development process – How to prevent bugs in enterprise-level configurations with a discipline similar to that of source code?

We have a system that allows our customers to coordinate their customers (buyers) so they can deliver their shopping within 45 minutes of order creation.

Each customer has a set of stores where orders are processed by buyers
and each customer has a schedule that specifies in which store and what time he / she will work.

However, we also have a feature that allows them to create orders only if the store is already set up in our systems and there are enough buyers at the time we plan to deliver the ordered.

As you can see, checking the acceptance of an order given in our system depends on the current time, store configuration and the program of the buyer.

We have managed our source code quite well: we perform code review, unit testing, and integration testing. However, we did not find a satisfactory way to manage store configurations, calendars and are as sensitive as the source code if there was a misconfiguration, for the client, it would be almost the same as if we had a bug in our source code because we would not let him create orders and their sales would decrease.

We would therefore like to find a way to manage the store configuration and schedules with a discipline similar to that used with our source code. we would like to have a way to test if the configuration is correct. Currently, we do this configuration via SQL scripts that are testable but the contributions may not be correct and we have no way to handle them or test them if they are correct.

Did you have a similar problem? Do you know of any tools, languages, or processes that would prevent us from making errors in the client configuration and having a centralized way to know what the actual configuration is in addition to examining the database tables?

By the way, we receive these configurations as spreadsheets from professionals who are talking to the customer.

Turing machines – Number of LBA configurations (bounded linear automaton)

If you have $ g $ symbols (including a blank) and a waist band $ n $ then there is $ g ^ n $ words of length $ n $. It's really a basic combinatorics: the reasoning is that you have $ g $ options for the first symbol, $ g $ options for the second symbol, i.e. $ g ^ 2 $ options for the first two symbols. Then again $ g $ options for the third symbol, giving you $ g ^ 3 $ options for the first three symbols and so on. If you are not convinced, try for example a $ 3 $-alphabet symbol.

From your tape to length $ n $ there is $ n $ possible head positions, so you multiply the number of strings on the band with $ n $.

Finally, there is $ q $ states, so for every possible chain on the band and every possible head position we can be in one of the $ q $ states, doing $ qng ^ n $ configurations of the Turing machine.

Using Bootstrap to realize different configurations of divs

I am learning Bootstrap. But I decided to ask first of all if it is possible to organize the div as you see in the attached image.

When the width of the screen is greater than 800 pixels, I would like the divs 1, 2 and 3 to appear side by side. When the width of the screen is between 600 and 800 px, I would like divs 1 and 3 side by side and div 2 below. Divs arrangementWhen the screen width is <600 px, I would like div 3 up, div 1 down and div 2 down.

If it is possible to do this with Bootstrap, I would be grateful to know how to do it.

Thank you.

restore – Postgres completely ignores the configurations defined in the postgresql.conf file

Whenever I start the server, it seems to completely ignore all configuration settings. My data directory is an external drive, so I use pg_ctl -D /Volumes/Data/Postgres start to start.

It only accepts localhost connections on port 5432, which I confirmed by show listen_addresses; even if the configuration file contains the following elements in the connection parameters:

#listen_addresses = '*' # what IP address(es) to listen on;
                    # comma-separated list of addresses;
                    # defaults to 'localhost'; use '*' for all
                    # (change requires restart)
#port = 9000                # (change requires restart)

I've also checked the file because it apparently replaces the configuration file and is completely empty.

For the record, the database is repeatedly overwritten due to a power outage / connection issues … but it still works, it seems, because I can connect locally …

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What are the different configurations when testing a website?

Hello friends,

What are the different configurations to take into account when testing a website?

nikon – Need help choosing between two configurations of DSLR / lens

Currently, I use the camera of my smart phone to photograph cars, trucks and auto racing. I photograph outdoors, mainly in broad daylight, but often in dark and overcast weather. From time to time, I can shoot at dusk. I decided that the camera on my smart phone was not giving the desired results. It works poorly in low light conditions, rarely produces crisp images, lacks manual settings and its fixed viewing angle is awkward and is not long enough to reach my subjects. So, I am looking to buy a digital SLR and a professional lens. After an exhaustive navigation, I reduced my options to:

a) A brand new Nikon D3500 with AF-P Nikkor DX 70-300 f / 4.5-6.3


b) A brand new Nikon D7500 with AF Nikkor 80-200 f / 2.8D ED used (two-key version)

At this point, I have focused mainly on these two choices and it is unlikely that I will consider anything else.

The problem is that I am "on the fence" and that I can not make up my mind. My questions are not about cameras, but about goals:

  • The AF-P 70-300 DX costs less than an 80-200 from the occasion. I hear that it's also very clear in the entire zoom range and that its focus speed is super-fast, which is great for my uses. My only concern is the low variable aperture.
  • The 80-200 looks to be built to last a lifetime: much more rugged than the 70-300 lens. I have read many conflicting reviews on the visual acuity and the AF speed of 80-200. That made me doubt the performance of the 80-200 for action photography in 2019. It is an old film-era goal with an optical formula even older. Since the autofocus and the sharpness of the screw are questionable, I am not sure that the work can be done for me. Honestly, it seems to be more suitable for portrait photography. The reason why I still consider it to be the fixed f / 2.8 aperture and the secondhand copies are relatively inexpensive.

It seems to me that in recent years, most of the progress and improvements in lens design have been done with the zooms. For this reason, although it is a plastic lens with variable aperture kit, I think the 70-300 is as sharp as the 80-200 in the shared zoom / open range.

I would like to take panoramic photos and freeze in order to use slower shutter speeds, which can go up to 1/2000 seconds. Will the narrow opening of the 70-300 be able to withstand a cloudy or dusky sky? Will I need to mount ISO to the point where the picture becomes extremely noisy? If I choose the 80-200, will it be as sharp as the 70-300 with the DX high pixel density sensor? Or will it be solved?

So I want confirmation or negation of the statements I have made about each goal so that I can make a decision. If someone has practical experience of one or both goals, I would appreciate your experience.

At the end of the day, I want to focus on my images. I just need a camera and a lens capable of doing the job with a minimum of compromise and giving me results far superior to those obtained with my smartphone. My apologies if my question was long; I'm just trying to be as thorough as possible to get accurate answers.

Server Management, Server Monitoring, Server Migration

This is a discussion on 24×7 remote computer support: server management, server monitoring, server migration in the Webmaster Marketplace forums, part of the enterprise category; Whether on Linux or Windows, Server Management, Server Administration, cPanel Server Management, Server Migration, Server Monitoring, VPS Management, Cloud …


UI test for multi-screen configurations

I was wondering if there were tools / systems that could simulate multiple screens to use for UI tests.

The context:
We develop an application that can have multiple windows, depending on the configuration of the user. We would like to test (manually) such configurations with more than 2 monitors, even if the developer / tester only has 1 to 2 monitors. We do not need to automate these tests. Being able to view it from time to time when we make more significant changes to the UI would be enough.

Thank you.

What if I create configurations in a single product?

What will happen if I create configurations in a single product? Will the simple product switch itself into a configurable product?