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Note: If the problem that Google Earth won’t load appears after installing the latest driver, you might need to roll back to the older version of graphics card driver. Then check whether the problem has been fixed. Then follow the on-screen instructions to finish the operation.Īfter installing the latest driver software, you need to restart your computer and enable the stereoscopic 3D option in the NVIDIA control panel. Step 3: In the pop-up window, select Search automatically for updated driver software. Then right-click your graphics card and select Update driver. Step 2: In Device Manager, double-click the Display adapters category to expand it. Step 1: Right-click the Start button and select Device Manager. You can visit the NVIDIA website to get the latest graphics driver or follow the steps below to update the driver software. After that, enable the stereoscopic 3D option in the NVIDIA control panel. To solve the problem, you’d better update your graphics card. If you are an NVIDIA user, an outdated or corrupted graphics card driver could also be the reason for Google earth not loading. Solution 2: Update Your Graphics Card Driver If the problem that Google Earth won’t load still exists, you should move on to the next solution. On the upper right menu, check the OpenGL option. Then select Options > 3D View in the pop-up menu. You just need to launch Google Earth and click the Tools option from the top toolbar. Some users reported that they have fixed Google Earth not loading after choosing the OpenGL option for Google Earth. If you are bothered by Google Earth not working, not loading, or freezing issues, you can try the following fixes one by one to solve it. Why does this happen? Actually, the reasons for Google Earth not loading are various. Besides, users can also visit the web version of Google Earth in Google Chrome.Īccording to users, the problem that Google Earth won’t load happens sometimes. The program is available on many operating systems, including Microsoft Windows, macOS, Linux, Android, and iOS. Google Earth, formerly known as Keyhole Earth Viewer, is a program that offers a 3D representation of Earth based on satellite imagery. Solution 2: Update Your Graphics Card Driver.How to fix this problem? In this post, MiniTool Partition Wizard puts together some solutions. Unfortunately, some users reported that their Google Earth won’t load. Google Earth is a program that provides a 3D representation of an Earth-based map. When the above SQL query is executed, the output returned is pretty much exactly what we want: depth SELECT depth, from_id as parent, to_id as child SELECT 0, from_id, relation, to_id FROM relations WHERE from_id = 'root_org_id ' AND relation = 'is_superior_org ' UNION SELECT WITH RECURSIVE tree(depth, from_id, relation, to_id) AS ( I ended up with something like:ĬTEs are detailed and documented quite thoroughly, so it was really easy to come up with an initial CTE that would do what we wanted: Writing the query in SQL was pretty simple since there are plenty of tutorials on recursive CTEs. This essentially reduce our multiple SQL queries into a single one following the mantra of letting your database do the heavy lifting □ These expressions act somewhat like closures in that they allow us to run 'functions' on temporary results inside an existing SQL query, allowing you to further query based on the result of the previous. Building a solutionĪfter doing some research, we discovered that SQL has a mechanism which allows us to recursively query data called Common Table Expressions (CTEs). As our hierarchies grew large, the number of queries this would end up doing would increase exponentially. This implementation of traverse_hierarchy/1 essentially finds children via a depth first search, which is exhaustive and correct, simple and small however it also performs N+1 queries because we'd be making a call to get the children for the current node we were working on, and N calls to get the children of each child node. The original implementation looked a little like this:ĭef traverse_hierarchy ( organization_id ) do end It was built for simplicity with not much special focus on optimality however so after using this service in production for 14 months we started to notice that for particularly large organization hierarchies queries would end up taking quite awhile.Ī common query we performed was to get a list of all organizations, and recursively get all of the subordinate organizations for those organizations. Using this structure to store relations, we're able to store arbitrary relations between arbitrary entities, allowing us to do complex queries like getting all entities in all organizations that can be managed by an admin at a given tier of this hierarchy-in the example above, admin_1 would be able to manage all assets of all organizations and sub-organizations of org_1.ĭuring the MVP phase of the project, this microservice was thrown together pretty quickly and generally it worked well. We modelled this with the following database schema: from_id Organizations can be arbitrarily deeply nested.Admins in an organization have access to resources belonging to that organization, or any subordinate organizations.One organization can own many resources.One organization can have many subordinate organizations.Problem Overview & Backgroundįor the purposes of this post, we'll simplify greatly and use the following description of the system: In one of the projects I've worked on in the past, we were tasked to implement an attribute based access control microservice for managing permissions for different types of entities across different resources shared between different organizations. ecto.migrate does everything so we have the greatest compatibility with buildpacks, deployment tooling, etc.Querying Recursive Data Structures with SQL and Ecto I suppose I could do ecto.load, but I’d really like a straight migration path if possible (I.e. I’m guessing execute is only meant for single statements, not a full SQL script? Is that correct? If so, how can I run this script as part of my first migration? ** (Postgrex.Error) ERROR 42601 (syntax_error) cannot insert multiple commands into a prepared statement My SQL loads fine if I import it manually, but this migration gives me: Right now I’m doing: defmodule doĮxecute "CREATE EXTENSION IF NOT EXISTS \"pgcrypto\"" Right now I have a schema-only dump, and eventually I’d like to take a production dump of our data as well and modify migration 0 to massage our incoming data, after which point we’ll use migrations both in development and in production. My goal is to load our existing database dump in as migration 0, then to use migrations going forward. Trying to do something similar and am wondering if anyone has any pointers?Įssentially, we’re migrating another project with an existing Postgres database to Phoenix. |
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