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Why do we need message brokers like RabbitMQ over a database like PostgreSQL?
...ing on the size of your project, you may also want the message passing component separate from your database, so that if one component experiences heavy load, it need not hinder the other's operation.
As for the problems you mentioned:
polling keeping the database buzy and low performing: Using R...
How do I quickly rename a MySQL database (change schema name)?
...u username -ppassword -sNe "rename table old_db.$table to new_db.$table"; done
OR
for table in `mysql -u root -ppassword -s -N -e "use old_db;show tables from old_db;"`; do mysql -u root -ppassword -s -N -e "use old_db;rename table old_db.$table to new_db.$table;"; done;
Notes:
There is no ...
mongodb: insert if not exists
...le:
now = datetime.utcnow()
for document in update:
collection.update_one(
{"_id": document["_id"]},
{
"$setOnInsert": {"insertion_date": now},
"$set": {"last_update_date": now},
},
upsert=True,
)
...
How to center icon and text in a android button with width set to “fill parent”
...hat are compatible with strings in Android. If you can find an acceptable one, this is a simple solution, and it has the added bonus that it will scale with text size. For instance, it has an envelope for an email icon and a couple of different phones for a call button.
– GLee...
How to use a WSDL
...SayHello("World!");
If you need to specify the remote URL (not using the one created by default), you can easily do this in the constructor of the proxy client:
YourServiceClient client = new YourServiceClient("configName", "remoteURL");
where configName is the name of the endpoint to use (you ...
How do you give iframe 100% height [duplicate]
...it with CSS:
<iframe style="position: absolute; height: 100%; border: none"></iframe>
Be aware that this will by default place it in the upper-left corner of the page, but I guess that is what you want to achieve. You can position with the left,right, top and bottom CSS properties.
...
Logical XOR operator in C++?
...t is the first time I encountered a practical need for it, but I don't see one listed in Stroustrup . I intend to write:
1...
How do I compute derivative using Numpy?
...ivatives by hand.
Finite differences require no external tools but are prone to numerical error and, if you're in a multivariate situation, can take a while.
Symbolic differentiation is ideal if your problem is simple enough. Symbolic methods are getting quite robust these days. SymPy is an exce...
Java Reflection: How to get the name of a variable?
...date" section below.
Complete information is often stored in class files. One compile-time optimization is to remove it, saving space (and providing some obsfuscation). However, when it is is present, each method has a local variable table attribute that lists the type and name of local variables, ...
Objective-C: Reading a file line by line
...(large size of text), then use the method that other people here were mentioned such as buffered (reserve the size of the text in memory space).
Say you read a Text File.
NSString* filePath = @""//file path...
NSString* fileRoot = [[NSBundle mainBundle]
pathForResource:filePath ofT...