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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How do I alter my role to be a superuser?

I'm working my way through the steps in this slide to configure Postgresql & PostGIS. I configured my user role as directed on this slide. Note, the new role should not be a superuser. That ...
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2answers
36 views

How to Permanently solve MySQL error 2002 (HY000)

I have a problem on my cloud server with 2GB of RAM and 40GB Hard Disk that's hosting a Wordpress website that receives around 1000-2000 hits a day. My problem is that MySQL is always crashing and my ...
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12 views

MySQL by default autostarts on Ubuntu Linux?

I installed MySQL server on Ubuntu Linux 14.04 LTS following instructions at https://www.digitalocean.com/community/tutorials/how-to-install-linux-apache-mysql-php-lamp-stack-on-ubuntu. The console ...
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77 views

Galera: WSREP: gcs connect failed: Socket type not supported

I am having a problem when trying to start the 2nd and 3th nodes. The node number 1 has started ok with no problem: I use the same configuration file for galena.cnf and my.cnf : change the ...
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16 views

Should I install hadoop on a single node

I just bought a desktop computer with 16GB RAM and 1TB drive, i7-quad core. I will be partitioning off 800GB for Ubuntu so I can do some data science type tasks. Is there any advantage to installing ...
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1answer
40 views

Why MySQL imports only one record for each table?

Code shows some info: $ cat /etc/*-release | grep VERSION 6:VERSION="12.04.5 LTS, Precise Pangolin" $ mysql --version mysql Ver 14.14 Distrib 5.5.40, for debian-linux-gnu (x86_64) using readline ...
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1answer
33 views

postgresql: accept subdomain wildcards?

I want to accept all db connections from servers with domain mydomain.com so that all subdomains like tiger.mydomain.com, venus.mydomain.com will have access to the postgresql server. I've read that ...
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1answer
84 views

odbc connection from windows machine to mysql server running on ubuntu?

I was able to install mysql server on an ubuntu machine and set up a test data base, created a user and granted that user access to the database. I also changed the binding address to the IP of the ...
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61 views

Are A or D series VMs better for deploying PostgreSQL on Azure?

In Azure there are VMs that have local storage either as spinning disk (A-series) or SSD (D-series). Considering this space is wiped on reboot... Is there a benefit to choosing the SSD option for ...
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1answer
51 views

ubuntu - Pm2 mysql high cpu usage

Not sure what is going on here but would love some help if any can. I am running on digital ocean 1GB ram ubuntu server a node.js application that is is launched with pm2 and that uses a mysql ...
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3answers
66 views

How i can export just structure of mysql database

I use ubuntu 14.10 Phpmyadmin I have ''big'' mysql database, 900mb, I need just structure of this database, how i can export just database structure/empty database without remove data or download ...
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1answer
119 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
346 views

Error: /var/lib/postgresql/9.3/main is not accessible or does not exist

I have a PostgreSQL db that was running on my server. I tried to do a db_dump and got a weird error message. I eventually thought I would just restart PostgreSQL. However its now stopped and won't ...
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0answers
41 views

MySQL performance_schema not working properly?

I have MySQL 5.6.19 community server running on my Ubuntu 14.04. Lately I have been trying to monitor MySQL server using performance_schema. Previously I used to do this by running SHOW FULL ...
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1answer
265 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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1answer
264 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
430 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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0answers
60 views

Pre requirements missing when installing oracle database 11g Ubuntu

I'm trying to install Oracle Database 11g on Ubuntu 14.04. At the middle of executing ./runInstaller I'm getting following message saying about missing prerequisites. This says make is missing but, ...
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38 views

mysqldump replace option - ubuntu / mediawiki

I know this is probably a silly question, but I'd like to be sure, rather than make assumptions. There's the option to use 'replace' in a mysqldump, which uses the 'REPLACE' rather than the 'INSERT' ...
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0answers
35 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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1answer
107 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
3k views

oracle 11gR2 installation on ubuntu 14.04 LTS

I have installed oracle 11gR2 on ubuntu 14.04 LTS. On terminal I wrote following to start oracle: sudo service oracle-xe start on pressing enter, got following output : " Starting Oracle Net ...
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1answer
340 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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2answers
323 views

starting pgbouncer on startup

I installed pgbouncer and configured it and it starts only via using this command pgbouncer /etc/pgbouncer/pgbouncer.ini however using service pgbouncer start it dose not start. I then set up ...
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2answers
2k 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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2answers
5k 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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1answer
134 views

Very large btree index with few rows (openstreetmap gis data)

I tried to import a subset of open street map data to a Postgres database using the standard tool (osm2pgsql). I then tried to rebuild the indices on the table using plain sql (dropping them, then ...
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111 views

