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role for the new user; In the Roles field, you can specify built-in roles and user-defined roles. Roles in role can be selected: Built-in Roles (built-in role): 1. Database user role: Read, readWrite; 2. Database management roles: DbAdmin, Dbowner, Useradmin; 3. Cluster Management role: Clusteradmin, Clustermanager, Clustermonitor, Hostmanager; 4. Backup Restore role: backups, restore;

ALLSelect Id,last_nameFrom S_empwhere ID 3 minus the same parts of the two result sets Select Id,last_nameFrom S_empWhere ID MinusSelect Id,last_nameFrom S_empwhere ID 4 intersect only the same part (intersection) of two result sets Select Id,last_nameFrom S_empWhere ID IntersectSelect Id,last_nameFrom S_empwhere ID Sub-query------------------------------------------------------Query the number of the

valueSecond, complete the main methodTips: 1, call the custom method, save the method return value in the variable maxscore 2, output variable result1 Public classHelloWorld {2 3 //complete the Main method4 Public Static voidMain (string[] args) {5 6 //Create object, object named Hello7HelloWorld Hello =NewHelloWorld ();8 9 //calling a method and saving the return value in a variableTen intMaxscor

Label:Preface: Daughter-in-law asked to be sent up. I want the first page of this article. 1,nuget introduced MongoDB. Then the namespace Using Mongodb.bson; Using Mongodb.driver; Using MongoDB.Driver.Builders; Using MongoDB.Driver.Linq; 2, Global Declaration Mongodatabase MONGO = new Mongoclient (configurationmanager.appsettings["Psconnstrmongodb"]). Getserver (). Getdatabase ("Psnew"); Mongocollection arts = NULL;

extremely fast; the query output speed is extremely fast according to the insertion order; the earliest data can be eliminated when the latest data is inserted. Usage: stores log information, which is best suited for caching a small amount of documents ...... Create: db. createCollection ("my_collection", {capped: true, size: 100000 }) Convert a common set to a fixed set: db. runCommand ({convertTocapped: "test", size: 100000 }) 4. Large file set

Label:Because the project to use MongoDB, today tried to build a bit. First MONGO is still very good, yum or manual download, I am the most recent version of Yum installed 3.0.4. Basically, after the installation is complete, a GUI management tool needs to be installed, and I have tried a lot, all the same. Finally, choose to use Robomongo because this GUI tool has versions on Linux, MAC, and Windows. I install it on CentOS and then modify the/etc/mon

access simple data, without complex operations, you use a file system2. Hierarchical database Database system really started stage, the data is stored in the form of a tree-like structure, so also called the tree database.3. Mesh database data is stored in a form similar to a network structure. Since the 1960s, the first generation database system (hierarchical model database system, network model database system) has come out, they provide

problem Description:input label (does not contain the type= "checkbox" type label) the parent element has a horizontal direction of margin, then the horizontal direction of the margin will be double display.problem code:Workaround:1. Add *display:inline to the direct parent tag of input label;(The above code adds float:left; only to ensure that div in block display, not necessary!) )2. Change the level margin of the parent element to padding, directly avoid IE6,

seconds to kill. By this example, I believe you have a sensory understanding of the index. Three: Unique index As with SQL Server, you can create a unique index, and duplicate key values cannot be inserted naturally, and the use in MongoDB is as follows: Db.person.ensureIndex ({"Name": 1},{"unique": true}). Four: Combined index Sometimes our query is not single-condition, may be multi-conditional, such as looking for the "1989-

Tags: hint applet exe program NET SSL directory soft Win32 detailsGet ready: 1, mongodb-win32-x86_64-2008plus-ssl-3.4.3-signed.msi official download 2, 1, the establishment of data storage directory F:\MongoDB\ 2. Create log file F:\MongoDB\logs # # #安装过程遇到的问题:: Hint DLL file is missing, such as in the title.There are some situations where downloading these DLL

§ 7 straight lines of a Quadratic Surface IDefinition: A surface formed by a set of continuously changing straight lines is calledStraight SurfaceEach line is called its bus. Note: The cylindrical surface and cone surface are both straight surface, but the elliptical surface, dual-blade dual-surface and elliptical parabolic surface are not straight surface. Is the single-leaf dual-surface and hyperbolic parabolic surface a straight line surface? The

indicates normal, 0 indicates exception. PRIMARY indicates the master database 6. view the cluster status in addition. The cluster IP address and other information are displayed. 7. You can view the Master/Slave operation logs of the cluster. Ts indicates the timestamp, op indicates the operation, ns indicates the collection name, and o indicates the data. 8. View operation log information 9. Check the slave Database Synchronization status and s

websites, internal information platforms, and other systems developed based on B/S. Layer-4 Server Load balancer corresponds to other TCP applications, such as C/S-based ERP and other systems. Third, problems to be considered for layer-7 applications. 1: whether it is really necessary. layer-7 applications can indeed improve traffic intelligence. At the same tim