Relational Database Management System, a widely used type of database management system characterised by its extensive use of joining as a core operational principle.
41
votes
5answers
7k views
What are the differences between NoSQL and a traditional RDBMS?
What are the differences between NoSQL and a traditional RDBMS?
Over the last few months, NoSQL has been frequently mentioned in the technical news. What are its most significant features relative to ...
27
votes
5answers
2k views
Which database could handle storage of billions/trillions of records?
We are looking at developing a tool to capture and analyze netflow data, of which we gather tremendous amounts of. Each day we capture about ~1.4 billion flow records which would look like this in ...
5
votes
2answers
494 views
Single Drive vs Multiple Drives
Generally bottleneck of RDBMS (I am a MySQL user) performance is disk access. SSD provides great performance compared with conventional spindle drives.
Question : Is it possible to improve ...
4
votes
1answer
110 views
how much overhead an error in RDBMS has?
I have a class in my project. On the class I need to do two inner select, to know is there any duplication or not, but I think if I get duplication error and then manage that is better than to select.
...
3
votes
3answers
441 views
MySQL very slow query when changing one WHERE field despite no index/key
This is quite a confusing issue for me. I have a database full of baseball statistics. Running this query:
SELECT * FROM hits
JOIN stadiums ON stadiums.gameName = hits.gameName
JOIN players ON ...
20
votes
4answers
2k views
What does “index” mean on RDBMSs? [closed]
I use indexes like most developpers do (mostly on... well ! index), but i'm sure there is a lot of subtle way to optimize a database using index. I'm not sure if it is specific to any implementation ...
6
votes
1answer
173 views
Are relations slower than a big, inefficient table?
I've been asked in my job to violate the first normal form (repeating groups across columns, using empty / null values) several times, "for the sake of computer processing power". In a nutshell, a ...
3
votes
1answer
199 views
How to Update same table on deletion in MYSQL?
In my Database I have a table: Employee with recursive association, an employee can be boss of other employee.
Following is query I used to create table:
CREATE TABLE IF NOT EXISTS `Employee` ...
2
votes
1answer
122 views
Restriction on self referencing on insert in MYSQL?
How to restrict insert on adding self referencing rows in a recursive relation table (a table contains foreign key points itself).
mysql> SELECT * FROM Employee;
...
1
vote
1answer
141 views
Is there an Oracle rdbms monitoring API?
We have about a thousand customers with our application installed out of which 500 have an oracle database.
Monitoring the database is only one of the requirements.
Installing Oracle Enterprise ...
