learn hadoop from scratch

###########################Oracle '-Create TABLE space###########################1. Create a table space test--Query the table space of the current databaseSELECT tablespace_name,extent_management from Dba_tablespaces;--Create a regular table space testCREATE tablespace TestDataFile 'F:\oracletesting\test. DBF' SIZE 100MAutoextend on NEXT 100M MAXSIZE 2048MEXTENT MANAGEMENT LOCAL UNIFORM SIZE 100KSEGMENT SPACE MANAGEMENT MANUAL;January 1, 2015 Thursday 22:09 02 secondsMindong in Hefei, Anhui Pro

supports triggers, stored procedures, functions, events, views, administrative users, and so on. It's also easy to use for beginners.　Its well-designed GUI allows users to create, organize, access and share information in a safe and easy way. Navicat supports Chinese and is available for free version. Http://www.navicat.com Mysqldumper uses PHP-based MySQL database backup and recovery issues. The hundreds of trillion database can be easily backed up and restored without worrying about inte

database storage structure and access policy.c, monitoring the operation of the database (System operation is normal, system efficiency), timely processing of the database system in the course of the problems arising from the operation.D, security management, through the system's permission settings, Integrity control to ensure the security of the system.E, daily maintenance.F. Management of database related documents.(2) System analyst and Database DesignerThe system analyst is responsible for

Yesterday wrote an Android Demo, the logic is probably from TextView get the value, and then processed and then put back into the TextView. The entire process is triggered by the onclick of a button.But in the process of debugging, a click button on the Force Close dialog box, looked at the long time only to find the problem, the original data type conversion of the exceptionThe original code:String number = (string) text_number.gettext ();The changed code:String number = Text_number.gettext ().

Learn android from scratch (Data Storage (2) Internal Storage. 36 .) CallopenFileOutput()With the name of the file and the operating mode. This returnsFileOutputStream. PassOpenFileOutput () creates a FileoutputStream object Write to the filewrite(). Create a Write object and perform data read/Write operations. Close the streamclose(). Close the link.The above describes the basic steps for saving data f

Learn android from scratch (BroadCast. 45 .) Similar to Service, there is also one of the four main components running in the background in android, which is broadCcast, but he does not need to consider whether there are accepted objects, just consider sending. We can use either of the following methods to use BroadCast: 1. Configure broadCcast in the configuration file. Second, bind broadCcast to the class

provides some performance improvements.Finally we get a very safe and well-structured code:;(function ($,window,document,undefined) {Our code:blah blah blah ...}) (jquery,window,document);And as for this undefined, it is very interesting, in order to get unmodified undefined, we did not pass this parameter, but received it when received, because the actual is not transmitted, so ' undefined ' that position received is the real ' Undefined ' out. It is a technology and a way of thinking that des

}); Topic.subscribe ("MM", function (text)//Accept message, first parameter is message name, second parameter is callback function {alert (text);});});Code Explanation:① initially has two buttons: "Test 1" and "Test 2". Test after 1 click Alert, Test 2 Click to create a New button (can be created multiple times), New button click after alert② about alert behavior: After a click is not a direct alert, but a push message via topic.publish. The first parameter of the push is the message name (uniqu

object. The sample code is as follows:Let Host:cfhost =cfhostcreatewithname (Kcfallocatordefault, "127.0.0.1"). Takeretainedvalue () Let hostnames: Cfarray =cfhostgetnames (host, nil)!. Takeunretainedvalue ()Welcome to follow Dongsheng Sina Weibo@tony_Dongsheng. Learn about the latest technical articles, books, tutorials and information on the public platform of the smart Jie classroom650) this.width=650; "title=" 00.png "src=" http://s3.51cto.com/wy

