How does a database handle pagination?

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What is it and Why make it? Xline is a distributed KV storage for data management on Curp protocol. Existing distributed KV storage mostly uses the Raft consensus protocol, which requires two round-trip times (RTTs) to complete a request. When deployed in a single data center, the latency between nodes is low and therefore does not have a large impact on performance.However, when deployed across data centers, the latency between nodes can be tens or hundreds of milliseconds, at which point the Raft protocol will become a performance bottleneck. The Curp protocol is designed to solve this problem. It can reduce one RTT without conflicting commands, thus improving performance. Xline aims to achieve high-performance data access and strong consistency across data center scenarios. How can it be used as a key-value store for metadata management? This project aims to realize a multi-datacenter metadata management solution with high performance and strong data consistency, which is critical for businesses with geo-distributed and multi-active deployment requirements. Xline makes it possible to manage metadata, such as indexes, permissions, and configurations across multiple clusters. It provides a KV interface, and multi-version concurrency control, and is compatible with ETCD. What's new? The major change in this release is about the introduction of a persistence layer. The improvements in this new version include the following: Features: Implement a persistent storage layer to enable durability, including: Implement a storage engine layer to abstract the concrete storage engine, like rocksdb , and enable upper layer storage function (#185, #187) Enable recover logic for curp and xline (#194, #184) Fix Bugs: Fix concurrent cmd order bug (#197) Since storage was previously done in memory, if the process crashes, data recovery will take a long time. Thus, Xline now introduces a persistence layer that stores data on disk. We received a question concerning whether the performance test based on memory is convincing. After careful consideration, we decided to do a benchmark on this basis, and the results are expected to be released in v0.3.1. Want to contribute? There are currently some tasks that do not require an in-depth understanding of Curp protocol or this project, but only the APIs and Rust languages. It is friendly for those who want to get started and use Rust in an open-source database project. Welcome to contribute to Xline, and the community will provide guidance and assistance for sure Relevant Links： GitHub: https://github.com/datenlord/Xline Paper of Curp :https://www.usenix.org/system/files/nsdi19-park.pdf Article of Curp: https://medium.com/@datenlord/curp-revisit-the-consensus-protocol-384464be1600 Xline Website：www.xline.cloud submitted by /u/withywhy [link] [comments]

Hello everyone, I am currently enrolled in a Database Management Systems course at my university, and there is a group project. There are no guidelines from the prof or the TAs on how to implement the project - We have only been learning theory in class. My group members and I are very new to anything related to databases and have no idea how to set up a SQL server we can all work on (or how to start implementation, honestly). Any tips on what we should do to get the project going would be great. Thank you. submitted by /u/Federal_Carry [link] [comments]

I’m working on an article with a tentative title of “Tales of the Crypt: Horror stories where database performance caused a real problem.” It’s meant to be schadenfreude nostalgia, about your late nights coping with a performance issue (with, hopefully, a happy ending of “…and this is what we did to fix it”). So, what happened? Tell me about it. (And you know everyone here wants to hear the story too.) I want to quote you, but we can be oblique about the attribution – especially because sometimes these stories are from a previous employer and do not represent any current affiliation. But I do want the verisimilitude that demonstrates that these tales-of-woe come from real people. As a result, I’m fine with writing, “Kim’s first job was as a mainframe programmer at a hotel chain, where database transactions required tape changes. ‘Yada yada story,’ says Kim, who now is CIO of a Midwest insurance firm.” Real person, but you don’t need to worry about getting anyone to approve your words. (Though if you’re happy with full name, company, and role, I’m even happier; send in a private message if you prefer.) I used an ancient example above, but I’m hoping for more recent database performance stories. Ideally some of the “here’s how we fixed it” become practical suggestions for developers who are enduring such a situation today. submitted by /u/yourbasicgeek [link] [comments]

What skills do i need to learn if i want to be a database administrator right after college? submitted by /u/Initial-Routine4506 [link] [comments]

