Categories
Database Development

Will Blocking cause timeout issue

When i checking in sys.sysprocesses in SQL 2008R2 more number of blocking sessions are there. Most of them are insert,update,delete statements and wait types are locks. Whether this will cause time out issues??? any one can confirm whether this will cause time out/performance issue?

Categories
CMS Magento Mastering Development

Upgrade 2.4.0 to 2.4.1 composer fails

I’m working with a composer 2.4.0 and try to install 2.4.1 According docs [x] Determine whether your current catalog search engine is supported [x] Complete the Update and upgrade checklist [x] Set the pub/ directory root [x] Check PHP and environment settings [x] Switch to maintenance mode bin/magento maintenance:enable [X] Check the status of cron […]

Categories
Database Development

How to hot merge MariaDb databases from multiple servers into a single one

Current Configuration I currently have 3 servers: server australia with the database canberra servers belgium and germany are a galera cluster with the database bruxelles. Target Configuration My final goal is to merge both databases into a single galera cluster: servers australia, belgium and germany will be a galera cluster with the databases canberra and […]

Categories
Mastering Development

python datatable, string manipulation on column

from datatable import dt, f, g, by, update, join, sort tt = dt.Frame({‘a’ : [‘A1′,’A2′,’A3’], ‘b’:[100,200,300]}) print(tt) | a b — + — — 0 | A1 100 1 | A2 200 2 | A3 300 [3 rows x 2 columns] How can I remove the ‘A’ in the a column and assign it to […]

Categories
Mastering Development

OPENGL (GLFW), glDrawElements gives out “Acces.ViolationException”

(I’m a pretty new Coder (at least in Graphics programming), so don’t be too harsh with me 🙁 ) Today I tried to render a simple triangle using the C# implementation of OpenGL (GLFW), I followed the web tutorial from "LearnOpenGL.com" specifically the hello triangle tutorial. I’ve completed the entire tutorial and expect the program […]

Categories
Database Development

Does commit after a normal select can call any fsync or flush operations?

I’m using Mariadb 10.2.16. 3 Node cluster. Coms counts taken at particular time for all 3 (insert,update,commit). Com_inserts are in 1.1K Com_updates are in 1.6k Com_commit are in 10K When enabling general log, I could see after each selects there is a commit. Would this unnecessary commit can cause any fsync or any flush opertation […]

Categories
Database Development

Does commit after a normal select can call any fsync or flush operations?

Coms counts taken at particular time for all 3 (insert,update,commit). Com_inserts are in 1.1K Com_updates are in 1.6k Com_commit are in 10K When enabling general log, I could see after each selects there is a commit. Would this unnecessary commit can cause any fsync or any flush opertation to the server? innodb_flush_log_at_txn_commit=0.

Categories
Mastering Development

Spring Boot 2.2 Multi Module Project auto configuration JPA failed

I have a Spring-Boot multimodule Project. Main Module is a Vaadin Web-App (at the Moment very simple) and a second Module called Login with Spring Entitys, Repository and Service bean. In the Login Module I have written Testcode that runs against a H2 Database. Tests are green, Entity was created, repository exists and so on. […]

Categories
Mastering Development Software

RESTful API User Accounts

I’m trying to expose RESTful API endpoints for creating user accounts to access my API. So, this would be one of the first things my consumers would use. I’m trying to figure out if this is how I should implement the endpoints, so any feedback / guidance (particularly in complying with REST principles) is highly […]

Categories
Mastering Development Software

What naming convention to use for a project with a controller, service, and repository layer?

So, the API has three layers it goes through; controller, service, and repository. For the controller, I can name the methods according to CRUD; create, read, update, and delete. What should I do for the service and the repository? For some background, I’m developing a NestJS project with MongoDB as the DB. Here’s a rough […]