plotter pros

Now say the common editor, and we compare the differences between the editor and the pros and cons, I usually use the editor is vim, of course, there are many editors. On this blue planet, there are legends of two great artifacts: Emacs is said to be the editor of God, and Vim is the god of the editor. Emacs is an operating system disguised as an editor There is an exaggerated saying: Emacs is an operating system disguised as an editor. It is not an

performance is also controllable (100 SQL statements interact once, even if the delay is increased from the same city 1ms to an offsite 50ms, also just increase 49ms, if the interaction 100 times, then increase 4900ms). In the Internet industry, where stored procedures are rarely used, one important reason is the widespread use of MySQL, while the MySQL stored procedure is weak (compared to a commercial database) and has a certain relationship with the changes in the Internet industry. Ci

the Key_len data column for the length of the byte count. For example, for an index of an integer data column, the byte length would be 4. If a composite index is used, the Key_len data joins can also see which parts of MySQL it uses. As a general rule, the smaller the value in the Key_len data column, the better (meaning faster).The Ref data column gives the name of the data column in the other data table in the association relationship. The row data column is the number of data rows that MySQ

change the value of the other fields in the record, the value of the DateTime field does not change unless you manually change it. Timestamp1. Take up 4 bytes of 2. Null values are allowed, but values cannot be customized, so null values are meaningless.3. The timestamp value cannot be earlier than 1970 or later than 2037. This indicates that a date, such as ' 1968-01-01 ', is valid for a datetime or date value but is not valid for the timestamp value, and is converted to 0 if assigned to such

data column gives the name of the data column in the other data table in the association relationship. The row data column is the number of data rows that MySQL expects to read from this data table when it executes this query. The product of all the numbers in the row data column gives us a rough idea of how many combinations this query needs to handle.Finally, the extra data column provides more information about the join operation, for example, if MySQL had to create a temporary data table wh

most widely used are Sybase 10 and syabse for SCO Unix.Features of the Sybase database:(1) It is a database based on the client/server architecture.(2) It is a truly open database.(3) It is a high-performance database.5.db2DB2 is a database management system embedded in IBM's AS/400 system, supported directly by the hardware. It supports the standard SQL language and has a gateway connected to heterogeneous databases. Therefore, it has the advantages of fast speed and good reliability. However,

processing, then using MyISAM is the best choice for performance. (3) The size of the InnoDB table is more large, with MyISAM can save a lot of hard disk space. In this 38w table we tested, the table takes up space as follows:Engine Type MyISAM InnoDBData 53,924 KB 58,976 KBIndex 13,640 KB 21,072 KBTotal space occupied 67,564 KB 80,048 KBAnother 176W record table, where the table occupies space, is as follows: Engine Type MyIsam InnordbData 56,166 KB 90,736 KBIndex 67,103 KB 88,848 KBTotal spac

:"Datasource=aron1;initial catalog=pubs;integrated Security=sspi;"-OR-"Server=aron1;database=pubs; Trusted_connection=true; "(Bothconnection strings produces the same result)(Useservername\instancename as Data Source to use an Specifik SQL Server instance,only SQLServer2000)3. Connect via an IP address:"DATASOURCE=190.190.200.100,1433; Network library=dbmssocn;initial catalog=pubs; Userid=sa; PASSWORD=ASDASD; "(Dbmssocn=tcp/ipinstead of Named Pipes, at the end of the that the Data Source is the

most efficient system, followed by const, EQ_REF, ref, range, index, and all, means that all records in the data table must be read once, corresponding to each record in the previous data table- This situation can often be avoided by an index). The Possible_keys data column gives the various indexes that MySQL can use when searching for data records. The Key data column is the actual mysql-selected index, which is given in the Key_len data column for the length of the byte count. For example, f

Label:TIMESTAMP4 bytes of storage; values are saved in UTC format;. Time zone conversion, which transforms the current time zone when it is stored, and then converts it back to the current time zone.Datetime8 bytes stored, actual format stored, time-zone independent, DateTime retrieves and displays datetime values in ' yyyy-mm-dd HH:MM:SS ' format. The supported range is ' 1000-01-01 00:00:00 ' to ' 9999-12-31 23:59:59 ' timestamp value cannot be earlier than 1970 or later than 2037IntSave time

