How to handle database connections?
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There are ten answers to this question.
Best solution
Here my problem; in such a case it complains about duplicate connections with same connection name: Test::Test(QString connectionName) { db=QSqlDatabase::addDatabase("QMYSQL",connectionName); } int main(int argc, char *argv[]) { QString connectionName=QString("test"); QCoreApplication a(argc, argv); Test myDb(connectionName); Test myDb2(connectionName); return a.exec(); } Here my solution: Test::Test(QString connectionName) { if(!QSqlDatabase::contains(connectionName))...
Answer:
-- I would prefer adding the Database connection in a static portion of code. Not executing everytime...
metdos at Stack Overflow Mark as irrelevant Undo
Other solutions
My application uses MongoDB as database. We are expecting 20K+ simultaneous connections to mongodb cluster. How should I config the server if I want to run the mongodb on 20 servers and shard the cluster 20 ways? Here is what I've done so far: On each...
Answer:
In a sharded configuration each mongos will have 1 incoming connection from the client but may need...
Alvin Richards at Quora Mark as irrelevant Undo
I'm searching for a way to build a recommendation system which can handle different types of contents like Locations/Places, Products, Movies, Books and so on. When a User enter a Book/Location/Movie Name the database should be search if it's already...
Answer:
There's a bunch of good work and smart people out there for you to reference and use. For semantics...
Steve McNally at Quora Mark as irrelevant Undo
Their docs say "Database performance on Heroku is measured by connections, memory, and CPU Units." but the pricing page only lists connections and memory for the dedicated databases. How many connections and how much memory does a shared database...
Answer:
Answer, from Heroku support: You should be safe with up to around 20 connections. If we detect you're...
Jordan Feldstein at Quora Mark as irrelevant Undo
Is it possible to write a query over two different database connections (both are oracle databases - they have different sign on credentials etc) I'm trying to join sales data on a server in the UK to product data on a server in France. Can I do this...
Answer:
This would be dependent on your programming language - typically you create a connection object or something...
Leon S at Yahoo! Answers Mark as irrelevant Undo
From what I know, both companies have many backend services running on their system, communicating with each other and with front-end. Many of these services would be relying on same database which produces resource contention due to limited number of...
Answer:
A good example at Twitter is our use of gizzard with Finagle. The simple answer is services don't talk...
David Barr at Quora Mark as irrelevant Undo
I'd like it to run on a single server on a small intranet. Users would fill out form details (a combination of drop down, text, and numeric entries) which would be stored in a database, and also folders with a lot of data could be uploaded through the...
Answer:
I don't know of anything out of the box that would do everything you are asking for. There are many...
Brett Hardin at Quora Mark as irrelevant Undo
I have to build an application which will have many active client connections (TCP) and these connections will remain active for prolonged period. How can I deploy code changes in my production server without breaking any of these connections (critical...
Answer:
No matter what scale you're at, be it an IRC server or a massively-multiplayer game, you're going to...
Clarence Leung at Quora Mark as irrelevant Undo
database is oracle, asp.net database connection work fine. anly asp doesn't work. Have error message that "Microsoft OLE DB Provider for ODBC Drivers (0x80004005) Specified driver could not be loaded due to system error 5 (Oracle in OraHome92)....
Answer:
according to my knowledge when you crate a data base in Vs.Net that must be create in DBMS which will...
lasith10... at Yahoo! Answers Mark as irrelevant Undo
Is it some kind of a graph database or more time tested RDBMS system? I want to create a massive graph of entities and relationship ( 5Bn + nodes) and I'm wondering which database would be the best for that. Performance is key and Apache license would...
Jeevitha Kirubanandam at Quora Mark as irrelevant Undo
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