A widely-used open-source operating system that is particularly popular on servers.

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MySQL: How to avoid case sensitivity in SQL queries when migrate from Windows to Linux?

I have migrated my Database from Windows to Linux server. In many places, query has been written without focusing their cases (uppercase / lowercase). So, these queries are not getting executed and ...
6
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1answer
832 views

high background flush avg mongodb

similar question: High Global Lock % on Mongodb Overview We have a production setup replica set in v2.4.8 mongodb running on five 4-core, 28gb RAM VMs with standard azure datadisk HDDs running on ...
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1answer
577 views

InnoDB engine is not loading after tuning parameters

After installing MySQL-5.1.73, I placed default my-huge.cnf into /etc/my.cnf and started the mysql service. It was running without any issue. Now, I tunned some parameters in /etc/my.cnf file. Below ...
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1answer
711 views

Difference between [mysql] and [mysqld] in MySQL configuration file

There are multiple sections in MySQL configuration file: [mysql] [mysqld] [myisamchk] [mysqld_safe] [mysqlhotcopy] [mysqldump] [client] I found that same variables with different values have ...
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2answers
493 views

How to create and start a PDB for RCU in Oracle 12c

So I've made a fresh install on a virtual machine based on OEL 6.5 x64. All my installs are in /opt/apps I installed a Oracle Database 12c, with the Desktop Version selected (not server), UNICODE ...
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2answers
164 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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1answer
110 views

What does this mean - ~/.my.cnf

When I run $ mysqld --verbose --help | less I got information like Default options are read from the following files in the given order: /etc/mysql/my.cnf /etc/my.cnf ~/.my.cnf As per my ...
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1answer
26 views

Unable to start mysql

I am using Oracle LINUX5. I installed MySQL 5.1.73 community edition through RPM command and it was working. Now, I stop mysql by running below command: $ mysqladmin -u root -ptmpassword shutdown I ...
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1answer
435 views

Report Builder cannot publish to report server

This is currently in a cloud lab environment. We're not allowed to join any AD domains. We have a linux server (RHEL 6) running MySQL 5.3 and a Windows SQL Server 2012 on Win 2k8 R2. Our laptop is ...
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0answers
841 views

MySQL - Out of memory: Kill process 3046 (mysqld)

We run a MySQL (v5.6.17) dump backup every 4 hours, and today noticed: Apr 19 20:09:30 mysql1 kernel: Out of memory: Kill process 3046 (mysqld) score 970 or sacrifice child Apr 19 20:09:30 mysql1 ...
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1answer
527 views

MongoDB on Raspberry Pi --dbpath not setting

I installed MongoDB using this tutorial. I have tried to set --dbpath in /etc/mongodb.conf like this: dbpath=/path/that/iwant #where to log logpath=/var/log/mongodb/mongodb.log logappend=true ...
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1answer
142 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
1k views

Unable to Start PostgreSQL. kernel's SHMMAX parameter exceeded you limit

When I am trying to start my PostgreSQL I get the following error in the Postgresql.log file: FATAL: could not create shared memory segment: Invalid argument DETAIL: Failed system call was ...
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1answer
142 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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2answers
248 views

Make Oracle backup files available for duplicate

I have a Red Hat Enterprise Linux server with Oracle 10.2.0.5 and a database on it (SID is TNATEST). I have a remote CentOS server with Oracle 10.2.0.5 on it that I want to duplicate TNATEST to. The ...
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2answers
202 views

MySQL - prevent OS cache for query

On high load production server I have many sql selects which are unique or re-use will be in hours. I use SQL_NO_CACHE but this queries are still cached with OS cache. Server have 64G ram and used ram ...
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0answers
150 views

Can I set a lower_case_table_names value for a specific database?

I'm running a MySQL 5.5 on Linux (Debian 7) with several databases. I need to import a database originally maintained in Windows MySQL using sqldump. My issue is that this database is used by a ...
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2answers
2k views

Why Can't I find my databases from Mysql on linux?