, scalable.-Simple, weakly structured storage.-complex operations such as joins are weak.-Transaction support is weak.-Poor versatility.-Poor support for complex business scenarios without complete constraints.Although in the era of cloud computing, traditional database has a congenital disadvantage, but NoSQL database can not replace it, NoSQL can only be used as a supplement to the traditional data can not be replaced, so the disadvantage of avoiding the traditional database is the problem tha

Array Advantages: Fast query, if you know the index can quickly access the disadvantage: Delete slow, size fixed ordered array advantages: Faster than unordered array lookup disadvantage: Delete and insert slow, size fixed stack advantages: Provide last-in-first-out access method disadvantage: Access to other items is slow queue advantages: Provide first-in-out access method disadvantage: access to other The items are slow. List Advantages: Quick Insert, delete fast disadvantage: find slow (each

Atitit. Software Development GUI Layout Management Pros and cons summary java swing WPF Web HTML C + + qt php ASP. WinForm1. Absoluti layout (regular use) 12. Flow layout (infrequently used) 13. BorderLayout (infrequently used) 14. BoxLayout ( HTML default layout) 25. CardLayout (tab layout) 26. GridLayout 37. GridBagLayout 38. Fixed positioning (infrequently used) 31. Absolutilayout (often used)to set the div Property to Absoluti in Htmldefault layou

program is re-entered, you need to update the status in the main interface. For example, when I quit on my interface, the next time I log in again, if I don't update the state of the main interface. Will go directly to this interface about me. This demand is not the state we want.Let's look at the second architecture .　　It is clear that this architecture will be more clear and clearer. Let's take a look at the principle of this program: The architecture of this program is to manage the switch b

everything, and naturally, Youku players have some unbearable drawbacks.1. Youku will always be intermittent convulsions, for example, sometimes suddenly download can not choose a different definition, for example, sometimes suddenly video can not play, or can not open, connect not on the network .... And so on, it always makes me love and hate it, and a lot of times I want to complain.2. Youku player will take up a lot of computer memory after running too long in the background, slowing down t

Transfer from http://blog.sina.com.cn/s/blog_b5a157500101ld71.htmlservlet: is based on Java technology, applied to the server-side program components, the essence is Java code, for management and sub-Send a user request.servlet container : Used to manage servlets, including loading, instantiating, and destroying Servlets.Servlet Main Features:1, dynamically return the entire HTML page according to customer request.2, you can communicate with other resources on the server, including databases, ot

NAT is an address translation technique that works on routers where the internal network is able to access the Internet via NAT to an external network, and a NAT-installed router is called a NAT router.Because the current IP address is scarce and does not meet the luxury of one person (a,b,c Class) IP address, Nat solves this problem, but it also has its pros and cons.There are three ways to implement NAT , namely static translation of the statically

just a simple remote procedure call. Distributed systems also mean that developers need to consider network latency, fault tolerance, message serialization, unreliable networks, asynchrony, versioning, load, and so on, while faced with so many microservices need to be distributed, the entire product needs to have a complete set of mechanisms to ensure that each service can function properly. transactional, asynchronous, test-facing challengesCross-process transactions, large amounts of asynch

1. Advantages and disadvantages of Microsoft TFS:Advantages: It is the support of agile, Msf,cmmi and other projects, process management, process improvement. On the task page, you can take a glance at the requirements and project progress, which is more useful for small teams than Gantt charts.Cons: The number of teams and companies that can be applied is very small, most really used, that is, the source code management part, which is only a small part of the TFS function.2. GitHub's

What about the CodeIgniter framework? What are the pros and cons? I heard that his session was not very useful. Reply content: What about the CodeIgniter framework? What are the pros and cons? I heard that his session was not very useful. Advantages Introduction, Elegance. In those PHP framework, it can be said that the mode of thinking of CI is closest to PHP junior programmer, so many PHP programme