salami slicing

MVVM decoupling Demo and blog introduction approach to slicing programming (AOP) Demo At runtime, the programming idea of dynamically slicing code into the specified method of the class, specifying the location, is the aspect-oriented programming. Aspect-oriented programming (AOP is the acronym for Aspect Oriented program), we know that object-oriented features are inheritance, polymorphism, and encapsula

Data fragmentation allows data storage to be controlled at the table level. "Table Fragmentation" is a feature of the Informix database. Users can group records or indexes in a table and store them in different locations so that data can be stored on multiple disks, thereby reducing competition for disk I/O. The scheme of data slicing and a set of dbspace stored in the fragment data constitute the "slicing

Read Catalogue Objective MyBatis The simplest step of implementing a table The way of separation Separated policy The problem of separation Principles of separation Ways to achieve separation Summarize ObjectiveAs a database, as a table in the database, as the number of users over time, one day, the amount of data will be very difficult to deal with the point. At this point only a table of data has been more than tens of millions, whether it is a query o

affect the MySQL dataArchitecture (MySQL performance Tuning and architecture design):Will the Waffle grid degrade query performance because of network access overhead? You can refer to the test results of the Waffle Grid DBT2 and evaluate the actual testb). Use the MySQL UDF feature to integrate with the memcached。 Memcached data is maintained by MySQL and application-side programs, and the application reads data from memcached, reads from MySQL server and writes data to memcached, and data is

1-based and some are not fixed. I think one of the reasons why I decided to use the 0-based index method for Python is the slice syntax of Python. Let's take a look at the slice usage first. The most common usage is to cut out the first n bits from the array or cut out n bits from the I bits of the number. (the former is actually a special usage of I = start bits. ). If you do not need to add an ugly + 1 or-1 complement to the table when using this syntax, it will be very elegant. Using the 0

can also start with index 1 and take out 2 elements:>>> l[1:3['Sarah'Tracy']Similarly, since Python supports the L[-1] first-to-last element, it also supports the inverse slice and tries:>>> l[-2: ['Bob'Jack'] >>> l[-2:-1['Bob']Remember that the index of the first element of the countdown is -1 .Slicing operations are useful. Let's start by creating a 0-99 series:>>> L = range (+)>>>1, 2, 3, ..., 99]You can easily remove a segment of a sequence by

Say, I am ready to put my front-end cultivation of the road slowly written out ~ ~ ~First of all, of course, the PS slice is the beginning of learning. Do not know how many colleagues and I, is from the PSD file slicing beginning of the front road, just beginning is also the egg ache for a long time, only to start slowly familiar with, here or to thank the original guide me to slice the university roommate, and those design to the person.Don't say muc

Thinning automatically detects the user's device type (that is, the model name) and only downloads the content applicable to the current device. In other words, if you are using an iPad Mini 1 (1x resolution and not a retina display), you will only download the files used for the 1x resolution (more details will be given below. Resources used by more powerful and higher-resolution ipad (such as iPad Mini 3 or 4) will not be downloaded. Because the user only needs to download the content require

relationship between length and capacity. The zero value of a slice isnil.lenAndcapFunctions will both return 0 for a nil slice. A slice can also be formed by "slicing" an existing slice or array. Slicing is done by specifying a half-open range with two indices separated by a colon. For example, the expressionb[1:4]Creates a slice including elements 1 through 3b(The indices of the resulting slice will be 0

June 9, 2017 17:57:55Task:Read the Advanced sectionNotes:1. By mastering Python's data types, statements, and functions, you can basically write a lot of useful programs.2. In Python, the more code is better, the less the better. The more complex the code is, the better it is, but the simpler the better.Based on this idea, we introduce the advanced features that are very useful in Python, the functionality that a line of code can implement, and never write 5 lines of code.3. It is cumbersome to

-because it is a front-end rendering display, easy to interact with, and can only control the style in the previous paragraph.Disadvantage-the backend and front end have pressure on the data and presentation data, and when the amount of data is particularly large, front-end rendering consumes performance easily. In this scheme, when we put shp vector data into a text file with certain algorithm, we can avoid the pressure of dynamically acquiring data on the service side, and also have the a

the following table, the use of slicing to achieve each function (one point per question, a total of 4 points)#li = [1,3,2, ' A ', 4, ' B ', 5, ' C ']# 1) Create a new list by slicing the li list l3,l3 = [' 1,2,4,5]# S1=li[0::2]# print (S1)# 2) Create a new list by slicing the li list l4,l4 = [3, ' A ', ' B ']# S2=li[1:-1:2]# Print (S2)# 3) Create a new list by

columns] Selection by Label¶ Selection by Label For getting a cross the section using a label in [[]: Df.loc[dates[0]] out[26]: A 0.469112 B -0.282863 C -1.509059 D -1.135632 Name:2013-01-01 00:00:00, Dtype:float64 Selecting on a multi-axis by label In [II]: df.loc[:,[' A ', ' B ']] out[27]: A B 2013-01-01 0.469112-0.282863 2013-01-02 1.212112-0.173215 2013-01-03-0.861849-2.104569 2013-01-04 0.721555-0.706771 2013-01-05- 0.424972 0.567020 2013-01-0

In the previous article, I introduced several forms of the classification of the library and play, but also focused on the vertical library brought about by the problems and solutions. In this article, we will continue to talk about some of the techniques of the horizontal divide-and-sink table. The origin of slicing technology Relational database itself is relatively easy to become a system performance bottleneck, single storage capacity, number of c

chunk of chunks of "data blocks" (tables), we cut these "chunks" vertically, and then scatter them across multiple database hosts. Such a segmentation method is a vertical (longitudinal) data segmentation. Advantages of vertical slicing The splitting of the database is simple and clear, and the splitting rule is explicit; The application module is clear and easy to integrate. Data maintenance convenient and easy to locate; Disadvantages of vertical

these "chunks" vertically, and then scatter them across multiple database hosts. Such a segmentation method is a vertical (longitudinal) data segmentation. Advantages of vertical slicing The splitting of the database is simple and clear, and the splitting rule is explicit; The application module is clear and easy to integrate. Data maintenance convenient and easy to locate; Disadvantages of vertical slicing