Shadowing Practice: Database vs Data Warehouse vs Data Lake | What is the Difference? - Learn English Speaking with Video
Les maken...
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What's going on, everybody?
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Welcome back to another video.
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Today, we're going to be taking a look at the differences between a database, a data warehouse, and a data lake.
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Now, when I was first starting out, I'd only ever heard of a database.
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And I think that's what most people are familiar with.
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But I had never heard of a data warehouse or a data lake.
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And so in this video, we're going to be walking through the differences between each one of them, as well as how they kind of connect with one another.
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So let's jump onto my screen and get started.
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All right, so we're going to be taking a look at a database, a data warehouse, and a data lake, but let's start with a database.
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Now, when someone says a database, typically they're referring to a relational database.
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Now, a relational database can capture and store data via an OLTP process, which stands for online transactional process.
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So when a company completes a transaction and sells an item, it'll record that within a database.
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And that data has the ability to be live real-time data.
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Data in a database is going to be stored in tables, which has columns and rows, and it's gonna be highly detailed, which means you're gonna be able to go in and see every single aspect of the data.
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And databases also have a really flexible schema, which means you can go in there
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and kind of change things as you go to make it work for what you need.
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Now, a data warehouse is also a database, just like we were looking at before, but it's gonna be used for analytical processing or OLAP.
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OLAP.
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OLAP stands for online analytical processing.
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It's created to basically analyze huge amounts of data.
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Now, if you notice on the last slide, there were these three databases and they were just kind of sitting there and they were storing the data.
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In this visualization that we have on the right, these three databases on the bottom are all aggregating and sending their data to this data warehouse via an ETL process,
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which is where it extracts the data, it transforms it and loads it exactly how they need it in this data warehouse.
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And that's how data is put into the data warehouse.
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It isn't getting it directly from the source, but it's being put into a database and via the ETL process
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is being updated as it goes or whenever the ETL process runs.
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A data warehouse will always have the historical data, but it won't always have the current data unless the ETL process is running every single day or very frequently.
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The data in the data warehouse is also a little bit different
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because we're doing this ETL process to get the data in there.
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We're not actually putting every single piece of data or every column and row in there.
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We're typically summarizing it and then putting it in there, which will allow us to process that data for our analytical purposes much faster.
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Now, a data warehouse is going to have a much more rigid schema, so you really need to plan ahead with how you're going to put your data into a data warehouse.
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It's not as flexible as just a database.
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So now let's look at some of the key differences between a database and a data warehouse.
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A database is going to be used for recording transactions, where a data warehouse is going to be used for analytics and reporting.
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A database is going to have fresh and detailed data, where a data warehouse is going to have summarized data.
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It's only going to be as fresh as the ETL process is created.
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A database is going to be a little bit slower for querying large amounts of data.
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And when you do query large amounts of data, it can actually slow down the processing of all those transactions.
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A data warehouse was designed for the exact opposite.
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It It was designed to be very fast at querying
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and not slow down any processes because it isn't part of that transaction processing at all.
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So now that we've looked at a database and a data warehouse, let's take a look at a data lake.
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A data lake was basically designed to capture any type of data that you could possibly want.
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It could be a video, a picture, an image, a document, a graph, anything you could imagine that you'd want to put in a database or store in some way,
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you can store it in a data lake.
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Now, there are a ton of use cases for a data lake, but I think people who work with machine learning and AI get to use it or benefit from it the most.
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They can use all that structured and unstructured data and create models to really use it in its raw form, where if you want to use it for analytical purposes, typically you're going to have to clean it up a little bit
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and do a little bit more work to actually make it usable.
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And so a data lake is just that.
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It's this lake where you can basically throw any type of data in there, but it's not always super usable because you're just putting it in there and it's raw form.
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If you want to use it for analytical purposes and reporting, most of the time, you're gonna wanna clean that up and put it into a database or a data warehouse.
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So now when we're looking at all three, they are all different and they're all used for different purposes.
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So no one option is better than another for your data.
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If you're using it just to record transactions, a database is what you should do.
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And if you have a large amount of data, that's just too much for your database to handle, Sounds like you might need a data warehouse.
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And if you have all this data, you have no idea what to do with, or it's unstructured, it's semi-structured data that you can't fit into a database, well, then I highly recommend using a data lake.
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There really is no one size fits all.
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All three of these can be options for different uses.
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And in fact, you can use all three within one company for just different things that your company needs.
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So I hope that that was helpful, learning the differences between a database, a data warehouse, and a data lake.
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Again, I had really never used a data warehouse or a data lake when I first got into analytics.
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But now that I've gotten hands-on experience with all of them, they're all really interesting, can be used for so many different things.
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So thank you so much for watching this video.
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I really appreciate it.
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If you liked this video, put your like and subscribe below, and I'll see you in the next video.
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Woordenschat en spreektips bij deze les
Deze spreekles op niveau C1 is gebaseerd op de video “Database vs Data Warehouse vs Data Lake”. Deze woorden komen het vaakst terug: database, warehouse, lake, process, Etl. Deze video bevat 66 zinnen en 1174 woorden om na te spreken. Het gesproken deel duurt 5:10. De spreker praat snel, ongeveer 228 woorden per minuut, dus reken op verbonden en ingeslikte klanken. 83% van de woorden hoort bij de 3.000 meest gebruikte Engelse woorden; de rest kun je beter vooraf bekijken.