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Hi, wondering if someone might help me out. I need someone to do for me, or provide a method / script to query a public database, and construct a visual for making a strategic decision. https://opengovca.com/alberta-child-care I need someone to plot the addresses on a map, along with a pin with the "Capacity" field. Filtering negatives out based on 'Accreditation Status' would be good too. If there is a way to pull ALL the information, and work with it in a recommended software, that would be great as well. TY all in advance! submitted by /u/pyro6314 [link] [comments]

Is there a scalable to way to diagram SQL models instead of ERD? I’m not sure why ERDs are still used as they become highly unreadable and unmaintable even just over 10 tables. Is there a more scalable diagramming method? submitted by /u/throwawaymangayo [link] [comments]

Hello, I hope this is the right place to ask this. I work for a small-ish business with a few dozen locations. Currently, we use Goog Sheets (ugh) to track everything; maintenance, property manager contacts, utilities, ISP, etc. This is chaos. Is there a database system out there where I can track this in one place? Ideally, I would love to be able to type the site code and see all of the info for that location, or, for example, look up all utilities and see those on one screen. Does something like this exist? Is this unreasonable to look for? Thank you submitted by /u/mara_sage [link] [comments]

I am working on a new Java/Spring code base where I have sometime like person { OneTomany Set<Job> jobs; } job { String personId } in db, job has a FK person_id which is the id of the person in the Person table. Now whenever they are deleting all the jobs for a particular person, they are doing something like this Set<Jobs> jobs = jobRepository.findAllByPersonId(String personId); jobRepository.deleteAll(jobs) //and then they do following in the same method Person person = personRepository.findById(personId); personRepository.save(person); Questions: Why do they need to call save on the person entity? Note that there are no annotations on this method such as Transaction annotation or anything. I am not sure if they need to call save on person entity but they have don it at every single place which makes me wonder if I am missing anything? submitted by /u/ForeignCabinet2916 [link] [comments]

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I am a 1.5 years exp Software developer and wnated some good courses or resources to learn DB scalability , patterns , query optimisations , indexing and more. Thanks 👍 submitted by /u/RishiRed [link] [comments]

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I have 2T of music and karaoke that needs to be de-duped and the file names of the karaoke “normalized”. I tried doing string functions in excel and reached a dead end. There’s an online songbook format I want to use, so that’s the end product. Last time I sent a link to the spreadsheet it crushed the person’s PC. Anyone wanna give it a try? submitted by /u/davidxwolfe [link] [comments]

I'm developing a library (ORM for node.js TS) and looking for a way to allow users to switch databases in the documentation. So if the user chooses Postgres, docs will show pages with Postgres-specific features, and specific column types. If the user chooses another db, it still shows common features but can show a different set of column types and different db-specific features. I'm looking for an example of if it's already done in some other library or tool, to maybe took inspiration from. But the libraries I know either specialize on a single db, or tries to give you a generic interface as if there is no big difference between dbs, or they support multiple documents for different dbs even though most of the content stays the same. So if you know such docs with switching (any programming language, any tool) please share. submitted by /u/romeeres [link] [comments]

Please let me know which application can be used to do SQL / database related projects which allows to import excel. Also i need suggestions for online free websites where I can import large excel and do projects without installing applications submitted by /u/Po81998 [link] [comments]

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Let me explain the table definition first ​ CREATE TABLE IF NOT EXISTS `words` ( `id` INT UNSIGNED NOT NULL AUTO_INCREMENT, `word` VARCHAR(255), `word_data` JSON NULL, `created_at` DATETIME NULL, `updated_at` DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP, PRIMARY KEY `pk_id`(`id`), CONSTRAINT words_word_unique UNIQUE (word) ) ENGINE = InnoDB; ​ Basically it should prevent the duplicate value on the word column. ​ And the query I am running to insert into the table "Insert ignore into words(word,created_at) values(?,now());" ​ Now, the problem is there is duplicate word after I insert 252 rows successfully. So, when the query goes to the following unique word, instead of making a new row at id 253; it starts at id 254. ​ The console output at that point: last inserted id 251 rows affected 1 last inserted id 252 rows affected 1 last inserted id 0 rows affected 0 last inserted id 254 rows affected 1 last inserted id 255 rows affected 1 I have also tried with the query "Insert into words(word,created_at) values(?,now()) on duplicate update updated_at=now(); " It also gives the same result. So, what I am doing wrong? I tried to find the reason on the internet, but could not. Hence I am posting it here. I am using SqlX golang package for query execution. submitted by /u/xatta_trone [link] [comments]

