Questions tagged [etl]
Extract, Transform, Load - process in a database
53
questions
7
votes
5
answers
376
views
What can I do to get a message processor to slow down the rate of writes that it is making to a database?
We have this architecture:
queue -> message processor (horizontal scaling) -> RDBMS
Sometimes external systems dump 10k messages onto the queue and the message processor of course dutifully ...
- 229
-1
votes
1
answer
190
views
Modeling a CSV file: What is the standard? Python or SQL?
I have a wide CSV file of about 350mb, and want to load it into a SQL database and properly model the data to make it easier to use for analysis.
I could split the data into tables with python and ...
- 111
0
votes
3
answers
221
views
In data engineering, why is data integrity checked on the DW rather than on the data sources?
I'm a software developer and new to data engineering, so this may be a newbie question, but I'm wondering why data integrity checks (for instance, dbt tests) are ran on the data warehouse, rather than ...
- 243
1
vote
1
answer
126
views
Data pipeline design - robust and resilient to future variations
I need to build a data pipeline to populate a database from various files. This is a common scenario. However, I want to have expert opinions for implementing a pipeline that is robust, modular and ...
- 23
0
votes
1
answer
83
views
Better design for a REST import into web store
I have an import that needs to grab data from a REST service and import into an web store. It's basically an ETL type of service, but because the REST service can be slow and I don't want to call it ...
- 119
1
vote
1
answer
449
views
Is microservice approach always best fit for ETL processes?
In our project we are using Django and Django Rest Framework as main application to get/query the data from database and send it to the frontend. Those endpoints are very fast as they should be. ...
- 161
2
votes
2
answers
509
views
Reading a large CSV file and then loading data to a DB
I have a Django application of 2 GB running and I need to receive a CSV file of more than 1 GB, read it and load the data to a PostgreSQL DB in IBM Cloud. The problem is that if I receive the file, it ...
- 29
0
votes
1
answer
74
views
Running ad hoc queries on JSON log files
I have a situation where let's say I have a folder called logs which has N folders.
Each folder contains events for a specific event type and each folder has N .log files where each file has multiple ...
- 1
-1
votes
1
answer
554
views
Agile approach in ETL/ELT development
What are the pros and cons of using agile/iterative approach in ETL/ELT (Extract Transform Load or Extract Load Transform) data warehouses/data lakes/lakehouses systems development?
I often find that ...
- 141
-2
votes
2
answers
405
views
What happens after the ETL process?
I have thousands of .csv files with the same structure and, in most of the cases, some column values are the same ones recurring. Each file represents a report on some structures, with numeric ...
4
votes
2
answers
116
views
Designing an ETL with where there are a few points of entry
I'm trying to think of a scalable solution for my current system.
The current system is
3 microscopes
1 processing machine
1. 60-100GB Files come from 2-3 microscopes every 30 minutes
2. That data ...
- 49
-1
votes
1
answer
33
views
Duplicating API implementations for declaring intention
I'm developing an ETL process in Python and Pandas to pull data from a rest API, and then dump it into a relational database. A few of the fields that come back contain sensitive that I do not want to ...
- 181
1
vote
2
answers
300
views
How to handle manual corrections to data in ETL pipeline
We receive product data from vendors on a regular basis to be incorporated into our catalog. The data looks like this:
[
{
id: 123,
collection: Spring,
name: New Beginnings,
size: 8,
price:...
- 19
0
votes
1
answer
38
views
Is there any general guidelines to allocate table space quota to different layers in ETL?
I am looking for any general guidelines to allocate table space quota to different layers/schemas in ETL flow of a data warehouse (% of total space in each layer).
As per my research, ETL flow can ...
- 33
0
votes
1
answer
268
views
Do Data Warehouse standards allow foreign key constraints at a dimensional model?
Is it true that we never enable foreign key constraints in the dimensional model of a data warehouse? If yes, then what is the rationale behind that?
As per my research:
Some experts told me in a ...
- 33
-3
votes
1
answer
86
views
what is event based data integration? [closed]
Please help me to understand what is event based data integration in simple layman term with some examples?
How it is different from other form of data integration.
Some sample use cases will be ...
-5
votes
1
answer
563
views
Sync local database with remote
My client has a business which work mostly in remote areas where internet felicity is limited, We have a central database and the branches in remote areas need to connect to the central database.
We ...
- 93
4
votes
2
answers
995
views
How should a data warehouse be maintained for a quickly changing schema
I am currently in a process of maintaining a data warehouse for a quickly growing start up company. There is a lot of reporting demands from the clients, and this is usually handled by a data ...
- 151
2
votes
0
answers
42
views
How to manage scheduled ETL jobs that are time sensitive?
We have some ETL jobs that are scheduled to run every day, and some that are scheduled to run every week via Control-M. These types of jobs tag data with the date the job was run and perform filter ...
- 2,333
1
vote
0
answers
822
views
Parsing a JSON file from S3 using Airflow
I'm new to Airflow and I'm working on a proof of concept. The project is fairly simple... every day some 10,000 JSON files are loaded onto a folder on AWS S3. I have to get each one of them, parse ...
- 143
1
vote
1
answer
4k
views
Best practice for sharing code and data between airflow worker nodes?
New to Apache Airflow and curious about how code and data are expected to be used across worker nodes in a multinode airflow setup.
When considering if ETL logic should be in the dags or in separate ...
2
votes
0
answers
393
views
Data pipeline architecture: airflow triggered by message broker
Let us say we have:
a web app with a Postgres DB that produces data over time,
another DB optimized for analytics that we would like to populate over time.
My goal is to build and monitor an ETL ...
- 151
2
votes
2
answers
1k
views
Micro-services architecture for Data Ingestion/Transformation pipeline project
I am working on designing a brand new Data Ingestion Pipeline with the Key highlights of the new project are as follows:
Download and Update data to/from SharePoint using SharePoint APIs
Download and ...
- 121
1
vote
2
answers
81
views
Should data be pre-processed before being handled by an ETL framework?
So I was discussing coding with an associate of mine at work, and was mentioning how I was working on a project where I'd need to transform the data that was provided into a standardized format before ...
- 871
1
vote
1
answer
1k
views
How/when to normalize during ETL?
Let's say you're loading a denormalized flat file of purchase transactions that looks like this:
| location_name | location_zip | product | product_price |
|---------------|--------------|---------|--...
- 11
-1
votes
1
answer
279
views
WebApp for ETL with visual mapping - read csv and map it to data model
a few years ago I wrote a python script for reading CSV, handling the headers, filtering data, renaming stuff via RegEx...bascially to do various ETL stuff.
This was done using a exhaustive ...
- 109
-1
votes
1
answer
152
views
How to incrementally update value of features in a machine learning pipeline?
I am working on a machine learning pipeline where we have to compute certain measures on streaming data. Every day, new raw data enters our pipeline. To update our features, we have to run an ETL that ...
-3
votes
2
answers
700
views
Why are multiple backends in this system? [closed]
I am trying to understand the architecture of the system described in this patent about aggregating and analyzing confidential data:
https://patents.justia.com/patent/20180089196.
The general ...
- 105
0
votes
2
answers
102
views
How to automatically test the result of an ETL tool?
If an ETL tool is being used to move data from an OLTP database into a "business intelligence reporting" database, is there any standard way of automatically testing that the data in the reporting ...
- 113
0
votes
1
answer
354
views
Data Integration Design Using Microsoft SSIS
I am working on a data integration project, where I need to extract data from oracle source and load it to XML file. The requirement is to get the list of customers and foreach customer create an xml ...
- 109