o o defrag review

Tags: varchar uniq review weight Zhang Mowgli add PNG code CREATE databaseAfter the cmd command to enter the database, you need to manually do some operations on the database Create a database plus a semicolon MySQL>Createdatabase myfirstdatabase; View the database you created plus s and semicolons MySQL>show Databases; Select the database plus semicolon to use MySQL> use myfirstdatabase; Create a database table plus a semicolon, and add character fo

Originally learned time, quite smooth, did not expect to use again, or encountered a lot of problems, resulting in the failure of the update, so, can only reconstruct the migration, so as not to look at the chaos.First, delete the migration, restore the data to the (a) End state1. Delete Folder2. Delete a table3. Delete Columns4. Comment out the newly added attributesSecond, re-operation EF6 in the original database using Codefirst Total review (secon

Tags: name login list Practice COM label Message Info user A bit with the original database in the use of codefirst far, but always review it, must be comprehensive point. One, insert two users in the user table (users) Second, generate the Post interface MVC generates a lot of interfaces and doesn't use Ajax, which is rarely used in real-world development, just for demonstration purposes. But no matter what the build, attributes, entity objects, etc

This is my second blog in 51, mainly to review my it career, first after graduation I engaged in ERP development, involving large enterprises of human resources management, logistics management, production management, finance and other fields, the front desk will make form, report. The background will write stored procedures and so on. In the software development process I participated in the whole process of software including: Demand research, summa

Disclaimer: This article is for the author to review the database course with a simple record of notes, if there are errors, please point out, thank you.First, the theoretical basis1. non-destructive connectivity (Lossless join): Set relationship mode R (u,f) is decomposed into several relational patterns R1 (U1,F1), R2 (U2,F2), ..., Rn (UN,FN), where u=u1u2 ... Un, and there is no Unuj, FI is the projection of F on the UJ, if R is equal to the result

Review database Connection pool: C3P0, DBCP1, the advantages of database connection pooling technology:• Resource reuse:Due to the reuse of database connections, there is a high performance overhead associated with frequent creation and release of connections. On the basis of reducing the system consumption, on the other hand, it also increases the stability of the system operating environment.• Faster system response Speed:Database connection pooling

"Cleanmymac" and run to clean up binary code, system cache, logs, language, garbage, garbage, etc. CLEANMYMAC also has device management, fast and permanent erase and extension manager, while allowing for custom appearance modifications. Currently, the clean My mac contains more than 50 features in maintenance, monitoring, cleaning, utilities and feedback categories.Cleanmymac and MacKeeperAny good "Cleanmymac" commentary will compare it to its biggest competitor, MacKeeper, and that's why I'm

=============================================================================VI/VIM Command Review and Practice:---------------------------------------The Command mode yy copies the contents of the line where the cursor is located 4yy the copy cursor is located on the line starting with the 4 line of content p paste dd Delete/cut the contents of the line where the cursor is located 2DD Delete/The cut cursor is located on the line where the 2-row cont

Tags: database view sqlDatabase review concept of CH6 view 6.1 viewA view is a virtual table that is exported from one or more tables (or views), and the DBMS only holds the definition of the view in the data dictionary , and the view's data is still actually stored in the base table where it was exported The basic statements for defining views in Tutorial D are as follows: view_name> VIEW (relational_condition>) {property_list>}; So what does a view

Tags: database transaction SQL SQL transactionDatabase review CH13 Transaction 13.1 ConceptsA transaction is a series of database operations performed as a single logical unit of work that may modify multiple tuples in multiple tables The structure of the normal execution of a transaction is: begin; 1 2 ... SQL execution N commit; The BEGIN flag starts a transaction, and multiple SQL statements are transactional logical units of work, commit(commit) i

Database Review CH2 Database Architecture 2.1 Database Architecture hierarchyA database architecture can be divided into 3 tiers: External level Conceptual hierarchy Internal level The external hierarchy refers to the interface that each user accesses the database in different high-level languages, the representation of the conceptual hierarchy database information, and the definition of the module (including security and integri

We often hear team members say: "This project is a waste of time doing code reviews. ” "I don't have time to do code reviews. ” "The conference was delayed because my despicable colleague had not reviewed my code. ” "Can you believe that my colleague actually asked me to change my code?" I'm so graceful and perfect where the code needs to be changed. ” Why do we have to do code review? One of the most important goals of any professional software dev

First, I started in September 2015 to prepare for 803--, which is the computer science and technology major . Now smoothed the plan, I was the review of each of the subjects were divided into three paragraphs: the first stage, combined with the review of all the knowledge of the teaching materials to all-round scanning, fully understand and understand, in fact, follow the

Through this class library, you can automatically analyze the input content and give a score. The program can determine whether the content has reached a certain sensitivity level based on this score, so as to perform corresponding automatic processing. If such a database is combined with a manual review, the results will be very good: the suspicious content of the server review is automatically submitted

First, describe it, And then summarize it, and finally design and implement it. Statement: 1. Save the documents to be submitted. After the operator makes a ticket, he may go to the toilet. He is in a hurry. Just as he writes a ticket on paper, he has not confirmed that the ticket should be sent to the superior leadership for review. 2. Submitted by the operator, indicating that the documents can be reviewed and self-reviewed. 3. The first

Gerrit code review server workflow and principles the Google Android open-source project has two important innovations in the use of git. One is the repo introduced for multi-version library collaboration, we have discussed this in detail before. Another important innovation is Gerrit, the code review server. Gerrit is mandatory for the code review introduced by

Personally understood, code review has two functions: 1. Two people are always more thoughtful than one person, looking at the angle of the problem it is easier to find bugs or find simpler and more effective solutions. The so-called onlooker sees most is the truth. 2. Ideally everyone in the team is familiar with every part of the project, but when the project is large it is not realistic, and the code review