Type methods Subscript Content such as nested types can also be extended, and extensions can also comply with protocols.Welcome to follow Dongsheng Sina Weibo@tony_Dongsheng. Learn about the latest technical articles, books, tutorials and information on the public platform of the smart Jie classroom?More ProductsIOS,Cocos, mobile Design course please pay attention to the official website of Chi Jie Classroom:http://www.zhijieketang.comSmart-J

the button.If you call the following parameter-free method:Func OnClick () {}The calling code is as follows:Button.addtarget (Self, Action: "OnClick", êforcontrolevents:uicontrolevents.touchupinside)The difference is that the action parameter "OnClick" method name differs, and the colon of the action parameter method name implies that the method name should have several parameters. If the method to be called is the following 3 parameter forms:Func OnClick (Sender:anyobject, Forevent even

keyword, which indicates that this is a mutation method. call method calculates interest, invokes its instance 10_ 000.00 interest1 call method to calculate interest, we cannot use 10_ 000.00 instance calls, but requires a double interest2 interestby2 is the mutation method that directly alters the variable interest2 interest2.interestby2 () After the statement call is complete, the variable interest2 The value of called InterestBy3 method calculates the interest,

the unpacking, the code is modified as follows:Print (Emp.dept!.comp!.name)However, there is a drawback to the display of unpacking, if a link in the optional chain is Nil , it will cause code run-time errors. We can use a more "gentle" way of quoting, using a question mark (? ) to replace the original exclamation point ( ! ), as shown here:Print (Emp.dept?.comp?.name)Welcome to follow Dongsheng Sina Weibo@tony_Dongsheng. Learn about the latest techn

. Learn about the latest technical articles, books, tutorials and information on the public platform of the smart Jie classroom650) this.width=650; "title=" 00.png "src=" http://s1.51cto.com/wyfs02/M01/7C/BF/wKiom1bXmlyyvPsYAAAs2MBEZnc731.png "alt=" Wkiom1bxmlyyvpsyaaas2mbeznc731.png "/>More ProductsIOS,Cocos, mobile Design course please pay attention to the official website of Chi Jie Classroom:http://www.zhijieketang.comSmart-Jie Classroom Forum Web

type. References type extension ConstructorsExample of defining constructors in an extension class:classperson{ varname:stringvarage: intfuncdescription () ->String{ return "\ (name) Age is: \" } init (Name:string,age:int) { self.name=nameself.age= age}}extensionPerson{ //defines the extension type of the person class convenienceinit (name: string) {//Convenient constructor self.init ( Name:name,nbsP;AGENBSP;:NBSP;8) }}letp1=person ( name: "Mary") //calls the constructor of the two parameter,

want to let the error spread, you can use try! statement. Modify the above code as follows://querying all Data Methods Funcfindall () throws->[Note]{ guardlistData.count>0else{ //throws "no data" error. throwDAOError.NoData} returnlistdata}funcprintnotes () { letdatas=try!findall () ① fornoteindatas{print ("Date:\ (note.date!) -content:\ (note.content!) ") }}printnotes () ② Code printnotes () The function does not declare a throw error and does not need to be called when calling it Try ke

the constructor that calls them. Note: The class is declared as Let constant is still var What about the variables? The class is generally declared as a Let constant from the programming process, because the class is a reference data type, and declaring that a let constant simply means that the reference cannot be modified, but the object that the reference points to can be modified. Welcome to follow Dongsheng Sina Weibo@tony_Dongsheng. Learn abo

Learn Swift from scratch (Day 52)-Cocoa error handling modeThe Swift error handling mode is different in Swift1.x and Swift 2.0. The error handling mode of Swift 1.x Code adopts the Cocoa framework error handling mode. Currently, Objective-C still adopts this mode, while the do-try-catch error processing mode is adopted after Swift2.0. The following sample code reads a string from the file to the memory. If

() Let Hostnames:cfarray = Cfhostgetnames (host, nil)!. Takeunretainedvalue ()Welcome to follow Dongsheng Sina Weibo@tony_Dongsheng. Learn about the latest technical articles, books, tutorials and information on the public platform of the smart Jie classroom?More ProductsIOS,Cocos, mobile Design course please pay attention to the official website of Chi Jie Classroom:http://www.zhijieketang.comSmart-Jie Classroom Forum Website:http://51work6.c

From scratch learn JAVA-3. Store and modify variable information in the program, java-3 variable 1. Create a variable; 2. Use different types of variables; 3. Store values in variables; 4. Use variables in mathematical expressions; 5. Assign the value of a variable to another variable; 6. Increment/decrease the value of the variable. Program Variable: use different types of variables and assign initial valu