I'm new to linux. I cannot get a list of my databases by typing SHOW DATABASES on the MySQL shell. Though this MySQL program is aware of the MySQL datadir because it is listed when I type SHOW ...
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1answer
811 views

Postgres memory usage too low

I have a 400GB Postgres 9.3.4 DB running on Fedora20, and a few indices per table. I have upped shared buffers to 4GB (the system has 16GB available), set shm in the kernel and set the ...
0
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1answer
731 views

Using environment variables in data pump query

I have been trying to use data pump (expdp and impdp) in order to retrieve some data from a database to import it into another. I am using the expdp using the table and the query parameters in order ...
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2answers
1k views

Does a MyISAM table locks if I copy it while MySQL is running? (READ DISCLAIMER)

DISCLAIMER: I'm very aware this is not supposed to be done, but time consistency between tables aren't a concert here and Im trying whatever pops in my mind right now to have alternatives for ...
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2answers
318 views

Can CPU cores be separated for MySQL?

Is it possible to separate CPU cores in Mysql? I understand it is possible for Memory as we can tune it in innodb_buffer_pool_size or innodb_additional_mem_pool_size. How about CPU cores in ...
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2answers
1k views

Linux command to kill all MySQL sessions from a specific User?

How can i kill all sessions from a user in mysql using a linux command line command? I have a user that is using all on my database connections and insted of killing one by one i want to make a ...
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3answers
698 views

Move Complete ORACLE from one system to another

I have 2 identical server with exact disk partitions (OS CENTOS 6.4 both ) [My college central oracle server]. Entire ORACLE HOME ( bin , control files, data files everything on oracle) is on 2nd ...
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0answers
198 views

MariaDB : Larger innodb_buffer_pool_size causing SQL updates to be slower

Has anyone here encountered such scenario before where and update statement took longer time to run when innodb_buffer_pool_size is bigger. I've run a few tests using the same statements on around ...
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3answers
392 views

How to use Oracle Installation Prerequisites on Redhat Linux 6.5?

Today I get error below when install Oracle 11gR2 on Redhat Linux 6.5. I follow instruction in this link: http://public-yum.oracle.com/ After I call this command: # yum install ...
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1answer
647 views

Trouble with installing additional modules on Postgresql 9.1 on ALT-Linux

I'm trying to create extension under postgresql 9.1 (Linux): CREATE EXTENSION pg_trgm; but got error: ERROR: could not open extension control file "/usr/share/pgsql/extension/pg_trgm.control": No ...
0
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1answer
577 views

I'm trying to run an oracle database in virtual box under oracle linux

I'm trying to run a oracle DB in VirtualBox and access it from my host mac OSX , i am using port forwarding to access my guest, I can telnet my guest on the port, however when i try to connect from ...
0
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2answers
123 views

MySQL: Moving Database from Windows to Linux

I have a Windows based dedicated server have below configuration: Windows edition: Windows Server 2008 R2 Standard Service Pack 1 Processor: Intel(R) Xeon(R) CPU X5460 @3.16GHZ 3.16 GHZ (2 ...
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1answer
263 views

Heartbeat Options with MySQL and Possibilities

I would like to understand if the following scenarios are possible in Heartbeat in Linux. Setup: Two Database Servers running Mysql in Active/Passive mode in replication mode having Heartbeat setup ...
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2answers
83 views

ORACLE Shifting from from one version to another

I have RHEL5 server with Oracle Home actual location is SAN, which is mounted on this server. Now for few Reasons I have one more Server with RHEL 6 64Bit. I will map those storage LUNS there. What ...
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0answers
59 views

MySQL import low use of resources

I'm importing a largish DB into MySQL (20tables of ~25mill records). As expected this is taking a long time, but I'm curious as to why the process is running using only 0.000 to 0.700 %CPU and 0.87 ...
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1answer
33 views

How can I create DB2 objects with Linux SUDOer authority?

