MariaDB is an open source RDBMS that is designed to be a "drop-in" replacement for MySQL.

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Indexes on XtraDB tables

I have old db with myisam tables, using mariadb and want try move to xtradb for row-level locking. Each table have 27 columns, primary index and other 11 indexes. Columns with indexes have many ...
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mysql/mariadb: ifnull changes collation

It seems that 'ifnull' changes the default collation that is set to be used. I have tried on both mysql and mariadb: Server version: 5.5.34-MariaDB-1~precise-log mariadb.org binary distribution ...
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2answers
314 views

Setting default CHARSET and DB Engine

I recently updated my server's database system from MySQL to MariaDB. After update, everything works well. But, when I went to phpMyAdmin, the default charset and types are changed: At the end of ...
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Purge old records from mysql ibdata1 file

Is it possible to purge old records from an ibdata1 file without taking down the database attached to it? Records that have been deleted from the database are still present when I scan ibdata1 for ...
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1answer
434 views

What are the drawbacks of using Galera Cluster instead of Master/Slave Replication?

What are the drawbacks of using Galera Cluster instead of regular Master/Slave Replication? Galera's 0 slave lag time, Synchronous replication and no Single point of failure seem very appealing then ...
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node unable to join a galera cluster; it fails during state transfer

It looks like the node is joining the cluster and then it fails… I have tried with both rsync and xtrabackup and it fails during state transfer. I seems to me that I am missing something real simple ...
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1answer
75 views

Update old database with SQL dump

I had to recover a database with a some months old full backup. I have however in my possession a most recent but unfortunately incomplete SQL dump for this same database done with mysqldump. Is ...
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196 views

mariadb-galera-server with Aria?

With Galera now somewhat supporting MyISAM replication, does that also mean that it will replicate Aria databases with storage engine (which is more or less feature complete to MyISAM, and a drop in ...
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2answers
285 views

Slow query responce on different mysql versions, percona, MariaDB

LEFT JOIN is supposed to be faster than a NOT IN query. This is what I've read online. But practically, this seems to be opposite. I have the following query here, INSERT IGNORE INTO callrequests ...
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520 views

How to enable the Federated/FederatedX storage engine on MariaDB 5.5?

I upgraded from MySQL 5.1 to MariaDB 5.3 and then to 5.5 on a Windows machine. Everything works well, except I can't enable the federated storage engine. With MySQL 5.1 and MariaDB 5.3, I just added ...
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MySQL - Autoincrement does not increment sequentally if last row was deleted

I have a table which contains an auto incremented primary key id. If I delete the last row (highest id, for exampe id = 6) and insert a new row, the new id starts at 7. Which paramater I have to ...
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2answers
51 views

Indexing a reference column

Say I have a reference table like languages with only 20 records. Is it worth indexing a field like language_code (e.g. en, es) that's frequently used in queries? I'm wondering if an efficient server ...
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962 views

Why should I use InnoDB and MySql instead of XtraDB and MariaDB? [closed]

Why should I use InnoDB and MySql instead of XtraDB and MariaDB, except that InnoDB and Mysql happen to be installed by default on my servers? Why isn't MariaDB and XtraDB installed by default ...
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1answer
307 views

Install MariaDB and MySQL in CentOS 6 32bit in same server

I'm trying to install MariaDB with MySQL in the same server but got this errors: Setting up Install Process Resolving Dependencies --> Running transaction check ---> Package MariaDB-client.i686 ...
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Is RI on a parent XtraDB table maintained after Optimize Table?

$ mysql dbnam -e' optimize table theTable' +----------------+----------+----------+-------------------------------------------------------------------+ | Table | Op | Msg_type | ...
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Can I have a Distributed Database in which one database is MariaDB and the other one is MySQL Cluster?

This is a hypothetical question of course, I just want to know, because that's one of the question i'm going to be asked in my presentation and I have a feeling that the answer is "yes" after all my ...
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2answers
444 views

How do I determine how much data is being written per day through insert, update and delete operations?

