Algorithmic complexity of XML parsers/validators

I need to know how the performance of different XML tools (parsers, validators, XPath expression evaluators, etc) is affected by the size and complexity of the input document. Are there resources...

Storing multiple graphs in Neo4J

I have an application that stores relationship information in a MySQL table (contact_id, other_contact_id, strength, recorded_at). This is fine if all I need to do is show who a contact's...

How to efficiently store and read back a Hierarchy from cache

My situation is that I'm currently storing a hierarchy in a SQL database thats quickly approaching 15000 nodes ( 5000 edges ). This hierarchy is defining my security model based off a users...

What is an efficient way to Merge two iOS Core Data Persistent Stores?

In our app under development we are using Core Data with a sqlite backing store to store our data. The object model for our app is complex. Also, the total amount of data served by our app is too...

Implementing Fast and Efficient Core Data Import on iOS 5

Question: How do I get my child context to see changes persisted on the parent context so that they trigger my NSFetchedResultsController to update the UI? Here's the setup: You've got an app that...

How can I test the type of query Mongoid will generate?

I'm trying to assert, using RSpec, that a given Mongoid query will not load the record, just check for its existence, because the record is big (several MB), and the code needs to only know...

How do I make JSON.NET ignore object relationships?

I'm working on an Entity Framework project. I want to serialize a bunch of entity class instances. I've bound these together into a container class: public class Pseudocontext { public...

Neo4j cache configurations

I have been playing around with heap size for JVM and the file store cache size in Neo4j. It seems like setting the memory mapped buffer to be handled by the OS does not have any effect on the...

Bad performance when inserting nodes in Neo4j with java api

I am trying to insert about 2 million nodes into Neo4j and having trouble with performance. I am using neo4j enterprise 2.2.0 with a server extension written in java. My computer has an ssd, 32gb...

Analyzing multiple Json with Tableau

I'm beginning to use Tableau and I have a project involving multiple website logs stored as JSON. I have one log for each day for about a month, each weighting about 500-600 Mb. Is it possible to...

neo4j database size is very large

I have a graph with the following information: 50,000 Nodes 3,500,000 Relations All nodes have label "music" with the following properties: Name: String (max 6 chars) ID: Integer Played:...

Issue Importing the Paradise Papers Dataset into Neo4j

Hej all, I am having an issue with importing the Paradise Papers dataset into a Neo4j (3.3.2) database. It seems that the data is imported correctly into the database, as reported by neo4j-admin...

Extract subset of data from database based on FKs, and import to another database

Consider a database with 50-100 tables that all can trace all their FK dependencies directly and indirectly (up to 4-5 relationships deep) back to "Table1". In principle, if one record of Table1...

Bootstrap 4 pills clicked content showing below and/or not showing

So the problem is when I click on the last two pills "Activity" and "Impact" and shows the information right below the pill content of "STEMuli" (after clicking STEMuli). But the weird part is...

Merge blob in Azure Search

Is it possible to merge multiple blob into a single Azure Search record? Complete Scenario: We have list of companies stored as json in cosmosDB and its related documents(.docx/pdf) in blob...

Does VirtualBox allocate OS-special "huge pages"?

I'm suffering from heavy performance issues using VirtualBox and VM with lots of RAM, more detailed explained in this and that other question already. From what I've tested so far, there's a...

neo4j-admin import very slow

I am trying neo4j with the yelp challenge data set and one of the aspects i am interested in is the batch import. unfortunately the import takes way to much time then it should and i get a memory...

After neo4j-admin import going Ok I can't see any nodes

I have a neo4j inside a docker container, and i'm trying to import a huge csv into neo4j, as doing it with LOAD CSV is really slow, I've tried this other way that seems to go...

MiNiFi - NiFi Connection Failure: Unknown Host Exception : Able to telnet host from the machine where MiNiFi is running

I am running MiNiFi in a Linux Box (gateway server) which is behind my company's firewall. My NiFi is running on an AWS EC2 cluster (running in standalone mode). I am trying to send data from the...

MiNiFi - NiFi unable to communicate with host:port connection timed out

I am running MiNiFi in a windows server which is behind my company's firewall. My NiFi is running on Hortonworks cluster (3 nodes ex:sj46,sj47,sj48). I am trying to send data from the MiNiFi to...

How to fix "Running out of memory" issue while running power queries in 32 bit ms office 2013

I have a Excel workbook developed in 64 bit ms excel 2016(windows). it has 44 queries/connection. Out of this 40 of them are connections.(there are 6 main tables users will update their values in...

Can Haskell model models?

Can haskell correctly model models? I'm have very little experience with Haskell. I have never seen a common imperative oop based programming language that can use models. For those uninitiated, a...

Options for storing binary data of size 100 MB to 1 GB

If I am planning to store binary data of size varying from 100 MB to 1 GB what is a better option Relational data (this I am assuming would be a direct no) NoSQL DB File system Also do suggest...

Way to filter multiple conditions in Power Query from folder containing CSV files

I need a help from you with correction/suggestion of query I am using to get a data from folder in CSV format. Warning upfront: I don't know, how to write this shortly. Few informations...

Failing in MiNiFi-Tutorial, toolkit error: Connection with id ... has invalid destination id

I followed this tutorial: Getting started with MiNiFi Therefore, there is a input port in my root process group and a process group for MiNiFi. The MiNiFi Process Group, contains a Tail File...

Seek function of HTML5 video and Maximum Keyframe Interval in video encoding compression

This is a very specific question about how the seek function (of an HTML5 video element) interprets a video, in this case one in WEBM format and what specific relationship it has with the Maximum...

Two Way Embedding vs. One Way Embedding in MongoDB (Many-To-Many)

I would like to discuss with you, if it makes any sense to use two way embedding instead of one way embedding, when modeling an N:M relationship in MongoDB. Let's say, we have two entities: A...

NiFi: poor performance of ConsumeKafkaRecord_2_0 and ConsumeKafka_2_0

I'm trying to load messages from relatively large topic (billion+ records, more then 100 GiB, single partition) using Apache NiFi (nifi-1.11.4-RC1, OpenJDK 8, RHEL7), but performance seems to be...

Bigquery Storage API Multiprocessing segfault

Long time reader, first time poster. I'm working with the BigQuery Storage API Python client library, and I'm running into some trouble splitting out my readers using Python multiprocessing. There...

Parallel Computing - Cointegration

I am trying to find cointegrating pairs in the S&P 500. I have the daily price data. Previously I used a "for" loop to check for cointegrating pairs and it worked. But it took about 1500 seconds,...