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and hurried to start work, which will affect the layout of your entire structure and may be difficult to carry out the work.Read and understand the UI design, subdivide the layout structure by design, and record design bugs that are difficult or impossible to implement. For design bugs that are too expensive to implement. Be able to propose and discuss de facto costs at a scheduled meeting, such as a confirmation that it cannot be achieved or that th

ALGORITHM=INPLACE supported for renaming agenerated column. ADD column Yes* Yes* Yes* No Concurrent DML is a permitted when adding an auto-increment column.Data is reorganized substantially, making it an expensive operation. is ALGORITHM=INPLACE supported for adding a virtual generated column and not for adding a stored generated column. Adding a virtual generated column does not require a table rebuild.

not apply if the table uses full-text indexing Set default value for column Yes No Yes Yes Modifying a. frm file, not involving data files Change auto-increment value Yes No Yes Yes Modify a value stored in memory without modifying the data file Add FOREIGN KEY constraint Yes* no* Yes Yes Disable foreign_key_checks, you can avoid copying tables Drop Forgien Key

of shopping guide superfluous courtesy! People have already been attracted. You have new choices for customers! This gives the customer a chance to refuse!A girl slapped a man on the bus and asked him why he was beaten. He said, "I don't think the zipper behind her is pulled. I helped her pull it, she turned and gave me a slap, and she beat me. I thought she liked not to pull the zipper, And then I pulled down the zipper behind her! She slapped me !"This male's mistake is superfluous courtesy!S

bypass many of the statement parsing and parameter handling in SQL Server.The T-SQL batch is a set of SQL queries that are submitted together to SQL Server to end with go. Go is not a T-SQL statement, but is a SQLCMD usage program and Management Studio recognition. Symbolizes the end of the batch. A T-SQL batch consists of one or more T-SQL statements. Statements or T-SQL statements are also independent and discrete in stored procedures (hereinafter referred to as SP). Capturing individual stat

also. It is because a big husband lives in a thick and thin state, but does not live in China. Therefore, you can use this method.[39] Those who once succeeded: the sky is clear, the Earth is Ning, And the god is spirit, and the Valley is profit. [All things are born.] Hou Wang thinks that the world is upright. One of them is also. That is, the sky is clear, and the earth will be split; that is, the earth will be restless, that is, the God has no spirit, that is, the fear of rest; that is, the

Tool Name Source Type Cost Feature Overview Winrunner MercuryCompany FunctionalityTest Expensive The most important function of winrunner is to automatically repeat a fixed testing process. It records a series of manual testing operations in the form of scripts and replays them in the same environment, check whether it is abnormal or not consistent with the actual results in the same environment. It can reduce the resu

mention a very interesting nature: the Sun is always in the purple MSI's children's palace, so it can be regarded as "crown prince."2013 lectures, make east to mention: according to the arrangement principle of anxing law, Purple Micro has three sons, respectively is the Sun, Wu Qu, Tian with. The Sun for the crown prince, can inherit the throne, so symbolize the noble qi , Wu Song for the second son, generally unable to inherit the throne, but can reigning, exclusive one party, free developmen

prepare something, what kind of standards to choose the custodian, in the actual operation should pay attention to what matters, etc. In particular, in the selection of custodians, the author of many of the friends of the business and server hosting related to their own servers have been hosted to different computer rooms, personal experience plus witness, can say to "choose a reassuring custodian" this topic deep feeling. First, the preparation before the trusteeship-------budget, in the compu

customer, the customer's answer back to the original point, "I first look at it!" "Not willing!" No! "All are rejected by the customer!" I usually call this kind of shopping as superfluous courtesy! Originally someone has been attracted, you have to let customers more new choices! Give the customer a chance to refuse!A man in the bus by a girl slapped two, others asked why he was beaten, he said: "I look at her behind the zipper did not pull, I helped her pull up, she turned to give me a slap,

A terminated object that is permanently memory heavy and unused will consume a lot of system resources. The. NET garbage collector puts it in the abort queue, and once the time is ripe, the object wakes up and invokes his finalize method to completely terminate him, but using this mechanism, you can put a resource-intensive class into an object pool and use it repeatedly throughout the lifetime of the program (the end sign is CL R does not believe that any of the application's roots exist in the

Tool Name Source Type Cost Functional overview WinRunner Mercury Ltd. Functional Testing Expensive to charge WinRunner's main function is to automatically repeat a fixed test process, which records a series of manual tests in the form of a script, replays in the same environment, and checks for anomalies in the same environment or where the actual results do not match. Can reduce the error caused by human fa

problem of transaction concurrency with the efficiency of the database, a variety of isolation levels have been designed: There are 4 isolation levels for the database transaction, from low to high, read UNCOMMITTED (reading uncommitted), Read committed (read commit), repeatable read (repeat read), Serializable (serialization), These four levels can solve the problems of dirty reading, non-repeatable reading, and Phantom reading one after the other. 隔离级别 脏读 不可重复读 虚

log, and because the temporary use of buffer pool causes a short period of performance to be affected. The above is only the implementation of the Online DDL, in addition to the lock option to control whether to lock the table, depending on the DDL operation type has different performance: default MySQL as far as possible to lock the table, but expensive operations such as modifying the primary key have to choose the lock table. LOCK=NO

unmanned veins, in addition to physical strength, almost nothing. The first year classmate party, I from the black: "I sit in the office of my two head muscle all to sit out!" A classmate acquaintance to ask me for a favor, I paste his face. "Don't you know I'm expensive?" I'm so talented, how do you treat me like a cheap labor? My heart often steeds but the face is calm. Endless Vicious Circle, no experience, no chance, no experience, continue to ha

, from personal computers to heavy duty medical and military systems. There is a common, unbreakable rule in this field: the cost of modifying the chip design after deployment is extremely expensive. It is therefore not surprising that the specification of microprocessors is typically formalized. A formal specification has great benefits because it can be explained and analyzed automatically. In the case of microprocessors, many aspects of the design

to multiple disks in parallel. So it has a high data transmission rate, but RAID0 improves performance without providing data reliability, and if one disk fails, it affects the entire data. Therefore, RAID0 cannot be applied to critical applications that require high availability of data.RAID1:RAID1 data redundancy through data mirroring, generating data that is backed up on two pairs of separate disks. RAID1 can improve read performance and can read data directly from the mirror when the raw d

When I was determined to learn about computers, I had not yet accepted the concept of pirated software. That year is 1991.When I really got in touch with computers, I also got in touch with pirated dos, tools, and games. But at the same time, we also came into contact with the genuine WPS-it was bought by the school.To be honest, schools can buy all kinds of expensive lab equipment and computers. Why not buy genuine software? It is estimated that the

writing a game called "Space Travel" for the Multics operating system. To keep the game going, he had to rewrite an operating system. When he went to apply for a computer, it was clear that the leader would not approve a computer for a game. The early computer is not as small as our current PC. At that time the computer was a Big Mac, and the cost of each was extremely expensive, and only businesses and research institutions could afford it.Digital E

characteristics of Chinese traditional culture, such as respecting teachers, thrifty, neighbourhood harmony and so on, still have practical significance today.This "Zhu Xi's family precepts" should be the "Zhu Zizhi motto", and the Song Dynasty Zhu's "Zhu Zi" is different, should be divided clearly. Song Ju "Zhu Xi's precepts" June of the expensive, benevolence also. The expensive of