The longevity of SSDs is largely determined by the amount of bytes written by insert, update and delete operations. What is the best way to accurately determine how much data is being written by ...
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Best practice for upgrading mysql on a master-master setup

Anyone have experience upgrading a master-master setup of Mysql 5.1 to a release version of Mysql while trying to keep at least one server online (in my case we are upgrading to MariaDB 5.5).
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1answer
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MariaDB Galera Cluster Replication error, no state received?

I have a very minimal, fresh out of the box setup for MariaDB with Galera clustering. My master node of the cluster is able to run, and is reporting that there is only one node attached to the ...
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157 views

MariaDB CUstom Functions

In MySQL, I wrote functions in C++, compiled them as .so, and added them to MySQL. I am trying to find a website that shows an example for doing the same in MariaDB. I cannot find any instructions, ...
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276 views

How do I safely import MySQL data in a directory to a running MariaDB server?

We're integrating another office into ours. That includes some of their data. I have a new installed MariaDB 5.5 server. The data dir = /home/data/MariaDB. I've done a new/fresh install into that ...
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1k views

Which is faster among MySQL Community Server, Percona and MariaDB [closed]

I have a small setup of MySQL Community Server version 5.6 running on KVM based VPS. 4 CPU cores are available and total memory is limited to 1GB. I use MyISAM tables mainly for Wordpress and few ...
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1answer
808 views

MariaDB header error

I had a MySQL server on my Ubuntu dev box (I use a tutorial "how to install a lamp on ubuntu" type of article) and I decided to install mariadb. So I uninstall mysql and install mariadb. ~$ mysql ...
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336 views

Is there a system wide way to change MariaDB to create tables using ROW_FORMAT = DYNAMIC

I've got a 700MB dump file from a mysql database that I was trying to undump into a new install of MariaDB and I got this error ERROR 1118 (42000) at line 7481: Row size too large (> 8126). ...
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To what extent is MariaDB Java client a perfect replacement for MySQL JDBC (Connector/J)?

Premise: I ship a Java application which will make a JDBC connection to a MySQL database. (At the time of this writing it could be 5.1 or 5.5, but hopefully the question and answer don't rely heavily ...
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1k views

Memcached plugin on MariaDB?

I'd like to try new NoSQL feature in MySQL 5.6 but I am using MariaDB 10.0.2 on Debian 6 and don't fancy coming back to MySQL. I'm wondering whether the memcached plugin has been added to MariaDB? ...
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308 views

Why InnoDB ALTER TABLE is so slow? [closed]

The machine has a 4-core hyper-threaded Intel i7 670 @ 2.8GHz, 16G RAM, 8G of which is InnoDB buffer pool. The database resides on Intel SSD disk. DBMS is MariaDB 5.5.30 x64 running under Windows ...
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278 views

UTF8 vs ASCII or custom binary format: high-performance optimization on very big tables

The summary of my question is whether there are advantages, even if minimal, to use ASCII, or even a smaller format designed yet created specifically for the situation, instead of UTF-8 for strings. ...
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3answers
133 views

How can I improve this query?

About a year back I introduced a query which returns a sort of "Customers Also Purchased" data-set. At the time it ran reasonably fast however, as of late it's become very slow, sometimes taking up to ...
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4answers
1k views

Daily and Differential Backups [closed]

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 ...
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2answers
441 views

MySQL Full Text search increase relevance for exact matches?

I have a MySQL database of ~10,000 organisation names that I want to be able to search. I would like to use a full text search because this would enable me to find "institute of doobry" by searching ...
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904 views

SHOW TABLE STATUS very slow on InnoDB

Recently we've been migrating from MyISAM to InnoDB and I understand that MyISAM uses meta information against each table to track information and such - however, the database is about 1.8gb with 1+ ...
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Autoincrement by 2

I use MariaDB 5.5. It increases every auto_increment value by 2. So all my ai cols look like 1 3 5 7 9 ... Where can I change this behaviour? Or might this be a bug?
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3answers
340 views

How can I improve my table design for different types of an entity?

