Ubuntu is a desktop and server operating system based on Debian GNU/Linux. Note that http://askubuntu.com is specifically dedicated to Ubuntu questions.

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I have accidently deleted ibdata1 on an ubuntu server

I have accidently deleted the 'ibdata1' file on the server having innodb, Is there any way I can recover it? the mysql service has restarted since the deletion.
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132 views

Should my Postgres backup server be as beefy (IO, processor, RAM) as my master?

I've set up a Postgres database on a server with 2 CPU cores, 4GB of RAM and an SSD volume (on top of RAID 10 of course). This is our (sort-of) "beefy" production database server (I can easily add ...
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4answers
4k views

How to change the data directory on Postgresql 9.1 on Ubuntu

I am having a problem changing the data directory on postgresql 9.1 on ubuntu 13.04: I first did a: sudo pg_dropcluster --stop 9.1 main and then attempted to create a new one in the desired path: ...
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1answer
2k views

restore compressed dump query in postgresql asks password

I'm using ubuntu OS and I took backup using sudo -u postgres pg_dump dbname | gzip > filename.gz in the file path as... /home/administrator/Documents/DB_Backup# sudo -u postgres pg_dump dbname ...
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1answer
216 views

What happens to existing MySQL databases when I upgrade my Ubuntu distro?

I am in the midst of upgrading my Ubuntu distro from 10.4 to 12.4. Fearfully, it asked me for root password on MySQL when I was upgrading the distro. I used to have databases on that server, would ...
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3answers
3k views

Installing Oracle 11g on Ubuntu 11.10

Does anyone know to how to install Oracle 11g on Ubuntu 11.10?
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1answer
94 views

Safely changing innodb_buffer_pool_size on MySQL replication master?

We have a MySQL server which is a replication master. We need to change the innodb_buffer_pool_size and innodb_flush_method to (hopefully) improve performance as the database has grown. What is the ...
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2answers
388 views

MySQL Synchronous Replication on Ubuntu 12.04 with DRBD

I have been looking around for some easy and open-source ways to handle database synchronous replication. DRDB on a Linux server seems to be one of the fastest and easiest methods to handle database ...
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3answers
1k views

Ubuntu: upgrading postgresql 8.4 database cluster for use with 9.2 server

I have installed PG 9.2 on my machine. I have a database cluster that was created about a year ago, using initdb, using postgreSQL version 8.4. The (8.4) data cluster consumes several Gb and so its ...
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1answer
1k views

Postgresql: what to do about upgrading “main” cluster from 8.4 to 9.1 when a 9.1 “main” already exists?

I have an existing 8.4 cluster (named main) that I want to upgrade to 9.1. However, when I go to upgrade it, I get an error because 9.1 already has a cluster named main (apparently a default cluster ...
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2answers
114 views

Trying to create PostGIS database

I am trying to create a spatially enabled PostGIS database by following the PostGIS documentation. In the short version, i executed, createdb yourdatabase createlang plpgsql yourdatabase But I did ...
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1answer
4k views

How to set a specific directory location for individual MySQL database?

Is it possible to set each database in MySQL to use a separate datadir? I'm running a userdir development (sandbox) server and would like to put the MySQL data files for the database(s) for that user ...
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2answers
447 views

Moving MySQL database from UniServer to Ubuntu Server?

I have set up Ubuntu Server 11.10, and plan to host my website on it. Until this point I was using UniServer to host it in a portable fashion. Using the built in MySQL. This is fine, and through ...
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1answer
38 views

Postgresql connection refused

I'm trying to remotely connect to my postgresql database. I have two virtual machines set up both running ubuntu 14.04. I am trying to connect to the second vm using the first vm using psql -h ...
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1answer
116 views

Difference between mongod and mongodb upstart jobs

I just noticed that there are two possible ways to start mongodb: service mongodb start (uses /etc/mongod.conf) service mongod start (uses /etc/mongodb.conf) Can someone tell me what's the ...
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1answer
172 views

Problems installing Postgis extension on Ubuntu 14.04

I have Ubuntu 14.04 with Postgres 9.3 and I'm trying to install Postgis extension. One of the most recommended and straightforward ways I found is very simple: sudo apt-get install postgresql-contrib ...
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1answer
95 views

Easiest way of shutting down a PostgreSQL server on Ubuntu

According to pg_lsclusters I have 2 servers running on Ubuntu 14.04: Ver Cluster Port Status Owner Data directory Log file 9.1 main 5432 online postgres ...
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1answer
1k views

Authentification failure for PostgreSQL server (9.3)

I can currently not connect to my Postgresql server (9.3) from pgadmin (Running on Ubuntu 14.04). The server according to pg_lsclusters is on port 5433. Ver Cluster Port Status Owner Data ...
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1answer
49 views

Which version of linux OS has support for MongoDB installation?

