operation mainly in the INSERT trigger line sub-chain operation. The line of migration caused mainly by the UPDATE operation.

Bank Link

Line links: Insert or Update cause, there is a different block of Row, row by different parts of different block address (ROWID) chain into a chain, can be set large DB_BLOCK_SIZE to reduce the occurrence of the link line, but can not be avoided (LOB) .

Bank Transfer: Update cause, as PCTFREE too small, ROWID unchanged, can be reduced by increasing the value of PCTFREE line of migration occurred.

Line sub-chain is not big enough DB_BLOCK_SIZE settings, so that the line for some big (like varchar2 (32666), blob, clob of length greater than the block size (eg 4K)) certainly can not save a block row, we need to keep separate line to a different block. in particular blob of this type, it is best to set up a separate table space to hold the actual data.

Contains a LONG / LONG RAW column, in this case, which is usually stored in the last Oracle maintain a LOB locator to allow quick access to the line outside the LOB. LOB locator, about 24 bytes, DISABLE STORAGE IN ROW save the line parameter to achieve outside the (scatter), regardless of data size of the row sub-chain is difficult to control (unless DB_BLOCK_SIZE by choosing large enough, can hold the line It is usually impossible). However, the line moved through the CREATE / ALTER TABLE command parameters PCTFREE and PCTUSED effective control.

Another line of links is the line occurred in the conduct of successful migration, such as UPDATE operation caused. When the update line to increase the size of the current free block is not enough space to lay down the line, then put the whole line to take out adequate space into a block (if not block up the necessary space for the entire line, line be divided into chain; if even if it is divided into chains still not enough space, then an error message "ORA-1650-55: Unable to extend).

Bank Transfer

If we want to update a row (update always allowed), and its line up, while the increase of the line is larger than the space required for block of free space. If we put a line in the extra space into another a block, while another line on the original block (which is the line of sub-link), so that block 100% of the original fill. This seems to only happen in a separate row, ORACLE will move this entire line to the other block can accommodate the space (this is the line of migration). This will remain in the original block in a line head, the first in line to retain the put the address of the actual line of block. The line links, but the application never know, use the SQL are no different, he just performance reasons. If the index to read through this line, the index will point to the first new block Not only is the use of two IO read about the index, plus a 1 IO to read this table to keep using PCTFREE free space per block, allowing line is still in the original block, do not control this expansion.

If PCTFREE is 0, then all the free space will be used INSERT, UPDATE will line up to move to another block to fit the needs of expansion.

In the ideal case, set PCTFREE for the median size in line with the maximum values. For example, if the size of the median line is estimated at about 900 bytes, maximum line size of 1255 bytes, then set the PCTFREE value 10 (default) and 30 between the more reasonable.







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