All, I am relatively new to Red hat linux and I have SUDOer authority but unable to create DB2 database or other objects. How can I accomplish this task? Please give examples. Also, is there any ...
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1answer
43 views

Couldn't connect to databasee

I have a dedicated webserver and a dedicated database server Often , i got errors connecting to database server couldn't connect to database Here is my current /etc/my.cnf configuration file ...
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3answers
14k views

How to make MySQL table name case insensitive in Ubuntu?

I am using Ubuntu 13.10 and MySQL 5.6 and I know database name and table name are case sensitive in Ubuntu (and some other *nix environments) by default. Now, I want to make MySQL work as case ...
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1answer
606 views

Oracle silent install on Redhat Linux (The Global database name was left blank.)

I am installing Oracle 11g in silent mode using the response file that is in the database/response directory. It is three response files in that directory(i.e. dbca.rsp, db_install.rsp and netca.rsp). ...
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0answers
396 views

How to set selinux permission for non-standard mysql bin log path?

By default, mysql bin log works in folder /var/log/mysql. but moving to any other share such /mylogs/mysql gives permission error. Below is the exact message: usr/sbin/mysqld: File ...
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3answers
128 views

Reset of root password not working?

Our previous DBA left and didn't note the root password down, and I've been pressganged into doing part of his job until we can hire someone. So I create a file : /root/mysql.password Inside that ...
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0answers
112 views

Does using noatime on modern Linux make sense?

Starting from version 2.6.30 (which was released 5 years ago), Linux has the option relatime enabled by default. It means updates of file access time are very infrequent and prudent. But I still see ...
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0answers
236 views

Huge load on CPU because of mysql process [closed]

I am getting a huge load on my linux servers because of this query. CPU is on 500% load & this query is causing load. /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql ...
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0answers
220 views

MySQL gets slow in Linux server

I'm using a jdbc connection to connect a vaadin application to a MySQL database. It works fine, but after a couple of uses it gets really slow, and even freezes the application to a point I have to ...
2
votes
3answers
6k views

Counting postgres open connections without SQL query or connecting to postgres itself

For a monitoring script I need to count the number of open connections to a postgres database. This is done easily enough by opening up a client connection and running a count on the pg_stat_activity ...
0
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1answer
72 views

Please tell me my data isn't gone… lie to me even

In a moment of ignorance I setup my webserver to auto backup all data to another machine. not a problem except I just mearly cp -R /var/lib/mysql so all I ended up getting was hundreds and hundreds ...
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0answers
2k views

sqlldr: command not found

I have a script which has this command 'sqlldr' which gives me the error sqlldr: command not found when I run this script. I googled and found that people say that this command should be there in my ...
2
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1answer
3k views

Mysql error 28 no space left on the device

I keep running in to the same problem with mysql with error code 28 which means there is not enough space left on the device. Now the weird part is that there is enough space, here are some tips i ...
0
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1answer
149 views

Poor SQL performance with raid10

Maybe I'll try my luck here. Server Fault site was quite hostile for non-professional server user. I recently bought HP ProLiant ML310e Gen8 v2 server with 8G's RAM and 4 HP 1TB 6G 7.2k rpm SATA ...
2
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1answer
2k views

Can I execute an external process via MySQL on table change?

When using triggers, if an update is done to a table then a trigger is executed. This is very convenient. But what I would need is to execute an external script. Is it possible to configure MySQL ...
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0answers
550 views

Postgres Backup on linux server [closed]

I am trying to take backup of postgres from InstallAnyWhere which is installer for linux and windows machine. I am calling pg_dump from Java process builder as command line below cmdLine: ...
5
votes
2answers
6k views

mysql multi threading for a single query

I have big db of size 8GB and having 9 million contacts in this db. When we try to retrieve all contacts, it takes nearly 1 or 2 hour (in some cases result in timeout) to retreive all contacts for the ...