Database design: how is the effectiveness of a data model measured objectively?

I am not sure which topic this belongs to, but I am investigating the theory behind the following questions:

What is the best data model for a particular data set (let's say this data set is large, but arranged for simplicity)?

Are there any universal measures that are optimized with respect to data compression?

What are the variables that affect & # 39; effectiveness & # 39; of a data model?

I have done some research on the subject, and the concept of entropy is often mentioned in relation to information coding in general and text compression in particular. Has anyone in the world of database / content modeling explored a similar topic?

Any pointer would be much appreciated.

Your opinion on the effectiveness of mobile applications in business.

I am interested in your opinion on the effectiveness of mobile applications in business. Should I request your development for a small online store or is it a waste of money?

privacy: Is there any study on the effectiveness of government cybersecurity agencies to prevent terrorist attacks?

Government cybersecurity agencies are blatantly spying on their own citizens. They justify all data collection by stating that they are capable of identifying terrorist threats. So, are there statistics from non-governmental cybersecurity agencies about the terrorist attack plan that these agencies have captured?

The reason why I ask is because I understand that the lack of intelligence means a greater risk for all citizens. However, excessive information is another concern due to a possible abuse of power (for example, the government of China) and individual privacy. If the argument is reduced to a conceptual argument of people who renounce Privacy (data) for Security (against Threats / Terrorists), how do we know that it is mainly a security theater as the failure rate of 80% of the TSA to detect terrorists or have adverse effects? For example, as the government collects more data, more tools are developed to protect privacy. As more tools are developed to protect privacy, criminals and terrorists will adapt to the use of those tools and the government will only be spying on an innocent civilian.

dnd 5e – Do I correctly evaluate the effectiveness of a mystic's skills in CQC, fighting a jellyfish?


Petrifying look.

When a creature that can watch Medusa's eyes begin their turn 30 feet from the jellyfish, the jellyfish can force her to make a DC 14 Constitution save roll if the jellyfish is not Disabled and can see the creature.


A monster with tremorsense can. detect and identify the origin of the vibrations within a specific radius, provided that the monster and the source of the vibrations are in contact with the same background or substance.

Blind view

A creature with blind vision can perceive Your environment without depending on the view, within a specific radius.

The perfect senses

You get an acute sense of smell and an instinct to detect prey. You can watch Creatures and invisible objects within 10 feet of you, even if you are blinded.


A creature that only uses the tremor sense can only indicate the location of the Medusa. Because of this, such a creature could not see his eyes, and therefore would not be affected by his face. Even if she stays still, she still has a throbbing heart or other functions that could create vibrations.

As for Perceiving the sight, if you look through your own blindfold and see their eyes, you can be petrified. Nowhere in Petrifying Gaze's text do you see that your eyes must see, only you, that you have not hidden yourself.
Perceiving the invisible is essentially the same. If you can avoid seeing their eyes, just by looking at their auras, you should be fine.

The blind view is funny, but RAW, does not "see" it. Affirms that instead perceive. Because of this, and because it specifically says that one must "see" the eyes of the jellyfish in petrifying gaze, the blind characters are quite safe from that attack.

In the Perfect Senses text, we see that the word "see" is used explicitly. If you had this and looked at the Medusa, you are a gonner.

Spells and attacks

Most spells require you to see your objective. These spells would not work against Medusa like RAW while you were using only the trembling sense. However, if your DM is good, they can allow you to cast the spell at a disadvantage on your roll or give the Medusa the advantage of their salvation, or a similar mechanic, just to see if you can point to the right place.

As for the attacks with weapons that use only the sense of trembling, you will again be at a disadvantage, since the rules say that you must be able to see your target.

When you attack a target that you can not see, you have a disadvantage in the attack roll. This is true if you are guessing the location of the target or if you are targeting a creature that you can hear but can not see. If the target is not in the location that you targeted, you fail automatically, but the GM usually only says that the attack was not made, not if you guessed the location of the target correctly.

BUT NEVERTHELESS, this tweet by Jeremy Crawford It establishes that creatures with blind vision can see effectively. This means that targeting creatures with spells and attacks that require you to see the individual are not at a disadvantage.

Usability and effectiveness of the use of a safety net to create a safe experience for the user

With regard to saving as you leave, I will follow Google's path, informing the user that "All changes are saved in Drive.".

However, there is a type of actions to which I would add "save" so that users feel more comfortable. I guess the question It is my document (or whatever) saved?" the user asks him when he tends to leave it, either when the work is finished or when he can not continue working at this time. Therefore, if there is a button that allows the user to leave the document ([Quit], [Exit], [Close] or anything that leads to a logically different area, such as [Preview]) I would simply change the text to [Save and quit] or [Save and preview] (although it is almost obvious that the work is saved before the preview). Simply omit the actions that "fork" from the main route, such as print or export, this does not affect the main use flow, of course, everything depends on a specific system.

Interestingly, I find it necessary only For people of a certain age, those who remember applications that might work in this way, I mean close without saving or even asking to save something with the changes in progress. I think that people under 30, for example, will need it significantly less than older people. But this is just guessing. We come from breakpoints in the technocultural space, severely distorted throughout its t axis. So everything needs to be tested, without it "I can only say what I think the users think", as someone said;)

dnd 5e – What accessories could you give an animal companion Hawk to improve its effectiveness in the battle?

It's not incredibly practical, but you can take magic started feat and take Warlock / Druid cantrip Magic Stone. Depending on your DM's decision, can he allow the hawk to throw magic stones at the enemies?

Magical stone states:

You or someone else can make a remote spell attack with one of the
Pebbles throwing it or throwing it with a harness.

If your DM feels comfortable allowing the hawk to throw magic stones (throw them), then it's a free 1d6 + Wis. Once again, not openly practical, but a thought!

What accessories could you give to a familiar Hawk to improve its effectiveness in the battle?

I was thinking maybe poisoning their claws, but I would have to keep beating their claws in poison at every encounter. Anything else you can think of?

Mining for a few months; Any advice on things that could improve effectiveness?

I have been running BTC and LTC for a few months and I realized how difficult it is to make a profit with all the competition. Did you want to know from very experienced miners any ideas about what you could do to improve the effectiveness of daily mining activities?

What is the keyword effectiveness index?

What is the keyword effectiveness index?