Consider an accounting system as an example. I have an Entity called Client. Client can be of different types, with different fields applicable to different types. I consider creating separate tables ...
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1answer
924 views

MariaDB, Triggers and last_insert_id

I have a situation where I have three tables: sample, sample_name and run (extra columns removed to be only relevant information). CREATE TABLE `sample` ( `sample_id` int unsigned NOT NULL ...
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2answers
889 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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2answers
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how to import mysql system “mysql” database [closed]

This question might be already answered but it's almost impossible to google it. When I perform full backup of mysql server using mysqldump --all-databases then reinstall it from scratch I want to ...
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1answer
160 views

Avoiding performance hit from GROUP BY during FULLTEXT search?

Is there any clever way to avoid the performance hit from using group by during fulltext search? SELECT p.topic_id, min(p.post_id) FROM forum_posts AS p WHERE MATCH (p.post_text) AGAINST ('baby ...
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309 views

Can't connect to local MySQL server through socket '/var/run/mysqld/mysqld.sock' (2)! in Fedora16

I installed MariaDB server in linux using tar file(mariadb-5.5.28a-linux-i686.tar.gz) followed by the instructions from this link : https://kb.askmonty.org/en/installing-mariadb-binary-tarballs/. ...
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496 views

MariaDB allowing select only user to create databases

I'm baffled. I have a select only user, but somehow, the user can create a new database, and create table inside the new database. It can't create tables inside other db. It's really odd. This is ...
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3answers
244 views

mariadb ignoring force index

I'm trying to tune a relatively simple query: select bt.col1,bt.col2 from bigtable bt join smalltable st on bt.smalltable_id = st.smalltable_id where st.name = 'some name occuring only once in st' ...
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1answer
255 views

Does MariaDB-Galera Cluster support LAST_INSERT_ID and mysql_info?

As far as I understand, Galera does not support table locking, but what information can be retrieved about the last query? LOCK/UNLOCK TABLES cannot be supported in master-master replication. Lock ...
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4answers
708 views

TRUNCATE TABLE statement sometimes hangs

Why does the TRUNCATE TABLE statement hang sometimes? What are the reasons for this type of issue? I am migrating from MySQL to MariaDB. This problem doesn't happen with MySQL, only with MariaDB. ...
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1answer
845 views

Error 1046 Mariadb: No database selected

GRANT ALL ON my-database.* TO my-user@10.0.0.1 IDENTIFIED BY 'password'; ERROR 1046 (3D000): No database selected Ok I have created a database with a "-" on the name (did the same thing on the ...
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1answer
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MariaDB and XtraDB/InnoDB plugins

In my vps, I thought of switching from MySQL to MariaDB (using Monty's repository for Debian Squeeze). Copying over my.cnf from MySQL to MariaDB, I saw that the new config file (the one from the ...
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Optimizing MySQL -

I've been researching how to optimize MySQL a bit, but I still have a few questions. MySQL Primer Results http://pastie.org/private/lzjukl8wacxfjbjhge6vw Based on this, the first problem seems to be ...
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3answers
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Is MariaDB a suitable drop in replacement for MySQL on a standard LAMP stack?

I've been wondering lately what (if any) are the improvements available in MariaDB over 'conventional' MySQL? I understand that where platform interoperability and/or backwards compatibility may be ...
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365 views

Should I use mysql_upgrade after mysqld_safe when upgrading MariaDB?

I'm wanting to know the best practice to do a MariaDB upgrade on opensuse. I am getting this error: mysqldump: Couldn't execute 'SHOW FUNCTION STATUS WHERE Db = 'a_database'': Cannot load from ...
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1answer
3k views

Do you still use MyISAM or prefer Aria storage engine?

If Aria storage engine (previously called Maria) is the "new" MyISAM, which supports transaction and automatic crash recovery: Why still use MyISAM ? Should changing storage engine from MyISAM to ...
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2answers
730 views

Is there any performance difference among MariaDB (xtradb plugin) and XtraDB Server for InnoDB?

Title says it all. However i have to enter at least 30 characters.