I would like to learn how to install MongoDB in my Windows machine. Currently I have a Windows 8 64 bit OS laptop and I installed MongoDB 64 version for Windows. My question is: which version of ...
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1answer
95 views

Authenticating to Oracle REST data services as admin

i'm working on an android app connected to a database, the database has more data than any tablet can handle, so after some research i found many solutions, most of them consisted of implementing a ...
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2answers
141 views

Questions since MySQL Startup

Have a weird question / (bug?) here. Using PHP My Admin I installed via apt-get on Ubuntu 13.10 Versions are as follows: Server version: 5.5.35-0ubuntu0.13.10.2 - (Ubuntu) Apache/2.4.6 (Ubuntu) ...
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2answers
218 views

Install MySQL on Ubuntu 12.0.4

This is my first time using Linux. I am trying to install MySQL 5.6.15 on an Ubuntu box. I download MySQL from their website and put it on a USB stick then plugged the stick into the box. How can I ...
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2answers
605 views

Can't restore mysqldump database backup in Ubuntu 12.04

I'm trying to restore a database backup created using mysqldump. If I do: $ mysqldump -u ROOT -p DATABASE_NAME < DATABASE.SQL the database remains empty, even though I get some screen output ...
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1answer
535 views

db2 LUW help for an oracle user : create database hangs without any output, but database got created

I am new to db2 but have worked on oracle before. Trying to create a database and it succeeds, but the session where I issued a database creation command hangs. I have installed db2 10.5 on a 64 bit ...
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1answer
2k views

Merge multiple tables in a database

I have a MySQL database with table names like 1,2,3... upto 1000 Each tables have 2000 rows and has the same structure. This is how all my 2000 table's structure look like id,url,title,content id ...
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2answers
493 views

MySQL+Web-App Performance Issues using different servers

We are having a performance issue with our MySQL servers that does not make any sense. I have read countless articles from many people (mostly Percona) and have made my.cnf tweaks. We have even manage ...
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1answer
3k views

MySQL my.cnf Optimization

We are an email marketing company and we recently switched our setup to MySQL. We need to configure MySQL (my.cnf) for extreme performance. We have tried to configure my.cnf but heavy queries got ...
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3answers
1k views

Ubuntu / MySQL / Percona XtraBackup gives error “sh: 1: xtrabackup_55: not found”

Hello I installed Ubuntu 12.04.2 LTS on a fresh box. This installed MySQL 5.5.29. I installed percona-xtrabackup-2.0.6-521.tar.gz, and moved the executables to /usr/bin/ But innobackupex is ...
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1answer
134 views

clusterdb stopped working for PostgreSQL database in Ubuntu 12.04 server

After a fresh PostgreSQL install (version 9.2) on my Ubuntu server 12.04, clusterdb utility stopped working. I used the same config files as I used with version 9.1. Below is the actual command: ...
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1answer
41 views

Warnings while running AutoMysqlBackup

I am using Automysqlbackup.sh file to take MySql backups on Ubuntu.I have only 1 database. But when i run this script then it generates several Warnings (plus a error mail) like below Errors reported ...
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0answers
25 views

MySQL Memory & max_connections Performance Tuning

So, our site runs WordPress and in the past few days we have been getting tons of spam comments etc. I believe that we are becoming the victims of some kind of bot army that has been crashing our ...
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2answers
746 views

Redis takes up all the Memory and Crashes

A redis server v2.8.4 is running on a Ubuntu 14.04 VPS with 8 GB RAM and 16 GB swap space (on SSDs). However htop shows that redis alone is taking up 22.4 G of memory! redis-server eventually crashed ...
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0answers
136 views

MongoDB Replica Set: Can't Add Member/Connect

I'm building a MongoDB replicaset w/ three Ubuntu 14 servers. I'm connected to the primary server and authenticated w/ userAdminAnyDatabase and clusterAdmin privileges. When I run ...
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1answer
92 views

Mongodb replica sets: why does my master server occupy more disk space than my slave?