Belangrijke woorden in deze video
De 11 moeilijkste woorden uit de video, met uitspraak en betekenis:
| Woord | Uitspraak | Betekenis |
|---|---|---|
| warehouse zelfstandig naamwoord | /ˈwɛə(ɹ)haʊs/ | pakhuis, opslagplaats |
| query zelfstandig naamwoord | /ˈkwɪɹ.i/ | vraag, verzoek |
| summarize werkwoord | /ˈsʌməˌɹaɪz/ | samenvatten, opsommen |
| usable bijvoeglijk naamwoord | /ˈjuː.zə.bəl/ | bruikbaar |
| visualization zelfstandig naamwoord | /ˌvɪʒ.ʊ.ə.laɪˈzeɪ.ʃən/ | visualisatie |
| rigid bijvoeglijk naamwoord | /ˈɹɪd͡ʒ.ɪd/ | stijf, stroef |
| analyze werkwoord | /ˈæn.əˌlaɪz/ | analyseren |
| aggregate zelfstandig naamwoord | /ˈæɡ.ɹɪ.ɡət/ | geheel, samenstel |
| subscribe werkwoord | /səbˈskɹaɪb/ | abonneren |
| extract zelfstandig naamwoord | /ˈɛkstɹækt/ | fragment |
| graph zelfstandig naamwoord | /ɡɹæf/ | grafiek |
Phrasal verbs die je zult horen
| Woord | Betekenis |
|---|---|
| slow down werkwoord | afremmen |
Grammatica in deze video
De structuren die de spreker het meest gebruikt, met de exacte woorden uit de video:
| Structuur | In de video |
|---|---|
| Lijdende vorm be + voltooid deelwoord — het gaat om wat er gebeurt, niet om wie het doet | be stored · is put · being put |
| Betrekkelijke bijzinnen who / which + zin — extra informatie over een persoon of ding | tables, which has · schema, which means · there, which will |
| Present perfect have/has + voltooid deelwoord — iets uit het verleden dat nu nog telt | we've looked · I've gotten |
Uitspraak om op te letten
De spreker gebruikt 31 samentrekkingen en verkorte vormen, zoals we're, you're, gonna. Spreek ze kort uit, zoals je ze hoort.
- De klanken “sh” en “zh”: transactional /trænˈzækʃ(ə)nəl/, visualization /ˌvɪʒ.ʊ.ə.laɪˈzeɪ.ʃən/
- Lange woorden — let op de klemtoon: analytical /ˌæn.əˈlɪt.ɪ.kəl/, analytics /ˌæn.əˈlɪt.ɪks/, transactional /trænˈzækʃ(ə)nəl/, visualization /ˌvɪʒ.ʊ.ə.laɪˈzeɪ.ʃən/
Klanken die Nederlandstaligen lastig vinden:
- Stemhebbende eindmedeklinker — /b/, /d/, /g/, /z/, /v/ niet verscherpen: summarize /ˈsʌməˌɹaɪz/, rigid /ˈɹɪd͡ʒ.ɪd/, analyze /ˈæn.əˌlaɪz/, columns /ˈkɑləmz/, subscribe /səbˈskɹaɪb/
- /æ/ — opener dan de Nederlandse “e”: analytical /ˌæn.əˈlɪt.ɪ.kəl/, analytics /ˌæn.əˈlɪt.ɪks/, transactional /trænˈzækʃ(ə)nəl/, analyze /ˈæn.əˌlaɪz/, aggregate /ˈæɡ.ɹɪ.ɡət/
- /g/ — een harde plofklank, geen Nederlandse “g”: aggregate /ˈæɡ.ɹɪ.ɡət/, graph /ɡɹæf/
Zo oefen je met deze video
- Luister de hele video één keer zonder te spreken en noteer de woorden die je niet kent.
- Begin op 0,75× snelheid, spreek zin voor zin na en ga terug naar normale snelheid zodra het makkelijk gaat.
- Neem jezelf op en vergelijk met het origineel; let daarbij op woorden als warehouse, query, summarize.
Wat is de Shadowing-techniek?
Shadowing is een wetenschappelijk onderbouwde taalleermethode die oorspronkelijk is ontwikkeld voor professionele tolkentraining en gepopulariseerd door polyglot Dr. Alexander Arguelles. De methode is eenvoudig maar krachtig: je luistert naar native Engelse audio en herhaalt het onmiddellijk hardop — als een schaduw die de spreker volgt met slechts 1–2 seconden vertraging. In tegenstelling tot passief luisteren of grammaticadrills, dwingt shadowing je hersenen en mondspieren om echte spraakpatronen tegelijkertijd te verwerken en te reproduceren. Onderzoek toont aan dat het de uitspraaknauwkeurigheid, intonatie, ritme, verbonden spraak, luisterbegrip en spreekvaardigheid aanzienlijk verbetert — waardoor het een van de meest effectieve methoden is voor IELTS Speaking-voorbereiding en echte Engelse communicatie.