Databend has recently introduced an SQL function that generates SQL statements from natural language. This function may be able to reduce the time required for writing and debugging SQL statements. https://databend.rs/doc/sql-functions/ai-functions/ai-to-sql submitted by /u/PsiACE [link] [comments]

YTsaurus: Exabyte-Scale Storage and Processing System Is Now Open Source The part about MapReduce stuck out to me: "Despite the fact that MapReduce technology is no longer considered new and unusual, its implementation in our system is worth some attention. We still use it for computations on petabytes of data where high throughput is required." High throughput computations. Anyone use this or MapReduce? What are your thoughts? submitted by /u/goldoildata [link] [comments]

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Hello, I'm creating a logging solution, recording a specific event with MongoDB. To help visualize the problem, I've created a library analogy. Where we have Libraries, Visitors, and Visits that need to be logged. Here is an image to help visualize the crossroads that I'm at. Basically, the 'logging' that's going to be happening will happen more than 1 million times a day (est 13,000 'libraries' with average 75 'visitors'). Data will primarily be fetched from the POV of 'libraries' at early stages but also has needs of being viewed from a 'global' viewpoint at later stages. There will never be a time when one library is authorized to see any SPECIFIC interactions of a visitor with any OTHER library. If I were to take approach 1, I would be mutating each library document an average of 75 times a day. If I were to take approach 2, every time I fetch the data for the frontend, I would need to filter it for the ObjectID of the Library. Between the options of Approach 1, Approach 2, or the hybrid approach of doing both, which is better, in terms of data integrity, possibility, speed, size, and correct implementation? submitted by /u/BeastModeUnlocked [link] [comments]

Hi everyone, For university I'm currently working on a garbage sorting bin that will allow users to scan barcodes on products they want to dispose of, and the bin will sort the waste into the appropriate category. However, I'm having trouble finding a database that associates waste types with barcodes. I was wondering if anyone here has any advice on where I could find such a database? Or how best to go about creating such a database on my own. I've already tried searching government websites and waste management companies, but haven't had much luck. I'm also looking for a database that can be used in the Netherlands, if that makes a difference. Any advice or suggestions would be greatly appreciated! Thank you in advance for your help. submitted by /u/Tomtom305 [link] [comments]

I am trying to design a database for my own company. These are the events I need to record in my database: A client might order items I ship items with an invoice Items are made of one or more materials I purchase materials from suppliers Some materials are damaged and discarded The question I have is this: Do I keep the sales and purchase history records in the same database where my client and item details reside? Or is it a better idea to move the "historical" data to another database, and have a separation of OLTP-OLAP systems? Because the historical data will just be inserted and queried. But the other operational data will be updated and even deleted with time. submitted by /u/Mycroft2046 [link] [comments]

Looking for advice on where to start with creating a database. Only previous database experience i have is Microsoft Access. Not sure even what software i should use. Basically i want to create a database with a table containing members details (Member No., Name, Address, Ph. No. etc.) and be able to link this to multiple other tables which will contain registration details for individual pigeons. (one table for each year, which will have up to approx. 15000 entries). Fields will basically be, ring no., year, type, club, flyer number. At the moment we're issuing about 15000 rings for racing pigeons each year to flyers. And i have been trying to track this using excel spreadsheets, which works fine until people start buying/selling individual birds between each other, which means i have to record the change of ownership. I need to be able to look up an individual ring number, and have that link to the owner, so in the case where a bird is found, i can quickly determine who the owner is. and also do things like run a query to list all the birds registered to a particular owner. Not sure if this makes any sense, but just looking for recommendations for software / database types to use and where to start. submitted by /u/Mental_Task9156 [link] [comments]

I'm about to have a degree in Cyber Security but I have free college so I might aswell get my masters right? However, University of Florida dosent have an IT major. They do however have Data science, Information systems (college of buissness), and computer science. Data science sounds sexy, looks lucrative from what I've read. Bad idea or no? submitted by /u/Bulky_Iron_1421 [link] [comments]