I have two servers on my replica set. Let's call it the master and the slave, for the purpose of this discussion. The master was the original one, and the slave was replicated from that master. At ...
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0answers
143 views

how do I debug postgresql 9.1 server terminating

my /var/log/postgresql/postgresql-9.1-main.log shows 2014-03-25 10:39:30 CET HINT: In a moment you should be able to reconnect to the database and repeat your command. 2014-03-25 10:39:30 CET LOG: ...
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0answers
490 views

PostgreSQL problems on Ubuntu 12.04

I'm having terrible problems with PostgreSQL initialization on my VPS. I followed several tutorials on this topic and nothing made my database server work. I followed these steps: sudo apt-get ...
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1answer
91 views

MySQL on Ubuntu 32bits vs 64bits

My web app server is running on Ubuntu 12.04 server 32bits. The mysql db is going to be installed on a different Ubuntu 12.04 server. Should I use 32 bits for the server on which mysql is or 64 bits? ...
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2answers
911 views

pgpool replication not allowing md5 authentication

I have installed both pgpool and postgresql via apt. In pgpool.conf, I have made the changes necessary to use replication mode, as well as my two postgresql databases (currently all running on the ...
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0answers
43 views

Pg_restore table size differences

What would account for the difference in table sizes between one PostgreSQL database and another restored from its dump file? On an Ubuntu 12.04 host, I'm running PostgreSQL 9.1, and I dumped my ...
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3answers
867 views

Issues installing MySQL server on Ubuntu 13.04

I'm currently trying to install a MySQL server on my Ubuntu 13.04 machine. The problem is, when I try to install it, I get error messages indicating that not all packages could be downloaded. When I ...
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1answer
2k views

Moving postgresql data directory

I moved postgresql's data directory by following the following steps: Stop postgres cp -a source_data_directory destination_data_directory export PGDATA=destination_data_directory Changing data ...
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2answers
1k views

Install MariaDB without password prompt in Ubuntu

I need to install MariaDB server in Ubuntu without password prompt. For this purpose, I execute the following commands, but it doesn't gave me any progress. It again shows password prompt. I used the ...
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0answers
87 views

MySQL replication backup

How to take MySQL Master-Master and Master-Slave replication backup?. I have setup Master-Master replication with a separate slave for each master on Ubuntu. What happens if, I issue or schedule ...
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0answers
802 views

Why can I not start mysql server on ubuntu after change the innodb_flush_log_at_trx_commit value to be 2?

Why can I not start mysql server on ubuntu after change the innodb_flush_log_at_trx_commit value to be 2 ? updated to answer the 3 questions: mysql> show variables like 'version%'; ...
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2answers
2k views

How do I allow remote mysql access to all users?

I have setup a mysql server on unbuntu. The server hosts websites for my various clients. Hence, I want all of them(and any new clients) to have remote access to the mysql server. How do I configure ...
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3answers
2k views

How do I install postgresql in Ubuntu?

I'm following these instructions, however I can only get to step 17.2. Despite installing postgresql successfully via the sudo apt-get install postgresql command, upon running initdb -D ...
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1answer
218 views

MongoDB shell version error (Server has startup warnings)

I installed MongoDB under Ubuntu server and when inter to MongoDB shell i got this error and warnings. MongoDB shell version: 2.4.7 connecting to: test Server has startup warnings: Sun Oct 27 ...
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1answer
28 views

After upgrade from 9.1 to 9.3, commands still point to 9.1

Upgraded from 9.1 to 9.3 on my Ubuntu 12.04 server. Everything worked great but running commands like 'createdb' still runs them from the 9.1 path. /usr/lib/postgresql/9.1/bin/createdb: unrecognized ...
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1answer
114 views

Upgrading MariaDB Galera cluster from 5.5 to 10.0 - rolling upgrade possible?

I've had a good search around and cannot find much on the topic. We want to upgrade our live MariaDB 5.5 Galera cluster to the MariaDB 10.0 branch, ideally without any downtime. We installed ...
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1answer
267 views

changed password for postgres login in pgAdmin, now can't connect to server

I was trying to use pg_dump to script out a database and in the process I used pgAdmin to change the password for the postgres user. I realize (now) that changing that password was a bad idea. But now ...