Skip to main content
OverflowAI is here! AI power for your Stack Overflow for Teams knowledge community. Learn more
216 votes

Benefits of Structured Logging vs basic logging

There are two fundamental advances with the structured approach that can't be emulated using text logs without (sometimes extreme levels of) additional effort. Event Types When you write two events ...
Nicholas Blumhardt's user avatar
119 votes

Should I define the relations between tables in the database or just in code?

The database doesn't have to check for data integrity every time application modify data. This is a deeply misguided point. Databases were created for precisely this purpose. If you need data ...
Kilian Foth's user avatar
94 votes
Accepted

Why is using MySQL for a dictionary website a bad idea?

I can't tell you why it's a bad idea. I can tell you a bunch of reasons why a relational database is a good idea though. Remember that not everyone consults a dictionary for a definition. More times ...
Greg Burghardt's user avatar
71 votes
Accepted

Should I define the relations between tables in the database or just in code?

TL;DR: Relationship constraints should go in the database. Your application ain't big enough. You are correct, indeed, that enforcing relationships across databases may require enforcing them in the ...
Matthieu M.'s user avatar
68 votes
Accepted

Can it be acceptable to construct SQL queries dynamically?

On one hand, I don't like such braindead rules, since they are clearly an oversimplification. A better wording would be IMHO You shouldn't construct SQL queries dynamically using unsanitized input ...
Doc Brown's user avatar
  • 208k
62 votes

Should I use DATE or VARCHAR in storing dates in MySQL?

I don't understand as to why the DATE data type exists Always store Date values in Date Fields. What PHP gives you back when you retrieve those values is a Character Representation of the Date value ...
Phill  W.'s user avatar
  • 12.3k
60 votes
Accepted

How to store a fixed length array in a database

"adding 24 columns to the draft table seems more efficient to me" show me all the drafts which include player 2. select * from draft where p1=2 or p2=2 or p3=2.... vs select * from draft ...
Ewan's user avatar
  • 76.3k
52 votes

Should I define the relations between tables in the database or just in code?

The constraints should lie within your database, as (with the best will in the world), your application will not be the only thing to ever access this database. At some point, there may need to be a ...
Paddy's user avatar
  • 2,623
46 votes
Accepted

Is it possible/advisable to combine unit testing and integration testing?

Is it possible/advisable to combine unit testing and integration testing? Doing both unit testing and integration testing? Overwhelmingly yes. Mashing them together in a single test suite? Not ...
Flater's user avatar
  • 51.7k
27 votes

Why is using MySQL for a dictionary website a bad idea?

If you go with the key-value store (which offers you a more impoverished programming model) and it turns out you need more structure (in your case, say, adding a third language), or you need to do ...
Erik Eidt's user avatar
  • 34.1k
24 votes

Should I use DATE or VARCHAR in storing dates in MySQL?

In programming, we are always working with abstractions and representations: The text string 2021-02-09 12:47:14 UTC is a representation of a particular point in time. The integer 1612874834 is a ...
IMSoP's user avatar
  • 5,857
23 votes

How to store a fixed length array in a database

Unmeasured efficiency concerns are poor arguments for design decisions. If you really believe there is an efficiency issue develop a performance requirement based on your actual needs. Create a test ...
candied_orange's user avatar
20 votes

Can it be acceptable to construct SQL queries dynamically?

There's a whole tonne load of things that can go wrong with dynamically constructed queries. Hence the rule. sql injection attacks non-performant queries non cached queries server specific settings, ...
Ewan's user avatar
  • 76.3k
18 votes

Benefits of Structured Logging vs basic logging

When you are collecting logs for processing, be it for parsing into some database and/or searching through the processed logs later, using structured logging makes some of the processing easier/more ...
Castaglia's user avatar
  • 287
17 votes

Should I define the relations between tables in the database or just in code?

You should have relations in the database. As the other answer notes, performance of constraint checking will be far better inside that database than inside your application. Database constraint ...
Kirk Broadhurst's user avatar
13 votes

Should I define the relations between tables in the database or just in code?

