Tagged Questions

11
votes
3answers
2k views

Is the CPU performance relevant for a database server?

This is a purely theoretical question. Let's say I have an application deployed on multiple servers. A load balancer, Multiple/scalable applications servers A (single) database server (for the ...
14
votes
2answers
4k views

Find highest level of a hierarchical field: with vs without CTEs

note: this question has been updated to reflect that we are currently using MySQL, having done so, I would like to see a how much easier it would be if we switched to a CTE-supporting database. I ...
8
votes
3answers
671 views

How is LIKE implemented?

Can anyone explain how the LIKE operator is implemented in current database systems (e.g. MySQL or Postgres)? or point me to some references that explain it? The naive approach would be to inspect ...
3
votes
2answers
629 views

Can I have one table be an “alias”, or “symlink”, to another?

I have two tables with the same structure, A and B. A certain application is written so that it always writes the same data to both tables. After a discussion with a colleague about the potential to ...
1
vote
4answers
138 views

Daily and Differential Backups

Is there a program with which I can create daily MySQL, PostgreSQL and MariaDB backups with these requirements: The first time, make a full backup. The second time, only the changes since the last ...
7
votes
1answer
2k views

How to migrate large blob table from mysql to postgresql?

I'm now in process of migrating my MySQL database to PostgreSQL. Almost everything went fine (well, after lots of googling for correct mysqldump params etc.) except one table I have - actually the ...
6
votes
2answers
594 views

Database for building a realtime analytics system

I want to build a system similar to Google Analytics (only used for internal use, less traffic and less feature), and mainly focus on Real time counting of unique URI visit/PV by different ...
3
votes
2answers
2k views

No NULLs, yet invalid byte sequence for encoding “UTF8”: 0x00

I've spent the last 8 hours trying to import the output of 'mysqldump --compatible=postgresql' into PostgreSQL 8.4.9, and I've read at least 20 different threads here and elesewhere already about this ...
4
votes
3answers
523 views

How can I write a proper query to JOIN all of these tables without duplicates?

Let's say I have four tables: TABLE: players COLUMNS: id, first_name, last_name TABLE: passing_stats COLUMNS: id, year, passing_yards (several other passing columns) TABLE: rushing_stats ...
3
votes
1answer
630 views

Database as a service (DbaaS) over dimensions--performance, scalability, & reliability?

MySql Database as a service: Amazon Xeround Another eg. PostgreSQL Database-as-a-Service. You can get the list of similar products here. Does anyone have details on their performance, ...
1
vote
1answer
425 views

storing a mirror of IMAP/pop3 folder/inbox in a local DB, what choices are there?

I have a email inbox that will soon hit 4 million messages, I have an app that runs different policies over the inbox to associate emails with each other much like the conversation plugin for ...
0
votes
0answers
36 views

Backup daily for MySQL, MariaDB or PostgreSQL [duplicate]

Good day: I wonder if there is a program with which I can create daily backups with these requirements: The first time, make a full backup. The second time, only the changes since the last backup, ...