mongodb migrate data

Tags: mongodbMongoDB Data Model and Index learning Summary 1. MongoDB Data Model: MongoDB Data storage structure:MongoDB uses Bson (binary JSON, binary encoded) data format to store and exchange

about MongoDB MongoDB is a database based on distributed file storage. Written by the C + + language. Designed to provide scalable, high-performance data storage solutions for WEB applications. MongoDB is a product between a relational database and a non-relational database, and is the most versatile and most like rel

()) { return false; } $value= $store ['value']; return true; } return false; }//End Function Publicfunction Store ($key, $value, $ttl =0) {$store ['value'] =$value; $store ['Dateline'] =Time (); $store ['TTL'] =$ttl; $store ['Key'] = $ This-Create_key ($key); $store ['prefix'] = $ This-prefix; $res= $ This->mongodb->update (Array ('Key'= = $store ['Key']), $store, Array ("Upsert"=true)); return$res; }//End Function Publi

I. Software environment (version not required) PHP v5.6 extension: MongoDB nginx v1.11 MongoDB v3.2Note: MongoDB extensions must be installedIi. Connection $client = new Mongoclient ($server, $option);$server variable is a string that describes the server to which you want to connectMongodb://[username:[email protected]]host1[:p ort1][,host2[:p ort2:],...] /dbIt

Tags: manual pos Blog Different Understanding MongoDB technology share AST PrimaryObjectivePersonal understanding, a primary function of a replica set is when the master library fails, and one of the salve from the library is elected to become the new master. The frame diagram is as follows:Among them, the electors do not participate in the data storage, its role is only to elect a new master. When the orig

Tags: update section prevents DBF upd Objectid code set PreBy default, update updates the first found data, and we do an experiment by inserting 3 C-1 data.Db.test_collection.insert ({c:1})And then we'll find a bit.Db.test_collection.find ({c:1})The result is{"_id": ObjectId ("5b5e3f7da2b4848fd8c49dbf"), "C": 1"_id": ObjectId ("5b5e3f7fa2b4848fd8c49dc0"), "C": 1 "_id": ObjectId ("5B5E3F7FA2B4848FD8C49DC1"), "C": 1}The instructions have been inserted

The performance test of MONGODB billion data volume was carried out, and the following items were tested:(All inserts are single-threaded and all reads are multithreaded)1) Normal insertion performance (the inserted data is about 1KB per piece)2) Bulk Insert performance (using the official C # client's Insertbatch), which is measured by how much the bulk insert p

Tags: MongoDB database nosql Data ModelingThe data in MongoDB is very flexible, and the collection does not force the document to adopt a uniform structure. But it is still important to consider the data model seriously, as it affects the performance of the application and t

($v 3); $product [$k 1][$k 2][$k 3] = $v 3; }} if (Is_time ($v 3)) {$product [$k 1][$k 2][$k 3] = new \mongodate (Strtotime ($v 3)); }}else{foreach ($v 3 as $k 4=> $v 4) {if (!is_array ($v 4) !is_object ($v 4)) { if (In_array ($k 4, $productfloat)) {if (Is_numeric ($v 4)) {$v 4 = floatval ($v 4); $product [$k 1][$k 2][$k 3][$k 4] = $v 4; }} if (Is_time ($v 4)) {$product [$k 1][$k 2][$k 3][$k 4] = new \mongodate (Strtotime ($v 4))

Tags: mongodb Big Data operation and maintenance managementDatabase ManagementBack up the MongoDB serverExecute Mongodump//Use local connection 127 and port to connect local database by defaultThe database reverts to the state before the backup:Mongorestore--dropThe ##--drop option tells the Mongorestore tool to discard existing

style.2 exporting files in CSV format/test/mongodb/bin/mongoexport-d wxdata-c apachelog--csv-f host,time,method-o apachelog_csv.datConnected to:127.0.0.1Exported 2 recordsCat Apachelog_csv.datHost,time,method"66.249.69.194", "12/jun/2014:12:57:59", "GET"Parameter description:--csv means to export to CSV format-F indicates which examples need to be exportedMore detailed usage can be mongoexport–help to seeData import Mongoimport1 Importing JSON dataWe

I see the state of the query here is 0, the previous data of the state is not 1, the solution is to repair the data.Db.repairdatabase ()As for the reasons for inconsistent data, I am not very clear, after a variety of information queryMay be in the program, the linked database is not operating in Safe mode databaseThe following is a database of linked database operations in Safe modeMongoclient client = new

In this example, we use the official C # Driver to store and query spatial data (vectors) in MongoDB) read vector element space information and attribute tables, and write them to MongoDB. Read the shapefile file and convert the space information to json using the Ogr library. [csh In this example, we use the official C # Driver to store and query spatial

Label:monmatchledcheck cause Fault alsconfig data type Data type MongoDB 3.x data capacity GB Failure type Server power loss causes WIREDTIGER.WT file corruption Start error detected data files in E:\DTLFolder\MongoDB\

MongoDB Collections (collection) can be viewed as tables of relational databases, and document objects (documents) can be viewed as a record of relational databases. But the two are not exactly equal. The structure of the table is fixed, the MongoDB set does not have this constraint, and the document object that is stored in the collection can even embed the subdocument, or "child collections". They can eve

I. Issues　1.SPRING-DATA-MONGODB User name Password login error problem: Failed to authenticate to databaseOrg. springframework. Data. MongoDB. Cannotgetmongodbconnectionexception:failed to authenticate to database [AShop], username = [AShop], password = [g******** ***4]org. springframework.

Start MongoDB: sudo service mongodb start ,mongo After testing, the key can be quoted or not added, but the value is generally quoted, except for the value type MongoDB is case-sensitive, and naming is usually based on the camel-named method MongoDB will be created automatically if the database/collect

In MongoDB (version 3.2.9), the distribution of data refers to splitting the collection data into chunks (chunk) and distributing them on different shards (shard). There are 2 main ways to distribute data: Balanced distribution based on the number of blocks (chunk) and directed distribution based on the Slice key range

Backing up and recovering data is important for managing any data storage system.1, cold backup and recovery-Create a copy of the data file (if you want to stop the MongoDB server), that is, the direct copyMongoDB stores all the data in the

Mongodb database backup and recovery in windowsI can talk about data backup to the c: \ data \ dump directory, first create this path. Go to the bin directory of mongodb.Mine is:C: \ Program Files \ mongodb \ binThe backup script is:// BackupExport dump-h 127.0.0.1: 27017-d test-o c: \