We no longer live in one back-end <-> one front-end world. Most solutions involve a web front-end, a mobile front-end, a batch-front-end, and iPad front-end, etc. Database engines already have ...
Tulains Córdova's user avatar
13 votes

Should I use DATE or VARCHAR in storing dates in MySQL?

But everytime I echo the date and time in PHP it just gives me a string, not a date object. That's basically just the quirk of your DB access library. When it comes down to it, all data are reducible ...
Lie Ryan's user avatar
  • 12.4k
12 votes
Accepted

Is indexing foreign keys a good practice?

Most, if not all, RDBMS automatically create an index on a FK because a FK means you will be doing joins using those columns. It's standard RDBMS behavior based on the fact that you will be using ...
Tulains Córdova's user avatar
12 votes

Is it safe to put SQL statements in my C# application?

The "we don't have the resources" line is a red flag to me. You're either going to pay to do it right, or you'll have to pay for doing it wrong. I know which I'd pick. While your use case is ...
Paul's user avatar
  • 3,317
11 votes

Benefits of Structured Logging vs basic logging

You won't find much benefit from structured logging when your app creates a few hundred log messages per day. You definitely will when you have a few hundred log messages per second coming from many ...
Anthony's user avatar
  • 231
11 votes
Accepted

How to test data based on SQL queries?

Been there, done that. First let's make something clear: That's not unit testing. Unit testing is about code. You are not runnning the tests after a code change to test if code alterations ...
Tulains Córdova's user avatar
11 votes

Should I use DATE or VARCHAR in storing dates in MySQL?

Size A MySQL DATE is 3 bytes. Each char is a VARCHAR is 1 byte. Which means your VARCHAR date is at least 2.67 times the size of a DATE. 3.33 if you include separators. Or much larger if your ...
Xavon_Wrentaile's user avatar
11 votes

Can it be acceptable to construct SQL queries dynamically?

It can be acceptable to concatenate SQL, but only under a very narrow and specific set of circumstances. Before reading this answer, you should read Doc Brown's and Ewan's answers for a good warning. ...
Greg Burghardt's user avatar
10 votes

Why is using MySQL for a dictionary website a bad idea?

For a database this small, it's probably not going to make much difference for performance. A standard RDBMS isn't a terrible idea here because presumably, there should be far more reads than writes ...
JimmyJames's user avatar
  • 27.4k
10 votes

Application/Database design where two tables have both 1-to-many and 1-to-1 relationships

Think longer term - eventually... there will be a MegaCar 2.0 Or there will be another new car company with only the one model. Or one model companies all go out of business. Keep it the way you ...
ivanivan's user avatar
  • 317
10 votes

Do we have 2 logical query processings, one with indexes and one without indexes?

tl;dr: Query planners are a big deal. In general, before an RDBMS backend executes a query, it first plans the query. There's more than one way to access the data, and the planner evaluates some of ...
J_H's user avatar
  • 7,148
9 votes

Should MySQL database tables only have a single unit of information per row?

Your coworker is actually right about this. If you're taking measurements from all your sensors at the same interval, and the set of sensors you're recording from remains constant or mostly constant, ...
Mason Wheeler's user avatar
9 votes

Transaction handling in DAO or Service layer in pure JDBC without frameworks

Sorry for the rather long answer. I think, for a modern application approach, you should consider the connection to be injected into the dao, not taken from a factory. Your problem is, as I ...
thst's user avatar
  • 216
8 votes

When dealing with tens of billions of rows in a web app table, would a NoSQL database be noticeably faster than a relational one?

No startup has ever written the first version of their software with this kind of scalability in mind. Facebook started out in PHP, and wrote a cross-compiler to convert their PHP code to C++ to ...
Robert Harvey's user avatar
8 votes
Accepted

Using a relational and a non-relational database in the same project?

For example if I go on a run three times a week for 1 hour there will be 10'800 new records per week, now imagine this with 1000 active users for a year. Well, let's not imagine, but actually ...
Arseni Mourzenko's user avatar

Only top scored, non community-wiki answers of a minimum length are eligible