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database backups. Execute the command, and the result example is as follows: Copy Code code as follows: Db.runcommand ({fsync:1,lock:1}) {"ErrMsg": "Access denied; Use admin db "," OK ": 0} Use admin > Db.runcommand ({fsync:1,lock:1}) { "Info": "Now locked against writes, use Db.fsyncunlock () to unlock", "Seealso": "Http://www.mongodb.org/display/DOCS/fsync+Command", "OK": 1 } 5. View current lock status Copy Code code as follows:

There are many ways to install MongoDB, you can install the source code, and you can use the Yum source installation method in CentOS. Since MongoDB is updated more quickly, I prefer to use the Yum source installation method. The installation steps under 64-bit CentOS are as follows:1. Preparatory work Run the Yum command to view MongoDB package informa

I will talk about the replica set in the previous phase. The primary features of the replica set are embodied in two aspects: 1. the replica set does not have a specific primary database. 2. If there is a fault such as a crash, the cluster selects a database as the primary database, which provides the automatic fault recovery function. Next we will perform the following operations: in the folder, copy mongodb1_db2 I will talk about the replica set in

Directory 1. Introduction 2. 3.MongoDB installation Process Use of 4.MongoDB 5.MongoDB Add Administrator account 6.RoboMongo installation Process 7.RoboMongo Management Database 8. Summary 1 Introduction Mongo DB is a non-relational database (NOSQL) that is currently very po

. #notablescan = True # Close data file pre-allocation # Disable data File preallocation. #noprealloc = True # Specify the size of the. ns file for the new database, in MB # specify. ns file size for new databases. # nssize = # Accout token for Mongo monitoring server. #mms-token = # MONGO the name of the monitoring server # server name for Mongo monitoring server. #mms-name = # MONGO The ping interval of the monitoring server # Ping interval for

!" "}Return Json.dumps (res, ensure_ascii=false)Server.run (port=8989,debug=true) #启动服务, this need to note that after starting the service if the modified script to run a direct restart, you can not click the right button again to run, otherwise the interface conflict will be reported, because the original running service does not stop5 modifying ExcelImport xlrdFrom xlutils import Copy #修改excel需要导入该模块Book1 = Xlrd.open_workbook (' Ex.xls ') #1, open the original ExcelNew_book = Copy.copy (Book1)

The cate_no value is 6, 2, 9, 13, 19, WHEREcate_noin (6, 7, 8) member nbsp; a field in the table named cate_no is of the string type. When the cate_no nbsp; value is nbsp; 6, 2, 9, 13, 19 nbsp; (the numerical order is out of order ). SELECT nbsp; * nbsp; FROM nbsp; th

(1, num_num + 1)Print "BEFORE:", fac_list I = 0 While I If num_num % fac_list [I] = 0: # Check whether the input number can be divisible by an element in the list.Del fac_list [I]I = I + 1 Print "AFTER:", fac_list[Execution result]Enter a number: 12BEFORE: [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]AFTER: [2, 4, 5, 7, 8, 9, 10, 11]

Mongodb provides an interesting "Multi-key" feature that automatically indexes the array values of objects. Tags are a good example. Suppose you have an article that contains many classification tags: $ dbshell> db.articles.save( { name: "Warm Weather", author: "Steve",tags: ['weather', 'hot', 'record', 'april'] } )> db.articles.find(){"name" : "Warm Weather" , "author" : "Steve" ,"tags" : ["weather","hot","record","april"] ,"_id" : "497ce4051ca9ca6d3

The sum of factorialEnter N, calculate s=1! +2! +3! + ... +n! The last 6 bits (excluding the leading 0). N≤10 6, n! SaidThe product of the first n positive integers.Sample input:10Sample output:Package Demo;import Java.util.scanner;public class Demo02 {public static void main (string[] args) {Scanner in=new Scanner ( system.in); int n=in.nextint (); Long sum=0;fo