MySQL 5.5, Xubuntu 14.04 - INSERT and UPDATE bottleneck

DBAs: I have been developing and maintaining plugins for Moodle for the last ~2 years, and have recently decided to try using my local desktop again, rather than my institutions ESX VMs, as a ...
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1answer
1k views

Good configuration for 2gb (my.cnf) [duplicate]

I'm little newbie in configuring mysql and i seek a good configuration for mysql i have one site in ajax with many query and very slowly with VPS Iam in kimsufi 2gb i run only mysql in vps not apache ...
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34 views

Optimization mysql very slowly [duplicate]

Hello I have a server in kimsufi 2gb RAM and 500gb storage but the query with php mysql is very slowly I have change innodb buffer pool size to 500M but i have error too many connections, i add max ...
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47 views

Starting up postgres on Ubuntu for the first time

I've installed postgres on ubuntu, created a node and now I'm trying to start up that node as per the instructions: postgres --coordinator -D /usr/local/pgsql/data -p 1281 But I get the following ...
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1answer
186 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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280 views

mysql service failed to start when datadir changein ubuntu

I have dual Operating system on PC, windows 8 and ubuntu 14.0, and I am mostely using ubuntu because my MySql database is hosted on ubuntu. Recently when I am trying to restore my database, which is ...
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0answers
341 views

huge size of /var/lib/postgresql/9.3/main/base/1 directory (postgresql)

i'm using postgresql 9.3.4 and real size of database is about 5.5 GB but POSTGRESQL fill disk about 256 GB !! is this POSTGRESQL Cache and what is method to clean thing issue ?
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1answer
602 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 ...
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0answers
282 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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0answers
83 views

listen_addresses set to '*' in postgresql.conf disappears every reboot of Ubuntu

I have set listen_addresses to '*' in /etc/postgresql/9.1/main/postgresql.conf and stopped/started Postgres 9.1 with /etc/init.d/postgresql to "reload" configs. This works fine and I can access my ...
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1answer
203 views

Mysql can't write to filesystem

I need to output some queries as csv files. The directory is in the webroot and I want it to be writable by apache too, so I'm trying to add mysql to the www-data group (on Ubuntu). I thought this ...
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1answer
414 views

MySQL queries are 10 to 100 times slower after OS reboot

I have a MySQL server running on Ubuntu. If I restart the MySQL, everything is fine. If I however restart the OS, my queries take anywhere from 10 times to 100 times as long. The only "solution" to ...
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1answer
125 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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0answers
2k views

Setting password for 9.3 PostgreSQL server

I currently have a 9.3 server running (on Ubuntu 14.04) with "trust" set as the authentification method in pg_hba.conf. How can I set the password again. In pgadmin the server currently doesn't allow ...
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1answer
2k 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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2answers
1k views

Difficulty with Postgis extension on Ubuntu 14.04

I have a updated Ubuntu 14.04 running postgresql 9.3 (installed using the tutorial from https://wiki.postgresql.org/wiki/Apt). When I access my database through pgadmin and go to the console and ...
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1answer
807 views

How to resolve “Error log file size is increasing in mysql 5.5” issue w/o restarting mysql

I have an Ubuntu server with MySQL 5.5 installed. In /var/lib/mysql a .err file is kept on updating with these warnings only: [Warning] IP address '234.22.11.221' could not be resolved: Temporary ...
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1answer
102 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
487 views

TokuDB fails to load in MariaDB, even when transparent hugepages are disabled

Earlier, I upgraded my website server to Ubuntu 14.04 LTS. I had a very nice setup with MariaDB and the TokuDB engine. However, the setup was kind of messed up when TokuDB refused to load properly, ...
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44 views

Connecting to a remote Postgres 9.1 DB

I am running Postgres 9.1 on Ubuntu. I have host all all my.ip.address/32 md5 set in pg_hba.conf and listen_addresses= '*' set in postgresql.conf. Running show listen_addresses shows '*' Running sudo ...
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1answer
107 views

MySQL ran out of space, now won't start

So the partition MySQL was mounted on ran out of space. As a quick fix, I decided to move mysql's data directory to /home/minecraft/mysql/. I then changed the datadir in the config to the correcy ...
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4answers
2k views

PostgreSQL 9.3 on Ubuntu Server 12.04 v.s. MS SQL Server 2008 R2 on Windows 7 Ultima

I have searched many articles in Google about the performance of PostgreSQL vs MS SQL 2008 R2 and found that many of those articles say the performance of PostgreSQL is better than that of MSSQL 2008 ...
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1answer
65 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 ...