sharding

问题 Hi I'm using C# with MongoDB Official driver v2.2.4 and I want to run db.runCommand() on the admin database. So far i have this and i am able to connect to the admin database but db.runCommand is giving me this error "An unhandled exception of type 'System.FormatException' occurred in MongoDB.Bson.dll Additional information: JSON reader was expecting a value but found 'db'." MongoClient client = new MongoClient(); database = client.GetDatabase("admin"); var collection = database.GetCollection

问题 In a sharded MongoDB configuration, is it recommended to run the mongos and config servers on the same machines? I would end up with 3 mongos and 3 config servers, achieving full redundancy with much less costs. 来源： https://stackoverflow.com/questions/20736801/should-i-run-mongodb-config-and-mongos-on-the-same-servers

问题 When creating a new Azure IOT Hub you are asked how many device-to-cloud partitions you need. You can select between 2-32 partitions for standard tiers. I understand that the SKU and number of units determine the maximum daily quota of messages that you can send to IOT Hub. And that it is recommended to shard your devices into multiple IOT hubs to smooth traffic bursts. However, device-to-cloud partitions need clarification. 1>> What is the purpose of those device-to-cloud partitions under a

问题 I am currently exploring solutions in order to archive and provide a web search engine for enormous documentation data. I have firstly started my search looking for search engine solution and I end up with the conclusion that Elasticsearch was one of the best one when you have to deal with huge amount of data. I have read that it scale easily and out of the box and i was convinced. Then I looked about No SQL database and because of the number of actors, i spent more time on my searching and I

问题 I'm trying a simple Hibernate shard example (Yes, odd, 3.0.0.Beta2 released 4 years ago) using Hibernate Core 4.1.7 and Spring 3.1.2 and hit this issue during session factory initialization: Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mySessionFactory' defined in class path resource [shardedspring-config.xml]: Instantiation of bean failed; nested exception is org.springframework.beans.factory.BeanDefinitionStoreException: Factory method

问题 I want to use sharding in arangoDB.I have made coordinators, DBServers as mentioned in documentation 2.8.5. But still can someone still explain it in details and also how can I able to check the performance of my query after and before sharding. 回答1: Testing your application can be done with a local cluster, were all instances run on one machine - which is what you already did, if I get that correctly? An ArangoDB cluster consists of coordinator and dbserver nodes. Coordinators don't have own

问题 I'm trying the MongoDB's shard tutorial, for some simple testing (proof-of-concept project). I want to try sharding on a single machine. Is this possible and/or does it make any sense? When I follow the guide steps, it does not work. First, I start the mongod configsrv database instances on my machine: bin/mongod --configsvr --dbpath $BASEDIR/data/configdb --port 27019 & bin/mongod --configsvr --dbpath $BASEDIR/data/configdb1 --port 27020 & bin/mongod --configsvr --dbpath $BASEDIR/data

问题 Instagram's Postgres method of implementing custom Ids for Sharding is great, but I need the implementation in MySQL. So, I converted the method found at the bottom of this blog, here: http://instagram-engineering.tumblr.com/post/10853187575/sharding-ids-at-instagram MySQL Version: CREATE TRIGGER shard_insert BEFORE INSERT ON tablename FOR EACH ROW BEGIN DECLARE seq_id BIGINT; DECLARE now_millis BIGINT; DECLARE our_epoch BIGINT DEFAULT 1314220021721; DECLARE shard_id INT DEFAULT 1; SET now

问题 I have heard the 'shard' technique mentioned several times with regard to solving scaling problems for large websites. What is this 'shard' technique and why is it so good? 回答1: Karl Seguin has a good blog post about sharding. From the post: Sharding is the separation of your data across multiple servers. How you separate your data is up to you, but generally it’s done on some fundamental identifier. 回答2: In brief, imagine seperating your users_tbl across several servers. So Users 1-5000 and

问题 I'm researching how to resolve a situation where a client needs all data for a particular customer (and only the data for that customer) to be stored on a geographically disparate database server. For example, all data should be stored in database servers on the main cloud, except for all data relating to customer ID 92, which should be stored in servers on a different cloud in another location. There are a couple of constraints I am working with that are making this a little tricky, but so