Tag: row

Feed: R-bloggers. Author: Econometrics and Free Software. If you haven’t, you should read this first. This is part two. Speedrunning is the… hrm… – sport? art? – of playing games from start to finish as fast as possible. Speedrunning requires an insane amount of knowledge of the game being played, as well as an enourmous amount of skill. Also, contrary to what you might think, it is a community effort. Players do speedrun the game alone, and it is a ferocious competition, each one of them aiming for the top spot on the leaderboards. But discovering the strategies that will ... Read More

Feed: R-bloggers. Author: Econometrics and Free Software. The past few weeks I have been exploring the speed of R. It started with this video in which I explained that R is not necessarily slower than any other interpreted language, as long as you’re using the built-in, optimized functions. However should you write your own implementation of an algorithm, especially if that algorithm requires the use of one (or more…) loops, it’ll run slowly. As I’ve also mentioned in two other videos, here and here there are many ways to avoid loops, and you should do so if possible. To continue ... Read More

Feed: AWS Big Data Blog. In any business intelligence system, securing and restricting access to the data is important. For example, you might want a particular dashboard to only be viewed by the users with whom the dashboard has been shared, yet customize the data displayed on that dashboard per user by implementing row-level security. With row-level security, you can grant and restrict access to only specific rows, all rows, or no rows of any dataset. Organizations typically want to display different data to users within different business units. To do this, we need to traverse the organizational hierarchy to ... Read More

Feed: AWS Big Data Blog. In a world where data security is a crucial concern, it’s very important to secure data even within an organization. Amazon QuickSight provides a sophisticated way of implementing data security by applying row-level security so you can restrict data access for visualizations. An entire organization may need access to the same dashboard, but may also want to restrict access to the data within the dashboard per the organization’s hierarchical structure. For instance, vice presidents need visibility into all data within their organization, team managers need to see the data related to all their direct reports, ... Read More

Feed: R-bloggers. Author: sang-heon lee. [This article was first published on K & L Fintech Modeling, and kindly contributed to R-bloggers]. (You can report issue about the content on this page here) Want to share your content on R-bloggers? click here if you have a blog, or here if you don't. This post makes a useful wrapper R function merge() for left outer join, which preserves the orders of row and column of input x data. It is not a must but useful when we prefer these fixed orders in some case. Left Outer Join which we try to do ... Read More

Feed: AWS Big Data Blog. Increasingly, customers are looking at data lakes as a core part of their strategy to democratize data access across the organization. Data lakes enable you to handle petabytes and exabytes of data coming from a multitude of sources in varying formats, and gives users the ability to access it from their choice of analytics and machine learning tools. Fine-grained access controls are needed to ensure data is protected and access is granted to only those who require it. AWS Lake Formation is a fully managed service that helps you build, secure, and manage data lakes, ... Read More

Feed: Planet PostgreSQL. Last time, we discussed object-level locks and in particular relation-level locks. In this article, we will see how row-level locks are organized in PostgreSQL and how they are used together with object-level locks. We will also talk of wait queues and of those who jumps the queue.Row-level locksOrganizationLet's recall a few weighty conclusions of the previous article.A lock must be available somewhere in the shared memory of the server.The higher granularity of locks, the lower the contention among concurrent processes.On the other hand, the higher the granularity, the more of the memory is occupied by locks.There is ... Read More

Feed: AWS Big Data Blog. We announced the preview of AWS Lake Formation transactions, cell-level and row-level security, and acceleration at AWS re: Invent 2020. In Parts , , and of this series, we explained how to set up governed tables, add streaming and batch data to them, and use ACID transactions. In this post, we focus on cell-level and row-level security and show you how to enforce business needs by restricting access to specific rows. The goal of modern data lakes is to democratize access to broad datasets to empower data analysts and business users. In these scenarios, data ... Read More

Feed: Planet PostgreSQL. Last updated on 22 June 2021 In this article, we take a look at different ways to set row-level privileges in PostgreSQL. Before we proceed, let look at privileges in the context of database systems. Blixy can take care of your rows security What are privileges? Privileges a way of granting rights to a specific group of people to allow them to perform a specific task such as access data in a table or even delete a table. For instance the following commands allows users jones , steve , and davies to access all data in a ... Read More

Feed: Matillion. Author: Julie Polito; Here at Matillion, we’re honored to receive any award. But the ones that mean the most to us are the ones that come from our most important judges: Our customers. That’s why we’re thrilled to announce that TrustRadius has recognized Matillion with a 2021 Top Rated Award for Data Integration. This is the third time in a row we’ve been recognized for a Top Rated Award, having earned the honor in 2019 and 2020.  Matillion being Top Rated again in 2021 is a big deal to us. What does it mean for Matillion to be a ... Read More