nosql

问题 I have a dataset of 60000 items in mysql and i'm trying to insert it into neo4j. The insertion is taking place but it's taking a long time( approx. 10-15 per 3 sec). Is there any way i can speed it up? also is there any way i could give something such as unique key in neo4j so duplication indexes won't get indexed? I'm new to neo4j. I'm using neo4j 1.8 with PHP Everyman driver. 回答1: There is a nice presentation from Max De Marzi, about ETL into Neo4j. See: http://www.slideshare.net/maxdemarzi

问题 I am developing an application and we have decided to implement database with Mongodb, so I'm truly new to it. In database there is a collection for each company and we need to stores the ID(s) of each category of products of the company in a subdocument of company collection, Let's say we need to insert the following Object into collection: { name : "comapnyX" address : { "street" : "main street", "ZipCode" : "12345" }, categories : [ { "name" : "category1" }, { name" : "category2" } ] } An

问题 I am looking for the best way (or at least the right way) to implement a friend system Firebase database in which each user in the database has his own information (his name, profile picture, email, etc.) and a friend list. The problem is that I can't think of a good, efficient way to store the information inside the database, for example, if I store the data in the following way - { "users": { "johnappleseed": { // name, profile picture URL, email, phone, etc... "friends": { "alice": true,

问题 I have a table defined like: Keyspace : CREATE KEYSPACE messages WITH replication = {'class': 'SimpleStrategy', 'replication_factor': '1'} AND durable_writes = true; Table : CREATE TABLE messages.textmessages ( categoryid int, date timestamp, messageid timeuuid, message text, userid int, PRIMARY KEY ((categoryid, date), messageid) ) WITH CLUSTERING ORDER BY (messageid ASC); The goal is to have a wide row time-series storage such that categoryid and date (beginning of day) constitutes my

问题 I need to do "Join" between 2 indexes (tables) and preform a check on specific field on documents that exists in both indexes. I want to add condition like "dateExpiry" below, but I get an error. Is it possible to join 2 or more indexes? GET cache-*/_search { "query": { "bool": { "must_not": [ { "query": { "terms": { "TagId": { "index": "domain_block-2016.06", "type": "cBlock", "id": "57692ef6ae8c50f67e8b45", "path": "TagId", "range" : { "dateExpiry" : { "gte" : "20160705T12:00:00" } } } } }

问题 What are the best solution to preserve left joins in a NoSQL solutions like MongoDB/Norm if you can not modify the complete architecture of one cms. Experiences, Samples, Cost. Thanks. 回答1: I can suggest two ways: Create big documents, i mean combine two, three, ten entites into one. So if you, for example, have reference one to many and you know that 'many' not more than 100 for most cases you can combine these entities into one. Create 'denormalized' documents with data that you need at

问题 Just learning Cloudant NOSQL on Bluemix. I have been successful adding my weather data to the database, simple queries, and even pulling it out to a mobile app using Kinetise. I am not a SW developer,but I am an engineer. I need to access the moment.js date math capability as I believe this will help me sum weather station data over the last 24hours, 7days, and 30d relative to the current moment in time. I though this would be easy not knowing any better. Clearly you need to saddle up when

问题 I am new to Firebase and I am planning to switch from SQLite to Firebase. I have 2 tables in SQLite. First one is NAME OF REPOSITORIES . This will will be general for all users which is accessible to all the users of the application. Second one is BOOKMARKS . This will be specific to a particular user . I know that there is no table structure in Firebase . Question is, how can I structure this type of data in Firebase? I have tried understanding tree structure of Firebase, but didn't get help

问题 I'm new to HBase, what's the best way to retrieve results from a table, row by row? I would like to read the entire data in the table. My table has two column families say col1 and col2. 回答1: From Hbase shell, you can use scan command to list data in table, or get to retrieve a record. Reference here 回答2: I think here is what you need: both through HBase shell and Java API: http://cook.coredump.me/post/19672191046/hbase-client-example However you should understand hbase shell 'scan' is very

问题 Creating Lowdb in Javascript working fine, I have searched in net, couldn't find proper(as per beginner's understanding) solution. creating lowdb using Js const low = require('lowdb') const FileSync = require('lowdb/adapters/FileSync') var customerpath = process.env.APPDATA+'/VEGFRUIT/Customer.json'; const cusadapter1 = new FileSync(customerpath) const db = low(cusadapter1) db.defaults({ customer: [{}]}).write(); how to convert above set of coding into Tyepscript ? 回答1: 1) perform this