Tagged Questions
0
votes
2answers
19 views
Partitioning MySQL for “expired” transactions to improve performance
I am dealing with an existing application that uses the database as a sort of transaction log in several cases, for example orders or payments. These tables are large (20 - 60 million rows) and poorly ...
0
votes
0answers
28 views
How to perform ETL from RDBMS to Neo4j
I have a mature 50+ tables web application based on mySQL. In order to do some advanced data mining I want to use Neo4j and the goodnes of cypher. However I'm having a hard time migrating my data from ...
1
vote
2answers
195 views
A database in MySQL is a schema in Oracle : I do not understand this statement
Please help me understand this statement:
A database in MySQL is a schema in Oracle.
I have just started to use Oracle and I find it different from other RDBMS softwares I have used like MSSQL, ...
1
vote
3answers
199 views
Which RDBMS has the most advanced “table-valued” functions?
Every Database Management System focuses on specific features and applications. I am using mysql, probably as it is popular and satisfies common needs. However, I came across a problem, which needs ...
2
votes
1answer
121 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;
...
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` ...
10
votes
3answers
395 views
Use MySQL to regularly do multi-way joins on 100+ GB tables?
Background:
I’ve created a web application that I would like to be able to scale reasonably well. I know I'm not Google or Twitter, but my app uses a fairly large amount of data for each user and thus ...
2
votes
3answers
335 views
Which database is best for deeply embedded database or through C DLL?
I want a deeply embedded database. Deeply embedded means that the server is started by an application and closed by the application with no tcp/ip or 0 port. The main features of consideration are:
...
8
votes
2answers
3k views
PostgreSQL vs. MySQL - Advantages / Disadvantages with a spatial component
We are the in the process of building out a web application that has a spatial data component. In the beginning our spatial data comparisons will take a given point and return matched overlapping ...
0
votes
1answer
282 views
which DBMS should i go for? [closed]
I am interested in learning a DBMS. As a beginner which DBMS should i go for ?
I know few DBMS by name like Oracle,Sql Server,My Sql . How are these DBMS different from each other ?
As a beginner ...
5
votes
2answers
492 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 ...
3
votes
3answers
439 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 ...
3
votes
1answer
1k views
Amazon SimpleDB or Amazon RDS?
I'm at a deciding point in my project of whether to implement the database using SimpleDB or Amazon RDS. The database needs to be accessed through an iPhone app and as well through a website. Here are ...
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 ...
5
votes
4answers
999 views
Why are so many MPP solutions based on PostgreSQL instead of MySQL?
Astor Data, Greenplum and GridSQL all allow Massive Parallel Processing of SQL queries. They are also all built around PostgreSQL technology. Is this just because of licensing issues or are there ...
