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16
votes
1answer
594 views

What is the reasoning behind the CAP theorem?

http://en.wikipedia.org/wiki/CAP_theorem http://www.cs.berkeley.edu/~brewer/cs262b-2004/PODC-keynote.pdf I think it is not very straightforward why only two of Consistency Availability Partition ...
6
votes
1answer
584 views

Why can't we perform joins in a distributed database like Bigtable?

From this answer to What database does Google use?, BigTable is not a relational database. It does not support joins nor does it support rich SQL-like queries. Is this obvious? I do not ...
3
votes
2answers
227 views

Database choices for big data

I have many text files, their total size is about 300GB ~ 400GB. They are all in this format key1 value_a key1 value_b key1 value_c key2 value_d key3 value_e .... each line is composed by a key and ...
3
votes
1answer
282 views

DB2 Express-C 10.1 database move to DB2 Work group Server/Enterprise Edition

I have not done such migration before and I want to know if I am going to face such issues when moving my database (tables,views,table-spaces,functions,procedures,etc.) to other DB2 distribution. If ...
3
votes
1answer
164 views

PostgreSQL synchronized commit performance

I'm setting up a pair of PostgreSQL servers. Because cash is short I can only afford one high class server and some crapy backup box. If the expensive high end box should catch fire, operations can ...
3
votes
1answer
136 views

Distribute MySQL in different cities?

We have our main MySQL server in city A. We have the bulk of our customer service staff in city B. The staff are complaining that the connection is too slow to the server. The options are: Have them ...
2
votes
1answer
21 views

Simultaneous money withdrawls from a distributed/replicated database

Lets say I have $10 in my bank account. The database is replicated in North America and Asia. At the exact same time I do a withdrawl of $10 in N. America and in Asia, meaning that my withdraw would ...
2
votes
1answer
283 views

Consistency in ACID and CAP theorem, are they the same?

From my understanding, the consistency in ACID is ensuring the data integrity. However, the consistency in CAP means the data can appear quickly in distributed system. Does that mean: they are not ...
2
votes
1answer
44 views

Need scalable database solution for very big automated data entry database

I've been working on MySQL database in simple web applications for a long time and i now have a project which should maintain about 1,000 up to 10,000 query per minute (it is some logging database ...
2
votes
1answer
705 views

Does the pgpool-II extension allow for parallel execution of any query?

I read about pgpool-II here and it states that: Using the parallel query function, data can be divided among the multiple servers, so that a query can be executed on all the servers concurrently ...
2
votes
0answers
206 views

Upgrading Remote Distributor in SQL Server Replication

I'm upgrading my remote distributor from 2005 to 2008r2, it is performing transactional replication only. this is a prerequisite to completing an upgrade of the Publisher to 2008r2. Script ...
1
vote
1answer
44 views

Designing a fragmentation database? [closed]

I did some research about distributed databases, but I still have some questions. I understand there is something called "fragmentation database" but I can't find any help full document for ...
1
vote
2answers
388 views

Difference between partitioning and fragmentation [closed]

I'm trying to learn something about distributed databases and I stumbled upon the concepts of fragmentation and partitioning. It seems to me as if both do the same thing and produce similar results ...
0
votes
1answer
40 views

Linked SQL Servers

I'm trying to link 2 SQL Servers (2008 and 2005). I have tried it via the GUI and scripts, and having no luck. I have problems trying to to query through it with access. As I'm not the Admin of the ...
0
votes
1answer
477 views

Model for Distributed Database [closed]

I want to design a model for a distributed database solution. Are there appropriate tools and approaches? How to include stereotypes for (horizontal) fragments?
0
votes
2answers
115 views

Alternatives for Dblink in oracle?

we have an SSIS job that inserts data into a table in server A from data in table which is located in some other server B. For this,we are making use of dblinks to connect to other database . But, ...
0
votes
2answers
2k views

Distributed Database Architecture Using MySQL Replication

I've been task to move our web servers to the cloud for all countries that use our services for localization. The issue is, they must share the same data and therefore I need to set up some database ...
0
votes
1answer
334 views

How to install and configure Postgres-XC in windows?

Can anybody suggest me any resources of the complete installation procedure of postgres-XC in windows. I've installed postgresql-9.2 in my windows and can use it. Now I need to know the installation ...
0
votes
3answers
815 views

how to find vertica community edition and how to export / copy data

I have the hardest time downloading anything other than enterprise edition from vertica.com. It is supposed to have a community edition on https://my.vertica.com/community/ but all the links just show ...
0
votes
1answer
59 views

Oracle DB - Is it possible to distribute data of a table onto multiple servers?

BigTable[1]-like systems (HBase[2] for instance) allows a table to be distributed transparently accross multiple servers. This works as follows: Each server perform the read/writes operations on ...
0
votes
1answer
27 views

What are alternatives to Replication to distibute data (Microsoft SQL Server)

Is anyone knowledgeable of alternatives to SQL Server replication? I have a scenario where separate databases will share a lot of the same data which complex queries will match against. We want to ...
0
votes
0answers
41 views

Distribute records on different MySQL databases - MySQL Proxy alternative

My scenario is the following: Right now I am using one big MySQL database with multiple tables to store user data. Many tables contain auto increment columns. I would like to split this into 2 or ...